Modified GHS collision model compared with VHS

Macrossan, Michael N. and Lilley, Charles Ranald (2005). Modified GHS collision model compared with VHS. In: A. L. Garcia and M. A. Gallis, Abstracts, CDROM. Direct Simulation Monte Carlo: Theory, Methods and Applications, Santa Fe, New Mexico, (). 25-28 September, 2005.

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Author Macrossan, Michael N.
Lilley, Charles Ranald
Title of paper Modified GHS collision model compared with VHS
Conference name Direct Simulation Monte Carlo: Theory, Methods and Applications
Conference location Santa Fe, New Mexico
Conference dates 25-28 September, 2005
Proceedings title Abstracts, CDROM
Place of Publication Albuquerque, NM
Publisher Sandia National Laboratories
Publication Year 2005
Sub-type Fully published paper
Editor A. L. Garcia
M. A. Gallis
Total pages 1
Language eng
Abstract/Summary At low temperatures, where the attractive intermolecular forces are important, the GHS collision model produces a more realistic variation of viscosity with temperature than the standard Variable Hard Sphere (VHS) collision model. A slight modification of the GHS model,[Macrossan and Lilley, J. Thermophysics Heat Trans, 17, 289-291, 2003], makes it no more than 5-15% more computationally expensive than the VHS model. We calculate the supersonic flow of Argon, with a freestream temperature of 100 K, and stagnation temperature of 1300K, around a flat plate normal to the freestream (see Fig. 1). flow. The temperature in the wake region is approximately 500 K, so the viscosity of the two models differs in the wake region. This leads to small differences in the temperature field and the size of the re-circulation region for the GHS, compared with the VHS collision model.
Subjects 240000 Physical Sciences
290000 Engineering and Technology
Q-Index Code EX

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Created: Mon, 18 Aug 2008, 14:44:28 EST by Michael N Macrossan on behalf of School of Mechanical and Mining Engineering