A review of the kinetic detail required for accurate predictions of normal shock wavesSeveral aspects of the kinetic models used in the collision phase of Monte Carlo direct simulations have been studied. Accurate molecular velocity distribution function predictions require a significantly increased number of computational cells in one maximum slope shock thickness, compared to predictions of macroscopic properties. The shape of the highly repulsive portion of the interatomic potential for argon is not well modeled by conventional interatomic potentials; this portion of the potential controls high Mach number shock thickness predictions, indicating that the specification of the energetic repulsive portion of interatomic or intermolecular potentials must be chosen with care for correct modeling of nonequilibrium flows at high temperatures. It has been shown for inverse power potentials that the assumption of variable hard sphere scattering provides accurate predictions of the macroscopic properties in shock waves, by comparison with simulations in which differential scattering is employed in the collision phase. On the other hand, velocity distribution functions are not well predicted by the variable hard sphere scattering model for softer potentials at higher Mach numbers.
Document ID
19920070097
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Muntz, E. P. (NASA Headquarters Washington, DC United States)
Erwin, Daniel A. (NASA Headquarters Washington, DC United States)
Pham-Van-diep, Gerald C. (Southern California, University Los Angeles, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: International Symposium on Rarefied Gas Dynamics