Navier-Stokes/DSMC hybrid algorithm for hypersonic flows with chemical non-equilibrium

LI Zhonghua; DANG Leining; LI Zhihui

doi:10.7527/S1000-6893.2018.22229

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2018 , Vol. 39 >Issue 10: 122229 - 122229

DOI: https://doi.org/10.7527/S1000-6893.2018.22229

Fluid Mechanics and Flight Mechanics

Navier-Stokes/DSMC hybrid algorithm for hypersonic flows with chemical non-equilibrium

LI Zhonghua ,
DANG Leining ,
LI Zhihui

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1. Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. National Laboratory of Computational Fluid Dynamics, Beijing 100083, China

Received date: 2018-04-20

Revised date: 2018-06-11

Online published: 2018-06-25

Supported by

National Basic Research Program of China (2014CB744100); National Natural Science Foundation of China (91530319, 11325212)

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Abstract

Based on the same chemical reaction model, an Navier-Stokes/Direct Simulation Monte Carlo (DSMC) hybrid algorithm with chemical non-equilibrium is proposed by using the Modular Particle-Continuum (MPC) technique using current Computational Fluid Dynamics (CFD) and DSMC methods. The DSMC region is selected automatically according to the CFD results in this hybrid scheme based on local Knudson numbers. A sub-relax technique for information exchange between CFD and DSMC is developed to restrain the effect of statistical fluctuation from DSMC to CFD. This extends the application of the DSMC and the CFD method, and provides an approach to predict the chemical non-equilibrium characteristics in the near-continuum transition flow regime. The hypersonic flow with chemical non-equilibrium around a 2D cylinder is simulated by the Navier-Stokes/DSMC hybrid method proposed. A comparison of the simulation result obtained with the method proposed and that with other methods shows that the results obtained with the method proposed are good agreement with the results obtained with full DSMC in terms of flow structure, non-equilibrium phenomenon, surface parameters and aerodynamics characteristics. This verifies the adaptability and reliability of the proposed Navier-Stokes/DSMC hybrid algorithm in simulating hypersonic flows for the transition flow regime. The chemical non-equilibrium flows around a fragment from a disintegrated aerocraft are simulated to obtain the aerodynamic force and thermal characteristics of the fragment in the transition region, thus providing some reference for simulation of fragment fall.

Key words： transition flow; CFD; DSMC; information exchange; hybrid algorithm; chemical non-equilibrium

Cite this article

LI Zhonghua , DANG Leining , LI Zhihui . Navier-Stokes/DSMC hybrid algorithm for hypersonic flows with chemical non-equilibrium[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018 , 39(10) : 122229 -122229 . DOI: 10.7527/S1000-6893.2018.22229

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