Evaluation of a New Collision Partner Selection Scheme in the Framework of the Direct Simulation Monte Carlo (DSMC)

The current study concerns to the presentation andassessment of a new collision scheme, i.e., GeneralizedBernoulli Trials (GBT) scheme, in the Direct Simulation ofMont Carlo (DSMC) method. Here, in the new collisionscheme, Generalized Bernoulli Trial (GBT), we used a valueof number of selected pairs (Nsel) smaller than (N-1), i.e. Nsel<(N-1), where N is the number of particles per cell. Thecollision frequency and accuracy of the solution is kept thesame as the original collision models in the DSMC, i.e.,Nearest Neighbor (NN) or SBT. Additionally, this methodhas less computational costs in comparison with the SBTmodel due to checking a smaller number of pairs for thecollision. To assess the accuracy and effectiveness of theGBT scheme, the lid-driven cavity flow has been consideredas the test case.