Test of Efficiency of Variable Hard Sphere (VHS) and Variable Soft Sphere (VSS) Models in the Direct Simulation Monte Carlo Method

Abstract

The efficiency of the variable hard sphere (VHS) and variable soft sphere (VSS) molecular models is investigated by estimating the transport coefficients, and simulating a free jet in a binary gas mixture and a normal shock wave structure in a binary gas mixture using the Lennard-Jones (6-12) (LJ) potential and LJ potential (type) VHS and VSS models. It is confirmed that the transport coefficients using the VSS model are consistent with those of the LJ potential and calculated results using the VSS model for free jet and shock wave structures are in good agreement with those of LJ potential. There are, however, some discrepancies in transport coefficients and results calculated using the VHS model and LJ potential.