Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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A formulation of the lambda scheme for the analysis of two dimensional inviscid, compressible, unsteady transonic flows is presented. The scheme uses generalized Riemann variables to determine the appropriate two point, one sided finite difference approximation for each derivative in the unsteady Euler equations. These finite differences are applied at the predictor and corrector levels with shock updating at each level. The weaker oblique shocks are captured, but strong near normal shocks are fitted into the flow using the Rankine-Hugoniot relations. This code is demonstrated with a numerical example of a duct flow problem with developing normal and oblique shock waves. The technique is implemented in a code which has been made efficient by streamlining to a minimal number of operations and by eliminating branch statements. The scheme is shown to provide an accurate analysis of the flow, including formation, motions, and interactions of shocks; the results obtained on a relatively coarse mesh are comparable to those obtained by other methods on much finer meshes.
Author: Gino Moretti
Publisher:
ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 203
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Author: J. S. Hesthaven
Publisher:
ISBN: 9788755021020
Category : Air
Languages : en
Pages : 203
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1028
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Michel Bechtold
Publisher: Forschungszentrum Jülich
ISBN: 3893367950
Category :
Languages : en
Pages : 161
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Author: A. Watson
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
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Author: D. F. De Santo
Publisher:
ISBN:
Category : Difference equations
Languages : en
Pages : 90
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Book Description
A finite-difference technique is developed for analyzing the time-dependent two-dimensional flow of an incompressible viscous fluid over a semi-infinite flat plate. The complete (nonlinear) equations of motion for perturbed Blasius flow are numerically integrated with respect to time, and the propagation of disturbances in the boundary layer is determined. An analysis of the theoretical convergence and stability properties of the difference scheme is carried out. The method developed has been employed in two test calculations, in which slightly unstable oscillatory disturbances have been introduced at some upstream point. The numerical solutions exhibit many of the major theoretical and experimentally observed features associated with transition from laminar to turbulent boundary-layer flow.
Author: Paul R. Wieber
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Author:
Publisher:
ISBN:
Category : Cavitation
Languages : en
Pages : 148
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