Modeling of Low-Speed Rarefied Gas Flows Using a Combined ES-BGK/DSMC Approach (Preprint)

摘要

Modeling of low speed gas flows at moderate Knudsen numbers, where conventional continuum CFD methods are inapplicable and kinetic methods are either inaccurate or prohibitively expensive, presents a significant challenge for computational modeling. In this work, an approach that combines a finite- volume solution of the ES-BGK model kinetic equation and the statistical DSMC method to accurately predict radiometric forces on a vane in large vacuum chamber filled with rarefied gas is presented. The approach in effect combines the accuracy of a statistical solution of the Boltzmann equation with the numerical efficiency of a deterministic solution of simplified model kinetic equations.