Improved Collision Modeling for Direct Simulation Monte Carlo Methods

Summers, Sarah E.

ISBN 10: 1288307721 / ISBN 13: 9781288307722

Published by BiblioScholar 2012-11, 2012

Seller Inventory # 6666-IUK-9781288307722

Synopsis:

In the Smoothed Accept/Reject (SAR) algorithm, the accept/reject criteria is altered from Direct Simulation Monte Carlo (DSMC): rather than a binary function of rejection or acceptance, collisions can be partially accepted with a linear weighting between zero and one. The partial acceptance is based on a band around the original accept/reject criteria defined as a percentage of the collision criteria, which is called ??. A relationship previously noted between Mach and ?? is explored. Velocity distributions of the particles are examined for all algorithms and compared to experimental data to determine the effect of the SAR algorithm at a microscopic level. All of the comparisons to experiment show a Mach dependency that has previously been noted, and the dependency was defined for the normal shock simulations. DSMC does adequately simulate the nonequilibrium within the cells at a high Mach number through the shock, but SAR does. The SAR algorithm models the flowfield in the shock better than DSMC through a change in the collision rate and particle sampling methods, which allows for a more accurate simulation.

Bibliographic Details

Title: Improved Collision Modeling for Direct ...
Publisher: BiblioScholar 2012-11
Publication Date: 2012
Binding: PF
Condition: New