An entropy correction method for unsteady full potential flows with strong shocks
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An entropy correction method for unsteady full potential flows with strong shocks

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Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in English

Subjects:

  • Aerodynamics.,
  • Entropy.

Book details:

Edition Notes

StatementWoodrow Whitlow, Jr., Mohamed M. Hafez, Stanley J. Osher.
SeriesNASA technical memorandum -- 87769.
ContributionsHafez, M. M., Osher, Stanley J., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL14662043M

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The simulation of inviscid flows over a cylinder can be considered a benchmark problem to test new Euler codes. Moreover, any airfoil (or any closed curve) can be mapped to a circle. Nonuniqueness of transonic flows are also studied based on the numerical solutions of potential and Euler equations for flows over a cylinder [10], [11].Cited by: 7. A correction to the unsteady full potential equation for flows with strong shocks was obtained. This modification inputs the correct entropy jumps at shocks. Numerical experiments on airfoils were Author: Stanley Osher.   This paper introduces a local piston theory with viscous correction for the prediction of hypersonic unsteady aerodynamic loads at high attitudes and large Mach numbers. A semi-empirical relation accounting for the viscous interaction effects to determine the effective shape is by: Close Drawer Menu Close Drawer Menu Menu. Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of .

An Entropy Correction Method for Unsteady Full Potential Flows With Strong Shocks, W. Whitlow, Jr., M. M. Hafez, and S. J. Osher, Journal of Fluids and Structures, (33%) Calculations of Transonic Flows With Shocks Using Newton's Method and Direct Solver: Part II. An entropy correction method for the unsteady full potential equation is presented. The unsteady potential equation is modified to account for entropy jumps across shock waves. an entropy correction method for unsteady full potential flows with strong shocks, w. whitlow, jr., m. m. hafez, and s. j. osher, journal of fluids and structures, (33%) calculations of trans flows w/ shocks using newton 's method & direct solver: part ii. solution of euler equations. Assuming that CFD solutions will be more and more used to characterize losses in terms of drag for external flows and head loss for internal flows, we suggest to replace single-valued data, like the drag force or a pressure drop, by field information about the losses. These information are gained when the entropy generation in the flow field is analyzed, an approach that often is called second Cited by:

  In the present work we have developed a full potential model with chemical reactions and numerical methods for its solution, including cases with strong sharp shocks. Moreoever, we introduced a new scheme based on pressure correction using a hyperbolic equation and the results have been verified for an unsteady one dimensional : William E. Tavernetti, Mohamed M. Hafez. Klopfer and Nixon further showed that adding a non-isentropic correction to the full potential formulation greatly improved the results for strong shocks. Several authors, such as Le Balleur [ 7 ], Melnik et al. [ 8 ], and Van Muijden et al. [ 9 ], also added an interactive boundary layer modeling capability to full potential solvers and were. SIAM Journal on Numerical Analysis , Abstract | PDF ( KB) () A Godunov-type finite volume method for the system of Shallow water by: @article{osti_, title = {Segmented domain decomposition multigrid solutions for two and three-dimensional viscous flows}, author = {Srinivasan, K and Rubin, S G}, abstractNote = {Several viscous incompressible two and three-dimensional flows with strong inviscid interaction and/or axial flow reversal are considered with a segmented domain decomposition multigrid (SDDMG) procedure.