Transactions of Nanjing University of Aeronautics & Astronautics
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Study of Hybrid Grid DSMC Method for Chemicalnonequilibrium on Rarefied Flow Heating
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Abstract:
In the present study, the influence of the chemical nonequilibrium on the thermal characteristics is explored by using 2D hybrid grid direct simulation Monte Carlo(DSMC) parallel method. An improved molecule search algorithm is proposed, which can preserve the high efficiency of area search algorithm. This method can not only overcome the defects of area search algorithm, but also give all information about molecules hitting surface. The heat flux calculation method of rarefied hypersonic flow is established, testing methods of chemical reaction probability for five species of mixed gas with limited speed chemical reactions are also selected. To validate the effectiveness of the present method, hypersonic flow around cylinder is firstly simulated, and subsequently numerical simulations of the heat flux and flow field characteristics around the blunt body at different heights are carried out in the paper under two different cases: thermal nonequilibrium condition and thermochemical nonequilibrium condition. Numerical results demonstrate the validity and reliability of methods developed in this paper.
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