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�������պ����ѧѧ�� 2006, Vol. 32 Issue (04) :387-390    DOI:
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Adaptive local time step method for DSMC code
Du Yongle, Yan Chao*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Theoretic analysis reveals that, ALTS(adaptive local time step) method offered by Laux, although greatly reducing the execution CPU time needed for the flow to reach to a steady state and thus leading to high simulation efficiency of DSMC(direct simulation of Monte Carlo) method codes, has some drawbacks in complicating molecules’ moving and collision calculations and in requiring additional RAM. Modifications were made to time intervals at which molecular moving and collision are computed, and to the collision sampling method. These modifications simplified molecules’ moving and collision computation, and also avoid the consumption of unnecessary RAM. The modified ALTS method was adopted in the DSMC code. Simulations of rarefied gas flow over a cylinder were performed with and without this modified ALTS method, and the result shows that these modifications result in a significant reduction in the execution CPU time, but introduce little difference on the simulation resolution and the flow structure.
Keywords�� rarefied gas   direct simulation of Monte Carlo   adaptive local time step     
Received 2005-04-08;
About author: ������(1979-),��,������ʩ��,˶ʿ��, yongle.du@gmail.com.
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������, �ֳ�.DSMC�����е�����Ӧ����ʱ�䲽����[J]  �������պ����ѧѧ��, 2006,V32(04): 387-390
Du Yongle, Yan Chao.Adaptive local time step method for DSMC code[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(04): 387-390
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I04/387
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