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  • 1
    Electronic Resource
    Electronic Resource
    Vectored injection into isobaric laminar boundary layer flows (1972)
    Springer
    Heat and mass transfer 5 (1972), S. 201-203 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird eine systematische Untersuchung ähnlicher Lösungen der Blasius-Gleichung in einem weiten Bereich der normalen und tangentialen Ausblasgeschwindigkeit vorgelegt, wobei nur Strömungen mit nicht-verschwindender Schubspannung, aber beliebiger Ausblasrichtung betrachtet werden. Man findet, daß eine positive tangentiale (stromabwärts gerichtete) Komponente der Ausblasgeschwindigkeit den Stoff-übergangsstrom beträchtlich erhöht, der zum Wegblasen der Grenzschicht erforderlich ist. Für stromaufwärts gerichtetes Ausblasen wird eine neue Gruppe von Lösungen in einem gewissen Bereich der tangentialen Wandgeschwindigkeit gefunden, innerhalb dessen die Wandschubspannung verdoppelt wird.
    Notes: Abstract The results of a systematic study of self-similar solutions of the Blasius equation are presented for a wide range of both normal and tangential surface injection velocities. Only flows with non-vanishing shear are considered; however, an arbitrary orientation of the injection vector is allowed. It is found that a positive tangential component of injection (downstream vectoring) significantly increases the mass transfer rate required to blow off the boundary layer. For upstream vectoring, a new group of solutions is found over a certain range of the tangential wall velocity wherein the wall shear is doublevalued.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106915
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the curvature of compressible boundary layer flows near separation (1977)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 28 (1977), S. 1027-1035 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß die analytische Beziehung von Oswatitsch für den Neigungswinkel einer zähflüssigen Strömungsablösung (oder das Wiederanlegen), in Übereinstimmung ist mit detaillierten Versuchsergebnissen an einer Überschall-Grenzschichtströmung längs einer Kompressionsecke. Darüber hinaus wird eine Erweiterung dieser Theorie angegeben, welche eine vergleichbare Beziehung für die Stromlinienkrümmung im Bereich über dem Ablösepunkt, sowohl für laminare als auch turbulente zweidimensionale Grenzschichtströmung gibt. Dieses Ergebnis wird zu einer Abschätzung möglichen Auftretens von Görtlerschen Wirbeln in Strömungsrichtung infolge dieser Krümmung verwendet.
    Notes: Summary Oswatitsch's analytical expression for the slope of a viscous flow separation or reattachment streamline is shown to be consistent with detailed experimental data on a supersonic boundary layer flow past a compression corner. An extension of his analysis is then given which yields a comparable new relation for the streamlinecurvature just above separation in either laminar or turbulent two-dimensional compressible boundary layer flows. This result is applied to examine the possible occurrence of Görtler streamwise vortices due to such curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01601670
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  • 3
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    On the curvature of compressible boundary layer flows near separation (1977)
    Springer
    Details
    Publication Date: 1977-11-01
    Print ISSN: 0044-2275
    Electronic ISSN: 1420-9039
    Topics: Mathematics , Physics
    Published by Springer
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  • 4
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    Strong Blowing across a Couette-Poiseuille Shear Flow (1969)
    American Institute of Physics
    Details
    Publication Date: 1969-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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  • 5
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    Vectored injection into isobaric laminar boundary layer flows (1972)
    Springer
    Details
    Publication Date: 1972-12-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 6
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    Application of the triple-deck theory of viscous-in viscid interaction to bodies of revolution (1983)
    Cambridge University Press
    Details
    Publication Date: 1983-04-01
    Description: The general triple-deck theory of laminar viscous-inviscid interaction is extended to axisymmetric bodies. With body radius/length ratios scaled in terms of Reynolds number as Re−1/8β(β 〉 0), it is found that for β 〈 3 the only three-dimensional effect is that on the incoming undisturbed boundary-layer profile as accounted for by the Mangler transformation. When β = 3, however, an explicit axisymmetric effect on the interaction equations also enters: the upper-deck flow is governed by the equation of axisymmetric potential disturbance flow, whereas the middle and lower decks are still governed by equations of two-dimensional form. When β 〉 3, the body is so slender that transverse curvature effects become important and the lower decks too are explicitly influenced by three-dimensional effects. A detailed example application of this theory is given for weak interactions on a flared cylinder and cone in supersonic flow with β ≤ 3. The three-dimensional effects on the interactive pressure and shear-stress distributions are shown to relieve the strength of the interaction and reduce its upstream influence, as expected. Correspondingly, it is found that the smallest flow deflection angle provoking incipient separation increases with increasing axisymmetric body slenderness. These results are shown to be in qualitative agreement with several experimental studies. © 1983, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 7
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    Turbulent eddy viscosity modeling in transonic shock/boundary-layer interactions (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The treatment of turbulence effects on transonic shock/turbulent boundary layer interaction is addressed within the context of a triple deck approach valid for arbitrary practical Reynolds numbers between 1000 and 10 billion. The modeling of the eddy viscosity and basic turbulent boundary profile effects in each deck is examined in detail using Law-of-the-Wall/Law-of-the-Wake concepts as the foundation. Results of parametric studies showing how each of these turbulence model aspects influences typical interaction zone property distributions (wall pressure, displacement thickness and local skin friction) are presented and discussed.
    Keywords: AERODYNAMICS
    Type: NASA, Langley Research Center, Transonic Symposium: Theory, Application, and Experiment, Volume 1, Part 2; p 611-627
    Format: application/pdf
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  • 8
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    Asymptotic analytical methods in fluid mechanics related to drag prediction (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some recent theoretical work of a purely analytical nature is described which promises to provide engineering predictions for the important drag-related phenomena of flow in the stall regime. This analytical work deals with rigorous asymptotic studies of the complete Navier-Stokes equations that govern the viscous flow around any aerodynamic body under conditions where boundary layer separation takes place from the body surface.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Kansas Univ. Proc. of the NASA, Ind., Univ., Gen. Aviation Drag Reduction Workshop; p 117-124
    Format: application/pdf
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  • 9
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    Application of unsteady laminar triple-deck theory to viscous-inviscid interactions from an oscillating flap in supersonic and subsonic flow (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Unsteady triple-deck theory is applied to analyze the local viscous-inviscid interaction of an idealized oscillating flap with a laminar boundary layer in either supersonic or subsonic external flow. For small flap amplitudes and small-to-moderate nondimensional frequencies, linearized analytical solutions by means of Fourier transformation are given for the pressure and shear distributions ahead of and behind the flap hinge. In the supersonic case, the predicted unsteady viscous effects reduce the pressure amplitude and spread it out upstream while causing it to lag the quasi-steady inviscid prediction (flap motion); this also results in an unsteady delay of incipient separation at the hinge to a higher flap amplitude. In contrast, the lowered unsteady viscous pressure distribution in purely subsonic flow slightly leads the flap motion, resulting in incipient separation at a smaller flap amplitude than the quasi-steady value. These trends are shown to be in qualitative agreement with available experimental data.
    Keywords: AERODYNAMICS
    Type: Journal de Mecanique Theorique et Appliquee (ISSN 0750-7240); 2; 3 19; 1983
    Format: text
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  • 10
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    Supersonic laminar base pressure, heat-transfer, and upstream influence correlations for small steps (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Some results of the application of a unified theory of small disturbances in nonuniform high-speed boundary layers to the small-step problem for the case of supersonic laminar nonadiabatic flow are described. Comparisons with experimental data are given which show good agreement in a variety of physical features, including useful new base pressure and heat-transfer correlation relations. Using a small perturbation approach, an analytical theory is developed that predicts the steady-state pressure, temperature, and heat-transfer disturbance fields including suction or blowing through the step. Particular emphasis is placed on the important effects of the highly nonuniform flow across the boundary layer, lateral pressure gradients, and the upstream influence associated with viscous-inviscid interaction. Approximate analytical expressions for the wall pressure, skin friction, and heat-transfer perturbations and upstream influence distance are derived by a Fourier transformation approach.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 12; Aug. 197
    Format: text
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