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Algorithm For Hypersonic Flow In Chemical EquilibriumImplicit, finite-difference, shock-capturing algorithm calculates inviscid, hypersonic flows in chemical equilibrium. Implicit formulation chosen because overcomes limitation on mathematical stability encountered in explicit formulations. For dynamical portion of problem, Euler equations written in conservation-law form in Cartesian coordinate system for two-dimensional or axisymmetric flow. For chemical portion of problem, equilibrium state of gas at each point in computational grid determined by minimizing local Gibbs free energy, subject to local conservation of molecules, atoms, ions, and total enthalpy. Major advantage: resulting algorithm naturally stable and captures strong shocks without help of artificial-dissipation terms to damp out spurious numerical oscillations.
Document ID
19890000520
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Palmer, Grant
(NASA Ames Research Center, Moffett Field, CA.)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 10
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
ARC-12140
Accession Number
89B10520
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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