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arXiv 2008.01326physics.comp-phphysics.flu-dyn
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自由表面流动的具有自适应空间分辨率的光滑粒子流体动力学(SPH-ASR)

Smoothed particle hydrodynamics with adaptive spatial resolution (SPH-ASR) for free surface flows

Xiufeng Yang, Song-Charng Kong, Moubin Liu, Qingquan Liu

摘要:

发展了一种基于空间分辨率自适应光滑粒子流体动力学(SPH-ASR)的自由表面流动数值模拟方法。该方法在保证数值精度的前提下,减少了计算量.在该方法中,通过数值粒子分裂和合并,空间分辨率根据到自由表面的距离自适应地变化。当粒子靠近自由表面时,它们被分裂以细化,而当它们远离自由表面时,它们被合并以粗化。一种搜索算法,用于识别在自由表面的颗粒。采用变平滑长度的粒子移动技术改善粒子分布。通过模拟不同的自由表面流动,验证了SPH-ASR方法的有效性,并将计算结果与均匀空间分辨率(USR)SPH方法和实验数据进行了比较。

英文摘要:

A numerical method based on smoothed particle hydrodynamics with adaptive spatial resolution (SPH-ASR) was developed for simulating free surface flows. This method can reduce the computational demands while maintaining the numerical accuracy. In this method, the spatial resolution changes adaptively according to the distance to the free surface by numerical particle splitting and merging. The particles are split for refinement when they are near the free surface, while they are merged for coarsening when they are away from the free surface. A search algorithm was implemented for identifying the particles at the free surface. A particle shifting technique, considering variable smoothing length, was introduced to improve the particle distribution. The presented SPH-ASR method was validated by simulating various free surface flows, and the results were compared to those obtained using SPH with uniform spatial resolution (USR) and experimental data.

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