A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids
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一种基于对称粒子的大规模扩散流体模拟方案

DOI:
10.3390/sym10040086
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发表时间:
2018-03
期刊:
影响因子:
2.7
通讯作者:
Wang Xiaokun
Wang Xiaokun
中科院分区:
综合性期刊4区
文献类型:
--
作者:
Liu Sinuo;Ban Xiaojuan;Wang Ben;Wang Xiaokun

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提出了一种基于拉格朗日光滑粒子流体动力学(SPH)模型的扩散流体的对称粒子模拟方法。在我们的方法中,扩散粒子的产生是由流体粒子的熵决定的,它是由速度差和动能计算的。在漫射材料生成率大于零的合格漫射粒子发射器附近生成漫射粒子。我们的方法更符合物理定律,因为它放弃了经验性地在波峰处添加漫射材料的常见做法。扩散材料和流体之间的耦合是通过速度场实现的后处理步骤,这使得能够避免耗时的交叉查找邻居的过程。基于耦合度分配流体粒子的影响权重。从而提高了漫反射粒子位置的准确性,使模拟结果更加真实。该方法适用于大规模扩散流体,因为它可以很容易地集成到现有的SPH模拟方法和计算开销是可以忽略的。
We present a symmetric particle simulation scheme for diffuse fluids based on the Lagrangian Smoothed Particle Hydrodynamics (SPH) model. In our method, the generation of diffuse particles is determined by the entropy of fluid particles, and it is calculated by the velocity difference and kinetic energy. Diffuse particles are generated near the qualified diffuse particle emitters whose diffuse material generation rate is greater than zero. Our method fits the laws of physics better, as it abandons the common practice of adding diffuse materials at the crest empirically. The coupling between diffuse materials and fluid is a post-processing step achieved by the velocity field, which enables the avoiding of the time-consuming process of cross finding neighbors. The influence weights of the fluid particles are assigned based on the degree of coupling. Therefore, it improved the accuracy of the diffuse particle position and made the simulation results more realistic. The approach is appropriate for large scale diffuse fluid, as it can be easily integrated in existing SPH simulation methods and the computational overhead is negligible.
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