A NEW HYBRID FOKKER-PLANCK-DSMC APPROACH FOR MODELING RAREFIED GAS IN CONVERGANT-DIVERGANT NOZZLE WITH PLUME

Authors

1 Mechancial Eng. Dept. Ferdowsi University of Mashhad

2 Mechanical Eng. Dept., Ferdowsi University of Mashhad

Abstract

In this paper, we propose a new hybrid algorithm for modeling gas flow in converagant divergant nozzle with plume. For many years, the Fokker Planck (FP) approach has been well known for modeling gas flows. This method is an approximation of the Boltzmann equation. According to other molecular approaches, it has less computational cost. However there are some errors in modeling shocks for FP. The DSMC approach is accurate enough to be Known as one of the best approach for modeling gas flows. However this approach has high computational cost, Especially at low Knudsen numbers. The purpose of this article is finding an optimized hybrid algorithm to use high speed modeling and sufficient accuracy simultaneously. The results showed that by using DSMC in throat and near the shock zone, we can obtain an efficient hybrid algorithm such as FP and accurate algorithm such as direct simulation Monte Carlo (DSMC) method.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 4
December 2021
Pages 331-343

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