高超声速化学非平衡流动Navier-Stokes/DSMC耦合算法

doi:10.7527/S1000-6893.2018.22229

Abstract

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

CLC Number:

V411
O356

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.

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

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