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  • AERODYNAMICS  (16)
  • GEOPHYSICS  (8)
  • 1
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    Calculative techniques for transonic flows (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Calculation methods for predicting transonic aerodynamic characteristics of wing-body combinations
    Keywords: AERODYNAMICS
    Type: NASA, WASHINGTON ANAL. METHODS IN AIRCRAFT AERODYN. 1970; P 53-73
    Format: text
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  • 2
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    Patterns of magnetic field merging sites on the magnetopause (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Models of the magnetospheric and magnetosheath magnetic fields are used to determine the relative orientations of the two near the dayside magnetopause for the purpose of locating potential merging sites. Areas of the magnetopause with various degrees of antiparallelness for different Interplanetary fields as contour diagrams are studied. For southward and GSE-Y interplanetary field, the patterns obtained are consistent with those envisioned by Crooker in an earlier analysis which used simplified representations for the magnetic field geometry. Here the application of realistic models shows the locations of areas where any antiparallel component occurs. Merging sites for radial interplanetary fields are also illustrated. The results suggest that the geometrical configuration of the fields is suitable for merging over a large fraction of the magnetopause for interplanetary fields that are either primarily southward, GSE-Y, or radial (GSE-X) in direction.
    Keywords: GEOPHYSICS
    Type: Neilsen Eng. and Res., Inc. Appl. of a Global Solar Wind/Planetary Obstacle Interaction Computational Model 10p (SEE N84-26509 16-88)
    Format: text
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  • 3
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    Magnetic field draping against the dayside magnetopause (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Interplanetary magnetic fields observed upstream of Earth's magnetosphere at ISEE 3 form input for a gasdynamic model of magnetic field draping in the dayside magnetosheath. Model results near the magnetopause are compared with appropriately lagged observations at ISEE 1. In 16 to 24 cases, the angle between the transverse component of the model and observed fields is less than 20 deg. The agreement is surprisingly good in view of the uncertainty introduced by the large distances between ISEE 1 and ISEE 3. The results indicate that magnetohydrodynamic and energy transfer processes at the magnetopause do not cause large distortions of the magnetosheath magnetic field. In addition, a comparison between observed and model field magnitudes indicates that immediately outside the magnetopause the observed field behaves like the model field at a distance of approx. 0.5 R sub E from the magnetopause, outside the region where magnetohydrodynamic effects make the gasdynamic model inapplicable. Patterns of model magnetic field orientation at the magnetopause are presented for practical application.
    Keywords: GEOPHYSICS
    Type: Neilsen Eng. and Res., Inc. Appl. of A Global Solar Wind/Planetary Obstacle Interaction Computational Model 18p (SEE N84-26509 16-88)
    Format: text
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  • 4
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    Magnetopause merging site asymmetries (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Regions where a draped model magnetosheath magnetic field is nearly antiparallel to a model geomagnetic field are shown to be asymmetric for an interplanetary magnetic field (IMF) at the garden hose angle, as suggested by Heelis. When the IMF has a southward component, the asymmetry favors the dawn region for both IMF polarities. The dusk region is favored when the IMF has a northward component. If the regions of antiparallel fields are assumed to be sites of maximum magnetic merging, then the asymmetry is consistent with observed seasonal variations of geomagnetic activity and with dawn-displaced magnetospheric phenomena. In the alternate merging geometry of a line passing through the subsolar region, the asymmetry is predominantly north-south rather than dawn-dusk. Merging line geometry is consistent with the seasonal variations but not with the dawn-displaced phenomena.
    Keywords: GEOPHYSICS
    Type: Neilsen Eng. and Res., Inc. Appl. of A Global Solar Wind/Planetary Obstacle Interaction Computational Model 23p (SEE N84-26509 16-88)
    Format: text
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  • 5
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    Magnetic field draping against the dayside magnetopause (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Interplanetary magnetic fields observed upstream of earth's magnetosphere at ISEE 3 form input for a gasdynamic model of magnetic field draping in the dayside magnetosheath. Model results near the magnetopause are compared with appropriately lagged observations at ISEE 1. In 16 to 24 cases, the angle between the transverse component of the model and observed fields is less than 20 deg. The agreement is surprisingly good in view of the uncertainty introduced by the large distances between ISEE 1 and ISEE 3. The results indicate that magnetohydrodynamic and energy transfer processes at the magnetopause do not cause large distortions of the magnetosheath magnetic field. In addition, a comparison between observed and model field magnitudes indicates that immediately outside the magnetopause the observed field behaves like the model field at a distance of approx. 0.5 R sub E from the magnetopause, outside the region where magnetohydrodynamic effects make the gasdynamic model inapplicable. Patterns of model magnetic field orientation at the magnetopause are presented for practical application.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 3505-351
    Format: text
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  • 6
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    Magnetopause merging site asymmetries (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Regions where a draped model magnetosheath magnetic field is nearly antiparallel to a model geomagnetic field are shown to be asymmetric for an interplanetary magnetic field (IMF) at the garden hose angle, as suggested by Heelis. When the IMF has a southward component, the asymmetry favors the dawn region for both IMF polarities. The dusk region is favored when the IMF has a northward component. If the regions of antiparallel fields are assumed to be sites of maximum magnetic merging, then the asymmetry is consistent with observed seasonal variations of geomagnetic activity and with dawn-displaced magnetospheric phenomena. In the alternate merging geometry of a line passing through the subsolar region, the asymmetry is predominantly north-south rather than dawn-dusk. Merging line geometry is consistent with the seasonal variations but not with the dawn-displaced phenomena.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 341-346
    Format: text
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  • 7
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    Development of a nonlinear unsteady transonic flow theory (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A nonlinear, unsteady, small-disturbance theory capable of predicting inviscid transonic flows about aerodynamic configurations undergoing both rigid body and elastic oscillations was developed. The theory is based on the concept of dividing the flow into steady and unsteady components and then solving, by method of local linearization, the coupled differential equation for unsteady surface pressure distribution. The equations, valid at all frequencies, were derived for two-dimensional flows, numerical results, were obtained for two classses of airfoils and two types of oscillatory motions.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2258 , NEAR-TR-46
    Format: application/pdf
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  • 8
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    Calculative techniques for transonic flows about certain classes of wing body combinations (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Procedures based on the method of local linearization and transonic equivalence rule were developed for predicting properties of transonic flows about certain classes of wing-body combinations. The procedures are applicable to transonic flows with free stream Mach number in the ranges near one, below the lower critical and above the upper critical. Theoretical results are presented for surface and flow field pressure distributions for both lifting and nonlifting situations.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2103
    Format: application/pdf
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  • 9
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    Calculative techniques for transonic flows about certain classes of wing-body combinations, phase 2 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Theoretical analysis and associated computer programs were developed for predicting properties of transonic flows about certain classes of wing-body combinations. The procedures used are based on the transonic equivalence rule and employ either an arbitrarily-specified solution or the local linerization method for determining the nonlifting transonic flow about the equivalent body. The class of wind planform shapes include wings having sweptback trailing edges and finite tip chord. Theoretical results are presented for surface and flow-field pressure distributions for both nonlifting and lifting situations at Mach number one.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2157
    Format: application/pdf
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  • 10
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    Aerodynamics of slender bodies and wing-body combinations at a free-stream Mach number equal to one - Theory and experimental evaluation (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Aerodynamics of steady, inviscid transonic flows around slender bodies and wing-body combinations at free stream Mach number one
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 70-798
    Format: text
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