Developing Spline Based Overset Grid Assembling Approach and Application to Unsteady Flow Around a Moving Body
Developing Spline Based Overset Grid Assembling Approach and Application to Unsteady Flow Around a Moving Body
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DOI：
10.17265/2159-5291/2016.09.001
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
Hiroshi Kobayashi;Y. Kodama
中科院分区：
文献类型：
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作者：
Hiroshi Kobayashi;Y. Kodama
嵌套网格方法是科普复杂几何问题的方法之一。开发了一个基于样条函数的重叠网格拼接系统。该系统基于结构化网格方法，涵盖了覆盖装配的全面功能，即，网格生成、网格修改和计算域连通性信息（DCI）以用于重叠插值。Ferguson样条曲线用于通过网格点和单元中心计算曲线，以健壮和精确地修剪网格和计算DCI。采用拼接网格对集装箱船绕流进行了数值模拟，网格间流场具有良好的连续性。日本国立海事研究所也开发了动态重叠方法和求解器，将重叠网格组装增强为非定常问题。对上仰椭球体的计算结果与实测数据进行了比较，结果表明，作用在椭球体上的非定常力具有很好的一致性。实践证明，该系统具有模拟拼接网格绕流和动态重叠拼接非定常流动的能力。
Overset or Chimera grid approach is one of methods to cope with complex geometries. A spline based overset grid assembling system has been developed. The system is based on structured grid approach and covers comprehensive features for overset assembling, i.e., grid generation, grid modification, and computing Domain Connectivity Information (DCI) for overset interpolation. Ferguson spline curve is used to compute curves through grid points and cell centers for trimming grids and computing DCI robustly and accurately. Flow simulation around Kriso Container Ship (KCS) with jointed grids shows good continuity of flow field between the grids. The overset grid assembling is enhanced to unsteady problem as dynamic overset approach coupled with a solver which also has been developed in National Maritime Research Institute, Japan. Computed results for pitchup spheroid are compared with measured data and show good agreement in unsteady force acting on the spheroid. It is confirmed that the system has capability to simulate flow field around jointed grids and unsteady flow with dynamic overset assembling approach practically.