Efficient local smoothed particle hydrodynamics with precomputed patches
Efficient local smoothed particle hydrodynamics with precomputed patches
复制标题
具有预先计算的补丁的高效局部平滑粒子流体动力学
DOI：
10.1080/00207160.2018.1425799
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
Susumu Nakata
中科院分区：
文献类型：
--
作者：
Yasutomo Kanetsuki;John C. Wells;Susumu Nakata
本文提出了一种改进的方法，用于在流体粒子的嵌套拉格朗日区域内应用光滑粒子流体动力学。在我们以前的实现中，通过泊松圆盘采样产生的幽灵粒子包围了流体粒子占据的区域，将必要的物理量从外部区域转移到流体中。利用这种方法，在整个区域内的局部流体运动与SPH模拟的结果相吻合。然而，产生幽灵粒子的成本是沉重的。我们在这里提出了一种成本低得多的、基于面片的采样方法来生成重影粒子。在这种新的方法中，在每个流体粒子周围局部地生成重影粒子，并使用局部重影粒子来确定相应的物理量。此外，我们引入了一种新的公式，它从外部区域确定幽灵粒子的物理量，并将它们转移到局部流体粒子。
This paper presents an improved method for applying smoothed particle hydrodynamics within a nested Lagrangian domain of fluid particles. In our previous implementation, ghost particles, generated by Poisson-disk sampling to enclose the region occupied by fluid particles, transferred necessary physical quantities from the outer domain to the fluid. Using this technique, the local fluid motion agreed with results simulated by SPH over the entire domain. However, the cost of generating ghost particles was burdensome. We propose herein a much less expensive, patch-based sampling method to generate ghost particles. In this new approach, the ghost particles are generated locally around each fluid particle and corresponding physical quantities are determined using the local ghost particles. Furthermore, we introduce a new formulation that determines the physical quantities of ghost particles from the outer domain, and transfers them to the local fluid particles.