| 张辉,谭俊杰,崔东明.非结构重叠网格方法研究及应用[J].计算力学学报,2010,27(1):162~168 |
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| 非结构重叠网格方法研究及应用 |
| Study and application of overset unstructured grid method |
| 投稿时间：2007-01-27 |
| DOI：10.7511/jslx20101027 |
| 中文关键词: 非结构重叠网格 动边界 动态八叉树搜索 插值 膛口流场 |
| 英文关键词:overset unstructured grids method moving boundary Dynamic Octree search algorithm interpolation muzzle flow field |
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| 摘要点击次数: 1803 |
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| 中文摘要: |
| 航空、航天和兵器技术等领域的研究中存在大量包含运动边界的流场。非结构重叠网格方法是一种高效的处理动边界问题的新方法。围绕相对运动的每个物体单独生成非结构网格,在网格重叠区域通过搜索和插值完成网格系之间的信息传递,提出了"动态八叉树"搜索算法,发展了绝对坐标系和相对坐标系相结合的流场求解方式,采用二阶精度Van Leer/Hanel格式和四阶Runge-Kutta法分别进行空间和时间离散,形成了一种新的非结构重叠网格算法。对三维Riemann问题的求解结果与精确解能很好吻合,证明了本文的重叠网格算法具有较好的时空离散精度和插值精度。对7.62mm步枪射击过程进行了数值模拟,描述了弹丸离开膛口后膛口流场的发展过程,与实验结果体现的发展过程较为吻合,验证了本文提出的非结构网格算法体系具有较好的计算性能,是研究含动边界复杂流场的一种有效手段。 |
| 英文摘要: |
| There are many moving boundary problems in aeronautics, astronautics and weapon technology researches. Overset unstructured grid method is an efficient new approach to solve the problems which contain moving bodies. The first step of this method is to generate grids around the moving objects respectively. The second step is to transfer the flow field parameters by searching and interpolation between the pieces of grids in the overlapped areas. A "Dynamic Octree" search algorithm was advanced based to search the donor cells of the nodes which locate on the hole-boundaries. Applied the mode of solving the flow field by integrating inertial and relative coordinates in the overset unstructured grids method. Used the second order Van Leer／Hanel method and fourth order Runge-Kutta method to solve the 3D Euler equations. The simulation results of the 3D Riemann problem conform to the exact results fairly well. The method advanced in this paper is proved to be suitable to solve the problems which contain shock waves. The forming process of muzzle flow field after the bullet separated from the muzzle of 7.62 mm gun was simulated. The results show the process of a bullet fling through the muzzle flow field, and accord with the experimental results very well. The overset unstructured grids method developed in this paper is proved efficient and accurate to solve the moving boundary problems. |
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