par Baras, Florence ;Malek-Mansour, Mohammad-Ali ;Garcia, A. L.;Mareschal, Michel
Référence Journal of Computational Physics, 119, 1, page (94-104)
Publication Publié, 1995
Article révisé par les pairs
Résumé : The direct simulation Monte Carlo (DSMC) algorithm, introduced in 1976 by G. A. Bird, proves to be extremely efficient for simulating dilute gas flows. However, due to the relatively large transport coefficients at low densities, a high Rayleigh or Reynolds number is difficult to achieve by this technique. We present a modified version of DSMC in which the relaxation processes are enhanced and the transport coefficients reduced. This is achieved by increasing the ratio between collisions and free flow of particles in a suitable way. The modified algorithm is mostly useful for statistical physics applications, since it leads to the correct fluctuation spectrum. Several computational experiments are described; they demonstrate that the correct equilibrium and nonequilibrium fluid properties are preserved. The new algorithm is shown to be significantly more efficient than molecular dynamics for simulating complex hydrodynamical flows. © 1995 Academic Press. All rights reserved.