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  • AERODYNAMICS  (2,126)
  • Seismology
  • FLUID MECHANICS AND HEAT TRANSFER
  • 42.75
  • 1975-1979  (3,418)
  • 1950-1954  (88)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Eine Verbesserung von Alsops Methode zur Bestimmung der Reflexions- und Transmissionskoeffizienten von Oberflächenwellen (1979)
    Springer
    Pure and applied geophysics 117 (1979), S. 1045-1049 
    Details
    ISSN: 1420-9136
    Keywords: Seismology ; Surface waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary Alsop's method (1966) for the non-normal passage of surface waves through a vertical discontinuity is improved by using a new functional to be made stationary on the plane of discontinuity. The modified functional has the dimension of an energy flux and is characterized by the discontinuous surface wave displacements and stresses on the vertical discontinuity. Model calculations which were carried out for SV-waves and Love waves show that the new version of Alsop's method yields in all respects more consistent results than the old one.
    Notes: Zusammenfassung Die Methode von Alsop (1966) für den Durchgang von schräg einfallenden Oberflächenwellen durch eine vertikale Diskontinuität wird durch Verwendung eines neuen Funktionals, das auf der Diskontinuitätsfläche stationär sein soll, verbessert Das modifizierte Funktional hat die Dimension eines Energieflusses und wird durch diejenige Spannungs- und Verschiebungsdiskontinuität charakterisiert, die durch das Oberflächenwellenfeld auf der Diskontinuitätsfläche erzeugt wird. Modellrechnungen für SV-Wellen und Lovewellen zeigen, daß die neue Version von Alsoos Verfahren in jeder Hinsicht konsistentere Ergebnisse als die bisherige liefert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876084
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Are foreshocks distinctive? Evidence from the 1966 Parkfield and the 1975 Oroville, California sequences (1979)
    In:  Bull. Seism. Soc. Am., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 69, no. 4, pp. 1027-1038, pp. L09611
    Details
    Publication Date: 1979
    Keywords: Fore-shocks ; Earthquake ; Discrimination ; Earthquake precursor: prediction research ; Spectrum ; Corner frequency ; Seismology ; Body waves ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Subduction of the Nazca plate beneath Peru: Evidence from spatial distribution of earthquakes (1979)
    In:  Geophys. J. R. astr. Soc., Warszawa, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 57, no. 1, pp. 537-555, pp. 2121
    Details
    Publication Date: 1979
    Keywords: Subduction zone ; Seismicity ; Seismology ; South ; America ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Attenuation of P and S waves diffracted around the core (1979)
    In:  Geophys. J. R. astr. Soc., London, Elsevier, vol. 57, no. 8, pp. 353-379, pp. 2083, (ISBN 1-86239-117-3)
    Details
    Publication Date: 1979
    Keywords: earth mantle ; Seismology ; P-waves ; Shear waves ; Q-structure ; Quality factor ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    P and S waves diffracted around the core and the velocity structure at the base of the mantle (1979)
    In:  Geophys. J. R. astr. Soc., London, Elsevier, vol. 57, no. 8, pp. 381-395, pp. 2083, (ISBN 1-86239-117-3)
    Details
    Publication Date: 1979
    Keywords: earth mantle ; Seismology ; P-waves ; Shear waves ; Q-structure ; Quality factor ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    New Zealand and Antarctic seismology (1979)
    In:  Earthquake Information Bulletin, Münster, Amer. Sc., vol. 11, no. 4, pp. 170-174, pp. 1228, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Review article ; Project report/description
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    A moment magnitude scale (1979)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 84, no. 7055, pp. 2348-2350, pp. B05S07, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Magnitude ; Source parameters ; seismic Moment ; Statistical investigations ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    A semi-empirical approach to prediction of long-period ground motions from great earthquakes (1979)
    In:  Bull. Seism. Soc. Am., Amsterdam, Elsevier Scientific Publishing Company, vol. 69, no. 2, pp. 1645-1670, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Strong motions ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 9
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    A review of the 1356 Basel earthquake: Basic data (1979)
    In:  Tectonophys., Bonn, 3-4, vol. 53, no. 10, pp. 325-333, pp. L10306, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Earthquake
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    The deep structure of the continents (1979)
    In:  Sci. Am., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 240 , no. 1, pp. 92-107, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Earth model, also for more shallow analyses ! ; Lithosphere ; earth mantle ; SciAm
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    BIBLIOGRAPHY SEISMOLOGY
  • 11
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    A modified form of the Gutenberg-Richter magnitude-frequency relation (1979)
    In:  Bull. Seism. Soc. Am., Kunming, China, 4, vol. 69, no. 4, pp. 1209-1214, pp. L13613, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Magnitude ; Seismology ; Seismicity ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 12
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    Magnitude corrections for attenuation in the upper mantle (1979)
    In:  Geophys. J. R. astr. Soc., Zagreb, 3-4, vol. 57, no. 1, pp. 609-638, pp. B06305, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Attenuation ; Inelastic ; Magnitude ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 13
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    Shear velocity structure in the eastern United States from the inversion of surface-wave group and phase velocities (1979)
    In:  Bull. Seism. Soc. Am., Luxembourg, Conseil de l'Europe, vol. 69, no. 1, pp. 1133-1148, pp. L09610, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Shear waves ; Surface waves ; Phase velocity ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 14
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    Seismic source theory (1979)
    In:  Rev. Geophys. Space Phys., San Francisco, Schweizerbart'sche Verlagsbuchhandlung, vol. 17, no. B10, pp. 328-336, pp. B10404, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1979
    Keywords: Source ; Seismology ; Review article
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  • 15
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    Structure under Mount Rainier, Washington, inferred from teleseismic body waves (1979)
    In:  J. Geophys. Res., Basel, Elsevier Science Publishers, vol. 84, no. B9, pp. 4749-4762, pp. L15S20, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Teleseismic events ; Seismology ; Volcanology ; Velocity depth profile ; USA ; Geol. aspects ; Body waves ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 16
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    Comment on "Dispersion function computations for unlimited frequency values" by Anas Abo Zena (1979)
    In:  Geophys. J. R. astr. Soc., Hannover, Conseil de l'Europe, vol. 59, no. 1, pp. 315-323, pp. L24314, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Dispersion ; Frequency ; Seismology ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 17
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    Observations of sPn from Swabian Alb earthquakes at the GRF-Array (1979)
    In:  J. Geophys., Würzburg, Physica-Verlag, vol. 45, no. 1, pp. 337-340, pp. L24313, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: P-waves ; Seismic arrays ; Seismology ; ConvolutionR
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    BIBLIOGRAPHY SEISMOLOGY
  • 18
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    On the relation between seismic moment and stress drop in the presence of stress and strength heterogeneity (1979)
    In:  J. Geophys. Res., San Francisco, Pergamon, vol. 84, no. B5, pp. 2243-2250, pp. B05315, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: seismic Moment ; Stress drop ; Stress ; Strength ; Seismology ; Modelling ; Source parameters ; Inhomogeneity ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 19
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    Magnitude corrections for attenuation in the upper mantle (1979)
    In:  Geophys. J. R. astr. Soc., Zagreb, 3-4, vol. 57, no. 5372, pp. 609-638, pp. B06305, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Attenuation ; Magnitude ; Nuclear explosion ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 20
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    Studies of seismicity and selected focal mechanisms in Switzerland (1979)
    In:  Schweiz. mineral. petrogr. Mitt., Bonn, 3-4, vol. 59, no. 10, pp. 127-132, pp. L10306, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismicity ; Seismology ; Fault plane solution, focal mechanism ; Muller
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    BIBLIOGRAPHY SEISMOLOGY
  • 21
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    Observations relevant to seismic driving stress, stress drop, and efficiency (1979)
    In:  J. Geophys. Res., New York, August, vol. 84, no. 3-4, pp. 2251-2261, pp. 1610, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Stress ; Stress drop ; Energy (of earthquakes) ; Source parameters ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 22
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    An integral equation for dynamic elastic response of an isolated 3-D crack (1979)
    In:  Wave Motion, Tulsa, 3-4, vol. 1, no. 13, pp. 187-192, pp. B10303, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1979
    Keywords: Dislocation ; cracks and fractures (.NE. fracturing) ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 23
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    Aleutian subduction zone seismicity, volcano-trench separation, and their relation to great thrust-type earthquakes (1979)
    In:  J. Geophys. Res., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 84, no. 5, pp. 4583-4591, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1979
    Keywords: Subduction zone ; Seismology ; Seismicity ; Volcanology ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 24
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    On the relation between Modified Mercalli intensity and body-wave magnitude (1979)
    In:  Bull. Seism. Soc. Am., Dordrecht, Martinus Nijhoff Publishers, vol. 69, no. 3, pp. 893-909, pp. L11307, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Intensity ; Magnitude ; BSSA ; body wave Magnitude
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    BIBLIOGRAPHY SEISMOLOGY
  • 25
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    On the observability of isotropic seismic sources: the July 31, 1970 Colombian earthquake (1979)
    In:  Phys. Earth Plan. Interiors, Kyoto, AGU, vol. 18, no. B1, pp. 176-196, pp. L24302, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Earthquake ; PEPI
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    BIBLIOGRAPHY SEISMOLOGY
  • 26
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    An in situ velocity study: the Stone Canyon well (1979)
    In:  J. Geophys. Res., Berlin, Pergamon, vol. 84, no. B2, pp. 672-678, pp. B04306, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Velocity ; Seismology ; Earthquake precursor: prediction research ; Earthquake precursor: Vp/Vs anomalies ; JGR ; Body waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 27
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    Seismic signal detection and parameter estimation (1979)
    In:  Geophys. Prosp., Luxembourg, Conseil de l'Europe, vol. 27, no. 1, pp. 1-15, pp. 1068, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Detectors ; Seismology ; Statistical investigations ; CoherencyE
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    BIBLIOGRAPHY SEISMOLOGY
  • 28
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    Elastic Waves in the Earth (1979)
    Elsevier
    In:  Amsterdam, 490 pp., Elsevier, vol. 11, no. Publ. No. 12, pp. 127, (3-540-43395-3)
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    Publication Date: 1979
    Keywords: Seismology ; Textbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 29
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    Dispersion function computations for unlimited frequency values (1979)
    In:  Geophys. J., vol. 58, no. B11, pp. 91-105
    Details
    Publication Date: 1979
    Keywords: Seismology ; Layers ; Dispersion ; Frequency ; Synthetic seismograms
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    BIBLIOGRAPHY SEISMOLOGY
  • 30
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    Determination of geometric and dynamic focal parameters for some strong intermediate earthquakes in the Vrancea region (1979)
    In:  Rev. Roum. Géol., Géophys. et Géogr. - Géophysique, Münster, 3, vol. 23, no. 3-4, pp. 39-49, pp. L12311, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1979
    Keywords: Source parameters ; Seismology ; EUROPROBE (Geol. and Geophys. in eastern Europe)
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  • 31
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    Travel time inversion: A geometrical approach (1979)
    In:  J. Geophys. Res., Berlin, Inst. Electrical & Electronics Engineers, vol. 84, no. 4, pp. 3615-3622, pp. B04307, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1979
    Keywords: Travel time ; Inversion ; Data analysis / ~ processing ; Seismics (controlled source seismology) ; Seismology ; JGR
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  • 32
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    Instantaneous power spectra (1979)
    Naval Ocean Systems Center
    In:  report, San Diego, Naval Ocean Systems Center, vol. 1, no. paper SPWLA 90-C, pp. M1-M4, (ISBN 3-933346-037)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Seismics (controlled source seismology) ; Power spectrum ; Spectrum
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  • 33
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    Spektralanalyse seismischer Wellen zur Beschreibung des Scherbruches bei den Erdbeben in Friaul (1979)
    Inst. f. Geophys., Univ. Stuttgart
    In:  Diplomarbeit, Granada, 10-12 June 1999, Inst. f. Geophys., Univ. Stuttgart, vol. 339-350, no. 32, pp. 103-108, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Spectral analysis ; Spectrum ; Earthquake ; Seismology ; Fracture
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  • 34
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    Numerical modeling of transient wave fields in seismology and seismic prospecting (1979)
    In:  Preprint, Novosibirsk, Air Force Geophysics Laboratory, no. AFGL-TR-87-0230, pp. 103-155
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    Publication Date: 1979
    Keywords: Modelling ; Seismology ; Seismics (controlled source seismology) ; Wave propagation
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  • 35
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    Dynamic Green's functions for layered media and application to boundary-value problem (1979)
    Univ. Calif.
    In:  Ph.D. Thesis, San Diego, Univ. Calif., vol. 11, no. PEER Utilities Pgm. Rep. 2000/17, 24 pp., pp. 207
    Details
    Publication Date: 1979
    Keywords: Modelling ; Layers ; Synthetic seismograms ; Seismology
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  • 36
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    Geologische Erdbebenphänomene im Gefolge von Nuklear- und Molecularexplosionen (1979)
    Forschungsinstitut für militärische Bautechnik
    In:  report, Zürich, Forschungsinstitut für militärische Bautechnik, vol. 10, no. FMB 79.10, pp. 2985-3018
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    Publication Date: 1979
    Keywords: Nuclear explosion ; Seismology ; Buechi ; Buchi
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  • 37
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    Eine anormale Geschwindigkeitsstruktur im oberen Erdmantel unter den Ostalpen, abgeleitet aus teleseismischen Laufzeit Residuen der Stationen Schlegeis und Gräfenberg (1979)
    Ludwig-Maximilians-Universität
    In:  Diplomarbeit, München, Ludwig-Maximilians-Universität, vol. 10, no. 28, pp. 309-314
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    Publication Date: 1979
    Keywords: Teleseismic events ; Velocity analysis ; earth mantle ; Seismology ; Bruestle ; Brustle
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    BIBLIOGRAPHY SEISMOLOGY
  • 38
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    Fault plane solutions using relative amplitudes of P and surface reflections: further studies (1979)
    In:  Geophys. J. R. astr. Soc., Basle, Wiley, vol. 60, no. 5441, pp. 459-487, pp. 1264, (ISSN: 1340-4202)
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    Publication Date: 1979
    Keywords: Source ; Seismology ; Fault plane solution, focal mechanism ; GJRaS
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  • 39
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    Die Anwendung von Vorhersagefiltern zur Ereigniserkennung bei digitalen Breitbandseismogrammen (1979)
    Bundesanstalt f. Geowissenschaften und Rohstoffe
    In:  Hannover, Bundesanstalt f. Geowissenschaften und Rohstoffe, vol. 25, no. Publ. No. 12, pp. 95-104, (ISBN: 0-08-043930-6)
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    Publication Date: 1979
    Keywords: Seismology ; Detectors ; Filter- ; Broad-band
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  • 40
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    Erdbeben (1979)
    Hallwag
    In:  Stuttgart, Hallwag, vol. 30, no. Publ. No. 12, pp. 95-104, (ISBN 0-865-42078-5)
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    Publication Date: 1979
    Keywords: Earthquake ; Seismology ; Textbook of geophysics
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  • 41
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    CEDAR: An approach to the computer automation of short period local seismic networks (1979)
    Caltech
    In:  Ph.D. Thesis, Pasadena, CA., Caltech, vol. C 560, 183 pp., no. PL-TR-91-2212(I), pp. 79-84, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Detectors ; sta ; Seismology ; Seismic networks ; High frequency ...
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  • 42
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    A first order scattering solution for modeling elastic wave codas. Part 1. The acoustic case (1979)
    In:  Preprint, Beijing, Halliburton Logging Services, vol. C 560, 183 pp., no. PL-TR-91-2212(II), pp. 938-939, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Seismology ; Seismics (controlled source seismology) ; Scattering ; Coda (waves, ~ of seismograms) ; Wave propagation ; Acoustics
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  • 43
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    Die Bestimmung der seismischen Wellenenergie im Zeitbereich unter Verwendung der digitalen Registrierungen des Seismologischen Zentralobservatoriums Gräfenberg (1979)
    Inst. f. Meteorol. und Geophys., Goethe Univ. Frankfurt
    In:  Diplomarbeit, Roma, Inst. f. Meteorol. und Geophys., Goethe Univ. Frankfurt, vol. C 560, 183 pp., no. 78 (?), pp. 193-210, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Seismology ; Seismic arrays ; Data analysis / ~ processing ; Energy (of earthquakes)
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  • 44
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    Deep structure of the Earth's crust and upper mantle in the USSR according to geophysical and seismological data (1979)
    Lawrence Livermore National Laboratory
    In:  rept., Livermore, Calif., Lawrence Livermore National Laboratory, vol. 10, no. UCID-18099, pp. 1358-1361, (ISBN 3-933346-037)
    Details
    Publication Date: 1979
    Keywords: Review article ; Deep seismic sounding (espec. cont. crust) ; CRUST ; earth mantle ; Seismology ; EUROPROBE (Geol. and Geophys. in eastern Europe)
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  • 45
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    Crustal structure of the western United States (1979)
    U. S. Geol. Surv.
    In:  Prof. Paper, Menlo Park, California, U. S. Geol. Surv., vol. 1034, no. 77-3, pp. 1-74, (ISBN 3-933346-037)
    Details
    Publication Date: 1979
    Keywords: Deep seismic sounding (espec. cont. crust) ; Velocity depth profile ; USGS ; USA ; Seismics (controlled source seismology) ; Seismology
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  • 46
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    Surface wave focal mechanisms for eastern North American earthquakes with tectonic implications (1979)
    In:  J. Geophys. Res., Zagreb, Conseil de l'Europe, vol. 84, no. 4, pp. 3543-3552, pp. L02307, (ISSN 0343-5164)
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    Publication Date: 1979
    Keywords: Seismology ; Fault plane solution, focal mechanism ; Surface waves ; Tectonics ; Source ; JGR
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  • 47
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    SH-wave generation by dislocation sources - A numerical study (1979)
    In:  Bull. Seism. Soc. Am., Zagreb, Conseil de l'Europe, vol. 69, no. 4, pp. 1-15, pp. L02307, (ISSN 0343-5164)
    Details
    Publication Date: 1979
    Keywords: Seismology ; Dislocation ; SH waves ; Source ; BSSA
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  • 48
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    Determination of the seismic design parameters: a stochastic approach (1979)
    Stanford University, California
    In:  Ph.D. Thesis, La Jolla, CA, Stanford University, California, vol. 1034, no. 77-767, pp. 293-297, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Seismology ; Seismic networks ; Seismic arrays ; Statistical investigations
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  • 49
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    HYPOELLIPSE - A computer program for determining local earthquake hypocentral parameters, magnitude, and first motion pattern (1979)
    U. S. Geol. Surv.
    In:  Open-File Report, Houston, U. S. Geol. Surv., vol. C 560, 183 pp., no. 79-431, pp. 1-57, (ISBN 3-933346-037)
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    Publication Date: 1979
    Keywords: Source parameters ; Seismology ; Magnitude ; Hypocentral depth ; Location ; software ; USGS
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  • 50
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    Manual of seismological observatory practice (1979)
    NOAA, U. S. Department of Commerce
    In:  report, Houston, NOAA, U. S. Department of Commerce, vol. 10, no. SE-20, pp. 206-209, (ISBN 0 08 042822 3)
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    Publication Date: 1979
    Keywords: Handbook of geophysics ; Seismology ; Instruments ; BIBTEX?
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  • 51
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    A numerical comparison with an exact solution for the transient response of a cylinder immersed in a fluid (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-02
    Description: The transient response of an elastic cylindrical shell immersed in an acoustic media that is engulfed by a plane wave is determined numerically. The method applies to the USA-STAGS code which utilizes the finite element method for the structural analysis and the doubly asymptotic approximation for the fluid-structure interaction. The calculations are compared to an exact analysis for two separate loading cases: a plane step wave and an exponentially decaying plane wave.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 3; p 23-28
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  • 52
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    Executive summary of Aircraft Icing Specialists Workshop (1979)
    In:  CASI
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    Publication Date: 2006-01-12
    Description: In a period of escalating development costs for new aircraft, there is growing interest in a renewed and coordinated icing research effort to achieve an updating or modernization of each aspect of the technological issues that are involved. This includes the data base, analysis methods, test techniques, and test facilities.
    Keywords: AERODYNAMICS
    Type: Aircraft Icing; p 1-16
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  • 53
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    Safety hazard of aircraft icing (1979)
    In:  CASI
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    Publication Date: 2006-01-12
    Description: The problem of aircraft icing is reported as well as the type of aircraft affected, the pilots involved, and an identification of the areas where reduction in icing accidents are readily accomplished.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; p 21-27
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  • 54
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    Civil Helicopter icing problems (1979)
    In:  CASI
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    Publication Date: 2006-01-12
    Description: The ice capabilities of rotary wing aircraft are examined. Recommendations are given to improve the inadequacies of the weather forecasts pertaining to ice, and to adopt a low maintenance anti-ice system.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; p 29-30
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  • 55
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    Overview of helicopter ice protection system developments (1979)
    In:  CASI
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    Publication Date: 2006-01-12
    Description: Helicopter ice protection design criteria was developed and technological shortcoming in meeting helicopter mission requirements is that of helicopter rotor blade ice protection. Airframe components are protected using existing technology while the rotor blade protected using the cyclic electrothermal deicing concept.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; p 39-65
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  • 56
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    A review of the icing situation from the standpoint of general aviation (1979)
    In:  CASI
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    Publication Date: 2006-01-12
    Description: An overview of the present situation in the field of aircraft icing with respect to certification and operation of nontransport category airplanes is given. Problems of definition and inconsistencies are pointed out. Problems in the forecasting and measurement of icing intensities are discussed. The present regulatory environment is examined with respect to its applicability and appropriateness to nontransport airplanes.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; p 31-38
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  • 57
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    Icing of aircraft Some remarks with an historical slant from a cloud physicist (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Three areas of interest are commented on: cloud physics, nowcasting, and instrumentation. A comparison is made of what was done 30 years ago to what might be done in light of developments in related areas of cloud physics, weather modification and instrumentation.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; p 17-19
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  • 58
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    Numerical solution for perpendicular sonic hydrogen injection into a ducted supersonic airstream (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: This note discusses a computer program being developed to study the flow field near opposing perpendicular fuel injectors in scramjets. The MacCormack time-split, finite difference relaxation technique was used to solve the full two-dimensional compressible Navier-Stokes equations along with energy and species equations. By using this technique, a program was developed to consider the turbulent nonreacting flow of hydrogen and air in a rectangular duct. A damping term, proportional to the second derivative of pressure and temperature, was used to produce a stable solution behind the hydrogen jet in the neighborhood of the recompression shock. A case using actual conditions encountered in current scramjet design was analyzed, with results agreeing qualitatively with experimental observations.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; May 1979
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  • 59
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    Numerical solution of compressible viscous flows (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The presented review is concerned with the problem of calculating compressible viscous flows. Basic numerical considerations and problems associated with calculating viscous flows are examined and current numerical approaches toward the solution of the Navier-Stokes equations are discussed. It is pointed out that the numerical solution of the full time-dependent equations for turbulent flow is not practical with present computers. Therefore, turbulence effects must be accounted for by modeling. Developments related to turbulence modeling are described. In connection with a discussion of numerical methods for solving viscous flow equations, attention is given to numerical domains of dependence of typical explicit and implicit methods, the diffusion problem, the convection-diffusion problem, and the split-hybrid method.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 60
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    The effect of external boundary conditions on condensation heat transfer in rotating heat pipes (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Experimental evidence shows the importance of external boundary conditions on the overall performance of a rotating heat pipe condenser. Data are presented for the boundary conditions of constant heat flux and constant wall temperature for rotating heat pipes containing either pure vapor or a mixture of vapor and noncondensable gas as working fluid.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer; 22; Aug. 197
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  • 61
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    Generalized velocities in the outer region of hypersonic turbulent boundary layers (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: An attempt is made to show that the outer portion of the velocity profile of hypersonic turbulent boundary layers can be transformed so that the constants determined by a best fit to the law of the wake are in reasonable agreement with the wake constant for incompressible boundary layers at the same Reynolds number. Both y transformations (where y is distance from the surface) and velocity transformations produce velocity profiles which, with the proper choice of wall shear stress to give shear velocity, can be reduced to the incompressible law of the wall.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; Aug. 197
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  • 62
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    Turbulence generated by the interaction of entropy fluctuations with non-uniform mean flows (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The turbulence generated by random entropy fluctuations in an accelerating stream is analyzed. The results are obtained by using rapid distortion theory together with a high frequency solution of a previously developed wave equation that governs the small-amplitude unsteady vortical and entropic motion on steady potential flows (Goldstein, 1978). Simple results are obtained for the case of symmetric contraction, expansion or combination of the two. It is shown that the energy of the entropy-generated turbulence increases more rapidly with the contraction ratio of a subsonic flow than that of any imposed upstream turbulence. This result indicates that the entropy-generated turbulence may be more significant than the hydrodynamically generated turbulence in the turbine stages of aircraft engines.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics; 93; July 26
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  • 63
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    Accurate numerical evaluation of modified Struve functions occurring in unsteady aerodynamics (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A method is developed for computing the modified Struve functions that occur in unsteady aerodynamics. The method uses a rational approximation supplemented by an asymptotic series for large argument. Simple recursive formulas for generating the coefficients are derived. The method is capable of generating results of arbitrary accuracy. It can also be used for complex argument and order. For greater computing speed, a method is presented that uses the rational and asymptotic approximations to generate Chebyshev coefficients.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft; 16; July 197
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  • 64
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    Transient ablation of Teflon in intense radiative and convective environments (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: On the basis of this investigation of the high-temperature behavior of polytetrafluoroethylene (PTFE), the transient one-dimensional ablation of PTFE has been developed by taking into account the optical transmittance of both the amorphous zone and the crystalline zone of PTFE layer. Results show that although the exposed surface receded at an apparently steady state, both the internal temperature and the thickness of the gel layer increase continuously due to the internal absorption of radiation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal; 17; June 197
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  • 65
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    Scattering and distortion of the unsteady motion on transversely sheared mean flows (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: It is shown that the pressure and velocity fluctuations of the unsteady motion on a transversely sheared mean flow can be expressed entirely in terms of the derivatives of two potential functions. One of these is a convected quantity that can be specified as a boundary condition and is related to a transverse component of the upstream velocity field. The other can be determined by solving an inhomogeneous wave equation whose source term is also a convected quantity that can be specified as a boundary condition in any given problem. The general theory is used to study the interaction of an unsteady flow with a semi-infinite plate embedded in a shear layer. The acoustic field produced by this interaction is calculated in the limits of low and high frequency. The results are compared with experimental one-third octave sound pressure level radiation patterns. The agreement is found to be excellent, especially in the low frequency range, where the mean-flow and convective effects are shown to have a strong influence on the directivity of the sound.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics; 91; Apr. 27
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  • 66
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    Laminar boundary-layer flow of non-Newtonian fluid (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A solution for the two-dimensional and axisymmetric laminar boundary-layer momentum equation of power-law non-Newtonian fluid is presented. The analysis makes use of the Merk-Chao series solution method originally devised for the flow of Newtonian fluid. The universal functions for the leading term in the series are tabulated for n from 0.2 to 2. Equations governing the universal functions associated with the second and the third terms are provided. The solution together with either Lighthill's formula or Chao's formula constitutes a simple yet general procedure for the calculation of wall shear and surface heat transfer rate. The theory was applied to flows over a circular cylinder and a sphere and the results compared with published data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer; 22; Oct. 197
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  • 67
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    Evolution of a rotating flow in the vicinity of a surface (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Evolution of a rotating flow in a body of fluid bounded by a stationary flat surface is discussed. The calculated results show that the radial pressure gradient is substantially reduced in the region close to the surface, so that letting that gradient be independent of distance from the surface would be expected to give only rough or qualitative estimates. However, the reduced rotation near the stationary surface is still large enough to cause an inflow near the surface and to set up a recirculation pattern. The concentration of vorticity by the radial inflow is not great enough to increase the tangential velocities near the center of rotation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 68
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    Laminar and turbulent flows over a spherically blunted cone with massive surface blowing (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Numerical solutions are presented for the flow over a spherically blunted cone with massive surface blowing. Time-dependent viscous shock layer equations are used to describe the flowfield. The boundary conditions on the body surface include a prescribed blowing rate distribution. The governing equations are solved by a time-asymptotic finite-difference method. Results presented here are only for a perfect gas-type flow at zero angle of attack. Both laminar and turbulent flow solutions are obtained. It is found that the surface blowing smooths out the effect of the curvature discontinuity at the sphere-cone juncture point on the laminar flowfield and results in a negative pressure gradient over the body. The shock slope increases on the downstream portion of the body as the surface blowing rate is increased. The turbulent flow with surface blowing is found to redevelop a boundary-layer-like region near the surface. The effects of this boundary-layer-like region on the flowfield and heating rates are discussed.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; Dec. 197
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  • 69
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    Solitary waves in stratified shear flows (1979)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: An analysis is described of long, finite-amplitude internal waves in a stratified shear flow. Both regular and singular modes are considered with a nonlinear critical layer employed in the latter case. A three-layer model is used to develop the theory and closed-form expressions are obtained relating the phase speed to the Richardson number, the latter quantity being taken as O(1). The amplitude evolution equation is found to be either the Korteweg-de Vries equation or the Benjamin-Davis-Ono equation depending upon the distance of the more remote boundary from the edge of the shear layer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Geophysical and Astrophysical Fluid Dynamics; 13; 1-3,; 1979
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  • 70
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    The shape of a pendent liquid drop (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Formal solutions of the static equilibrium equations for the form of the outer surface of a pendent liquid drop are studied. An approach is adopted in which only the one-parameter family determined by vertex height (u sub 0) need be described. Attention is restricted to rotationally symmetric configurations, and all symmetric solutions are characterized for the case where the Lagrange parameter lambda is equal to zero. It is shown that for any u sub 0 the function u(r; u sub 0) can be extended as a parametric solution of a system of equations for all arc lengths, yielding a curve without limit sets or double points, and that the resulting capillary rotation surface spreads out indefinitely away from the axis r = 0. The asymptotic form of the surface in the case of large absolute values of u sub 0 is characterized quantitatively, along with the global structure of all such surfaces.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 71
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    Fast, conservative schemes for the full potential equation applied to transonic flows (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Implicit approximate factorization techniques (AF) are investigated for the solution of matrix equations resulting from finite-difference approximations to the full potential equation in conservation form. For transonic flows, an artificial viscosity, required to maintain stability in supersonic regions, is introduced by an upwind bias of the density. Two implicit AF procedures are presented, and their convergence performance is compared with that of the standard transonic solution procedure: successive line overrelaxation (SLOR). Subcritical and supercritical test cases are considered. Results indicate a substantial improvement in convergence rate for AF schemes relative to SLOR.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; Feb. 197
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  • 72
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    Transient thermal response of ablating bodies (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A numerical study of transient thermal response of a blunt-nosed axisymmetric body made of Teflon is presented using a two-layer thermal model. It is shown that phase change and transverse heat conduction have a considerable effect on the internal temperature field. Comparison of the numerical results with experimental data shows that the single-layer thermal model does not predict the real feature of the thermal field, whereas the results of the two-layer thermal model agree reasonably well with the experiment.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal; 17; Feb. 197
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  • 73
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    Comparison of a correlation term-discard closure for decaying homogeneous turbulence with experiment (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Turbulence decay is calculated by using experimental initial conditions and discarding quadruple-correlation terms in the correlation equations. Agreement with experiment is good only for moderately small times, but there are no perceptible negative spectral energies even at large times.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids; 22; Jan. 197
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  • 74
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    Criteria for asymptotic supersonic two-dimensional turbulent wakes (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Indicators used to determine the fully developed mean flow for two dimensional turbulent supersonic wakes are examined. The similarity variables for velocity temperature and the transverse coordinate used by Demetriades (1969) and Wagner (1972) are shown not to adequately distinguish transition from developed turbulent flows. The growth rate of the two dimensional turbulent wake as the wake develops from laminar to turbulent are shown to be low in the laminar region, increase at transition, and level off as fully developed turbulence is attained, demonstrating that wake growth rates are better indicators of a fully developed mean flow than are similarity variables.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; July 197
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  • 75
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    Quasi-periodic structure of a turbulent jet (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The instantaneous near field pressure fluctuations of an axisymmetric subsonic jet were measured by using a longitudinal and an azimuthal microphone arrays in order to qualitatively determine the behaviors of the quasi-periodic structure within the flow. Statistical analysis is used to explain the characteristic of the pressure signals. In addition to the information obtained by forming the power spectral density, auto- and cross-correlation functions, two types of signals are extracted through a conditional probability analysis to represent the quasi-periodic and the random fine structures within the turbulent jet. The quasi-periodic structure first appears as a rolling up of the mixing layer flow within one nozzle diameter downstream of the exit, then becomes fully developed at approximately 3 nozzle diameters downstream with a preferred Strouhal number range 0.3-0.4, and finally disappears beyond the end of potential core. This behavior is also reflected in the variation of the convection velocity.
    Keywords: AERODYNAMICS
    Type: Journal of Sound and Vibration; 64; May 8
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  • 76
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    A computational fluid dynamic technique valid at the centerline for non-axisymmetric problems in cylindrical coordinates (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A technique is described for the numerical solution of non-axisymmetric flow problems posed in cylindrical coordinates when the z-axis is included in the flowfield. The highlight of the technique is the manner in which the singularities at the centerline are handled. Specifically, the governing flowfield equations at r = 0 are put in a special form by applying L'Hospital's Rule. The required radial derivatives are evaluated using a one-sided, second-order accurate, first-difference. This leads to a smooth, convergent calculation of the flowfield at the centerline. This appears to be the first generally applicable numerical method for avoiding coordinate system singularities in the context of a finite-difference scheme, and could have application to many nonaxisymmetric flows. The technique is illustrated by specific results for the time-dependent flowfield inside an internal combustion engine.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Computational Physics; 30; Mar. 197
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  • 77
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    Reynolds number effects on the turbulence field in compressible boundary layers (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Detailed experiments were conducted in a zero pressure gradient, supersonic turbulent boundary layer, including measurements of the three components of velocity fluctuations and the turbulent shear stress, for Reynolds numbers ranging from 11.7 million to 105 million at a freestream Mach number of 2.3. The mean flow measurements established the fully developed and equilibrium nature of the boundary layer. Measurements of the turbulence field show that the vertical and transverse fluctuations are essentially equal throughout the boundary layer at all Reynolds numbers, a feature that is different from observations in incompressible flows. The data show that the boundary layer exhibits similarity in the turbulence profiles for the entire Reynolds number range and agrees with previous compressible and incompressible data using Morkovin's scaling to account for compressibility effects.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; Apr. 197
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  • 78
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    Some steady and oscillating airfoil test results, including the effects of sweep, from the tunnel spanning wing (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A large scale tunnel spanning wing was built and tested. The model can be operated as either a swept or unswept wing and can be tested in steady state or oscillated sinusoidally in pitch about its quarter chord. Data is taken at mid-span with an internal 6-component balance and is also obtained from miniature pressure transducers distributed near the center span region. A description is given of the system and a brief discussion of some of the steady and unsteady results obtained to date. These are the steady load behavior to Mach numbers of approximately 1.1 and unsteady loads, including drag, at a reduced frequency of approximately 0.1.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 445-458
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  • 79
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    A new airfoil research capability (1979)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The design and construction of a self streamlining wall test section for the Langley 0.3 meter transonic cryogenic tunnel was included in the fiscal year 1978 construction of facilities budget for Langley Research Center. The design is based on the research being carried out by M. J. Goodyer at the University of Southampton, Southampton, England, and is supported by Langley Research Center. This paper presents a brief description of the project. Included are some of the design considerations, anticipated operational envelope, and sketches showing the detail design concepts. Some details of the proposed operational mode, safety aspects, and preliminary schedule are presented.
    Keywords: AERODYNAMICS
    Type: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 425-432
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  • 80
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    Design and calibration of slotted walls for transonic airfoil wind tunnels (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The traditional procedure for estimating the performance of slotted walls for airfoil wind tunnels is reviewed, and a modification which improves the accuracy of this procedure is described. Unlike the traditional procedure, the modified procedure indicates that the design of airfoil wind-tunnel walls which induce minimal blockage and streamline-curvature effects is feasible. The design and testing of such a slotted wall is described. It is shown experimentally that the presence of a model can affect the plenum pressure and thus make the use of the plenum pressure as a calibration reference questionable. Finally, an ONERA experiment which shows the effect of the sidewall boundary layer on the measured model normal force is discussed.
    Keywords: AERODYNAMICS
    Type: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 433-443
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    Inverse boundary-layer technique for airfoil design (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A description is presented of a technique for the optimization of airfoil pressure distributions using an interactive inverse boundary-layer program. This program allows the user to determine quickly a near-optimum subsonic pressure distribution which meets his requirements for lift, drag, and pitching moment at the desired flow conditions. The method employs an inverse turbulent boundary-layer scheme for definition of the turbulent recovery portion of the pressure distribution. Two levels of pressure-distribution architecture are used - a simple roof top for preliminary studies and a more complex four-region architecture for a more refined design. A technique is employed to avoid the specification of pressure distributions which result in unrealistic airfoils, that is, those with negative thickness. The program allows rapid evaluation of a designed pressure distribution off-design in Reynolds number, transition location, and angle of attack, and will compute an airfoil contour for the designed pressure distribution using linear theory.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 383-397
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  • 82
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    Langley's two-dimensional research facilities: Capabilities and plans (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The current capabilities and the forthcoming plans for Langley's two-dimensional research facilities are described. The characteristics of the Langley facilities are discussed in terms of Reynolds number, Mach number, and angle-of-attack capabilities. Comments are made with regard to the approaches which have been investigated to alleviate typical problem areas such as wall boundary effects. Because of the need for increased Reynolds number capability at high subsonic speeds, a considerable portion of the paper deals with a description of the 20 by 60 cm two-dimensional test section of the Langley 0.3 meter transonic cryogenic tunnel which is currently in the calibration and shakedown phase.
    Keywords: AERODYNAMICS
    Type: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 399-414
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  • 83
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    The prediction of two-dimensional airfoil stall progression (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A generalized boundary condition potential flow calculation method was combined with a momentum integral boundary layer method and a base flow theory of separation to predict airfoil viscous-inviscid interference up to and beyond stall. The resultant program considers laminar and turbulent separation and is, therefore, applicable to thin or thick airfoil stall. The calculated flow field includes the airfoil and the separation bubble recombination region behind the airfoil. Calculated pressure distributions and equivalent airfoil shapes, including the displacement thickness of the viscous regions, are compared with flow field measurements for several airfoils. The measured displacement thicknesses and wake centerlines corroborate the calculated shape. The comparison also suggests the use of the analytical solution to evaluate the measurements.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 335-345
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  • 84
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    Application of numerical optimization to the design of advanced supercritical airfoils (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An application of numerical optimization to the design of advanced airfoils for transonic aircraft showed that low-drag sections can be developed for a given design Mach number without an accompanying drag increase at lower Mach numbers. This is achieved by imposing a constraint on the drag coefficient at an off-design Mach number while minimizing the drag coefficient at the design Mach number. This multiple design-point numerical optimization has been implemented with the use of airfoil shape functions which permit a wide range of attainable profiles during the optimization process. Analytical data for the starting airfoil shape, a single design-point optimized shape, and a double design-point optimized shape are presented. Experimental data obtained in the NASA Ames two-by two-foot wind tunnel are also presented and discussed.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 315-325
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  • 85
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    Improved prediction of laminar leading edge separation (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Research was conducted to provide a definite criterion for the prediction of the bubble burst on airfoils typical of those used for fighter wings. The approach taken was to correlate existing airfoil bubble burst data using various parameters at the laminar separation point. The method due to Weber was modified to provide a continuous analytic solution for the velocity distribution around the airfoil leading edge. Coupling the modified Weber method with the Stratford laminar separation prediction method leads to a universal chart giving the conditions at separation as a function of stagnation location and leading edge radius. Application of the combined method to available two-dimensional airfoil data resulted in an empirical criterion presenting the limiting local velocity gradient at separation as a function of the boundary layer momentum thickness at separation for bubble burst. The correlation leads as well to the qualitative explanation of two types of laminar stall: thin airfoil and leading edge. The validity of the correlation is demonstrated by predicting the lift coefficient and angle of attack for stall on airfoils with leading edge or trailing edge flaps.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 327-334
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  • 86
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    Optimization of multi-element airfoils for maximum lift (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two theoretical methods are presented for optimizing multi-element airfoils to obtain maximum lift. The analyses assume that the shapes of the various high lift elements are fixed. The objective of the design procedures is then to determine the optimum location and/or deflection of the leading and trailing edge devices. The first analysis determines the optimum horizontal and vertical location and the deflection of a leading edge slat. The structure of the flow field is calculated by iteratively coupling potential flow and boundary layer analysis. This design procedure does not require that flow separation effects be modeled. The second analysis determines the slat and flap deflection required to maximize the lift of a three element airfoil. This approach requires that the effects of flow separation from one or more of the airfoil elements be taken into account. The theoretical results are in good agreement with results of a wind tunnel test used to corroborate the predicted optimum slat and flap positions.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt.1; p 237-253
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  • 87
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    Improvements in surface singularity analysis and design methods (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The coupling of the combined source vortex distribution of Green's potential flow function with contemporary numerical techniques is shown to provide accurate, efficient, and stable solutions to subsonic inviscid analysis and design problems for multi-element airfoils. The analysis problem is solved by direct calculation of the surface singularity distribution required to satisfy the flow tangency boundary condition. The design or inverse problem is solved by an iteration process. In this process, the geometry and the associated pressure distribution are iterated until the pressure distribution most nearly corresponding to the prescribed design distribution is obtained. Typically, five iteration cycles are required for convergence. A description of the analysis and design method is presented, along with supporting examples.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 221-236
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  • 88
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    Prospects for computing airfoil aerodynamics with Reynolds averaged Navier-Stokes codes (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Reynolds averaged Navier-Stokes equations are solved numerically for a variety of transonic airfoil configurations where viscous phenomena are important. Illustrative examples include flows past sensitive geometries, Reynolds number effects, and buffet phenomena.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 119-131
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  • 89
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    Overview of two-dimensional airfoil research at Ames Research Center (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The five basic elements of the two dimensional airfoil research program at Ames Research Center are illustrated. These elements are experimental, theoretical (including computational), validation, design optimization, and industry interaction. Each area is briefly discussed.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 39-44
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  • 90
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    Low speed airfoil design and analysis (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A low speed airfoil design and analysis program was developed which contains several unique features. In the design mode, the velocity distribution is not specified for one but many different angles of attack. Several iteration options are included which allow the trailing edge angle to be specified while other parameters are iterated. For airfoil analysis, a panel method is available which uses third-order panels having parabolic vorticity distributions. The flow condition is satisfied at the end points of the panels. Both sharp and blunt trailing edges can be analyzed. The integral boundary layer method with its laminar separation bubble analog, empirical transition criterion, and precise turbulent boundary layer equations compares very favorably with other methods, both integral and finite difference. Comparisons with experiment for several airfoils over a very wide Reynolds number range are discussed. Applications to high lift airfoil design are also demonstrated.
    Keywords: AERODYNAMICS
    Type: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 73-100
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  • 91
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    Langley airfoil-research program (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An overview of past, present, and future airfoil research activities at the Langley Research Center is given. The immediate past and future occupy most of the discussion; however, past accomplishments and milestones going back to the early NACA years are dealt with in a broad-brush way to give a better perspective of current developments and programs. In addition to the historical perspective, a short description of the facilities which are now being used in the airfoil program is given. This is followed by a discussion of airfoil developments, advances in airfoil design and analysis tools (mostly those that have taken place over the past 5 or 6 years), and tunnel-wall-interference predictive methods and measurements. Future research requirements are treated.
    Keywords: AERODYNAMICS
    Type: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 11-38
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  • 92
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    Prediction of aerodynamic characteristics for slender bodies alone and with lifting surfaces to high angles of attack (1979)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A method is presented for computing normal force and pitching moment coefficients for slender bodies of circular and noncircular cross section alone and with lifting surfaces. A semiempirical term representing viscous-separation crossflow is added to a term representing potential-theory crossflow. For bodies of revolution, computed aerodynamic characteristics agree with measured results for investigated free-stream Mach numbers from 0.6 to 2.9 and for angles of attack from 0 deg to 180 deg. For bodies of elliptic cross section, measured results are predicted well over the investigated Mach number range from 0.6 to 2.0 and the angle range from 0 deg to 60 deg. For all bodies the predictions are best at supersonic Mach numbers. For body-wing and body-wing-tail configurations, measured normal force coefficients and centers are predicted at the upper test Mach number of 2.0. As the Mach number is decreased to 0.6, the agreement for the normal-force coefficients rapidly deteriorates. When model flow-separation and vortex patterns are asymmetric, undesirable side forces are usually measured on the models at subsonic Mach numbers and zero sideslip angle. Generally, the side-force coefficients decrease or vanish with: increase in Mach number, decrease in nose fineness ratio, nose blunting, and flattening of body cross section.
    Keywords: AERODYNAMICS
    Type: AGARD High Angle of Attack Aerodyn.; 40 p
    Format: text
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  • 93
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    Recent theoretical developments and experimental studies pertinent to vortex flow aerodynamics, with a view towards design (1979)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Recent progress in a research program directed toward an improved vortex flow technology base was reviewed. Analysis methods for conical flow and analysis and design methods for nonconical flows are presented. Applications are made for a variety of planar, nonplanar, and interferring lifting surfaces. Several methods are shown to provide reasonable estimates of over-all forces and moments for simple wing planforms with the suction analogy method currently offering the most versatility for arbitrary configuration applications. For the prediction of surface loadings the free vortex sheet method being developed by Boeing is shown to have considerable promise and further development of this type of method is encouraged. A data base for ogee strake-wing configurations is summarized with an emphasis on the requirements for maximizing the interference lift. A strake planform design procedure is discussed and a first solution (gothic in planview) is integrated with a wing body. The data show the strake to exhibit expected stable vortex characteristics. It was found that, apart from increasing sweep, conically cambered delta wings developed drag levels approaching that of attached flow with increasing either the lift or the wing camber height, lastly, an approximate vortex flow design method, based on the suction analogy, is outlined and an example is given.
    Keywords: AERODYNAMICS
    Type: AGARD High Angle of Attack Aerodyn.; 31 p
    Format: text
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  • 94
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    The Mechanism of Fluid Resistance (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The mechanism of fluid resistance within the limit of the square law is presented. It was concluded that the investigations should be extended and completed in two directions, namely: by an investigation of stable vortex configurations in space, and by considering the perfect fluid as the limiting case of a viscous fluid and then limiting the law of vortex of formation with the condition that only those fluid particles which were in contact with the surface of the body can receive rotation.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Classical Aerodyn. Theory; p 57-66
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  • 95
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    Considerations of some critical ejector problems (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some aspects of ejector design and application, including, three dimensional effects and cross flow effects are presented.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 363-384
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  • 96
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    Large-scale turbulent structures in jets and in flows over cavities and their relationship to entrainment and mixing (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Large scale structures in jets and in flows over cavities were investigated experimentally to determine their role in entrainment, mixing, and noise production. The presence of these structures resulted in growth of the shear layer and entrainment. Merging of adjacent large scale structures caused the near field pressure signal in excited flows. It is believed that both the entrained fluid as well as its eventual mixing with the jet flow can be controlled by introducing pulsation in the jet flow at a frequency for which the flow is most unstable.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 295-309
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  • 97
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    Recent developments in ejector technology in the Air Force: An overview (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Basic and applied studies in thrust augmentation conducted at the Aerospace Research Laboratory at Wright-Patterson AFB which led to an effective configuration of the jet flap diffuser ejector, are reviewed. A method for compressible ejector flow analysis, developed in support of the preliminary design of an ejector thrust aircraft, is discussed and applied to single- and two-stage ejectors.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 1-22
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  • 98
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    A Comparison of the Aerodynamic Characteristics of Eight Sailwing Airfoil Sections (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The operational characteristics of sailwings are discussed with emphasis placed on the importance of the trailing edge cable tension. The three dimensional aerodynamic characteristics were obtained from wind tunnel tests, and the results compared to determine the magnitude of the aerodynamic penalties paid for various structural simplifications. For the sectional thickness ratios, it is concluded that, while the basic double-membraned sailwing has exceptional aerodynamic performance, even superior for some applications to the conventional hardwing, any notable deviation from this configuration results in an unacceptably large performance penalty.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 155-176
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  • 99
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    Low-speed single-element airfoil synthesis (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The use of recently developed airfoil analysis/design computational tools to clarify, enrich and extend the existing experimental data base on low-speed, single element airfoils is demonstrated. A discussion of the problem of tailoring an airfoil for a specific application at its appropriate Reynolds number is presented. This problem is approached by use of inverse (or synthesis) techniques, wherein a desirable set of boundary layer characteristics, performance objectives, and constraints are specified, which then leads to derivation of a corresponding viscous flow pressure distribution. Examples are presented which demonstrate the synthesis approach, following presentation of some historical information and background data which motivate the basic synthesis process.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 1-31
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  • 100
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    The external augmentor concept for V/STOL aircraft (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The beneficial aspects of an ejector powered V/STOL concept were reviewed. The feasibility of satisfactorily incorporating an ejector system in a high performance V/STOL aircraft was investigated. The external augmentor concept, based on the use of chordwise ejector slots, is presented. It is concluded that the external augmentor concept has a basic inherent simplicity and a sufficient augmentor performance potential to make feasible a high performance V/STOL aircraft based on ejectors.
    Keywords: AERODYNAMICS
    Type: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 449-471
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