| 高超声速飞行器DSMC／EPSM自适应当地时间步长混合算法 |
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| 引用本文： | 朱荣丽,曹义华.高超声速飞行器DSMC／EPSM自适应当地时间步长混合算法[J].空气动力学学报,2008,26(3). |
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| 作者姓名： | 朱荣丽 曹义华 |
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| 作者单位： | 北京航空航天大学航空科学与工程学院飞机设计研究所,北京,100083 |
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| 摘 要： | 采用优化的DSMC/EPSM混合算法,研究了高超声速飞行器三维复杂流场在近连续区的气动力热特性.发展了一种DSMC/EPSM自适应当地时间步长混合算法,根据网格内仿真分子的碰撞数,自动调整网格中进行仿真分子运动和碰撞计算的时间步长,有效地提高了程序的计算效率和计算精度.用DSMC方法、DSMC/EPSM混合算法和DSMC/EPSM自适应当地时间步长混合算法对比计算了三维复杂飞行器流场压力、热流分布量,飞行器表面气动力、热分布参数,证明了DSMC/EPSM自适应当地时间步长混合算法大幅度缩短了流场稳定所需的CPU时间,并且不降低流场模拟结果的精度.
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| 关 键 词： | DSMC数值模拟 三维流场 网格标识 分子碰撞 |
The hybrid code of adaptive local time step for DSMC/EPSM on the hypersonic vehicle |
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| ZHU Rong-li,CAO Yi-hua.The hybrid code of adaptive local time step for DSMC/EPSM on the hypersonic vehicle[J].Acta Aerodynamica Sinica,2008,26(3). |
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| Authors: | ZHU Rong-li CAO Yi-hua |
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| Abstract: | This publication described an approach for using a local time step within the DSMC method and an algorithm for the automatic adaptation of this time step allowed an appropriate resolution of the local collision frequency a control of the collision probabilities.The comparison of the code with and that without adaptive local time step new method showed that this method resulted in a significant reduction in the execution CPU time,but has no influence on the simulation resolution and the flow structure. |
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| Keywords: | DSMC numerical simulation three dimensional flow marking the cell molecules collide |
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