The overlapping particle technique for multi-resolution simulation of particle methods
The overlapping particle technique for multi-resolution simulation of particle methods
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DOI：
10.1016/j.cma.2017.06.030
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发表时间：
2017-10
影响因子：
7.2
通讯作者：
K. Shibata;S. Koshizuka;T. Matsunaga;I. Masaie
中科院分区：
文献类型：
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作者：
K. Shibata;S. Koshizuka;T. Matsunaga;I. Masaie
详细介绍了粒子方法中的多分辨率技术——重叠粒子技术（OPT）。OPT表示一个完整的模拟域，其中部分重叠的子域具有各自的空间分辨率和粒子形状。例如，OPT允许我们将细球形粒子的子域与粗椭球粒子的子域连接起来。子域通过映射和入口-出口边界进行双边耦合。此外，还增加了减少总流体质量误差的技术，将OPT应用于运动粒子半隐式（MPS）方法、显式运动粒子模拟（EMPS）方法和光滑粒子流体力学（SPH）。对OPT进行了验证和验证分析。结果表明，OPT可以减少粒子模拟所需的粒子数量和计算时间，同时保持粒子模拟的鲁棒性。结果表明，对于大多数工程问题，总流体质量的误差是足够小的。
A multi-resolution technique for particle methods, the overlapping particle technique (OPT), is explained in detail. The OPT expresses a whole simulation domain with partially overlapping sub-domains with their own spatial resolutions and particle shape. For, example, the OPT allows us to connect a sub-domain of fine spherical particles with a sub-domain of coarse ellipsoidal particles. Sub-domains are bilaterally coupled by mapping and inlet–outlet boundaries. Techniques for reducing error of the total fluid mass were also newly added to the OPT. The OPT was applied to the moving particle semi-implicit (MPS) method, the explicit moving particle simulation (EMPS) method, and smoothed particle hydrodynamics (SPH). Verification and validation analyses of the OPT were carried out. As a result, the OPT was shown to reduce the required number of particles and the computational time of particle simulations while maintaining the robustness of particle simulations. It was also shown that the error of the total fluid mass was sufficiently small for most engineering problems.