不同质量粒子分布SPH方法及其应用

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (22) : 62-67.

论文

不同质量粒子分布SPH方法及其应用

艾孜海尔•哈力克1, 2 ，热合买提江•依明2，开依沙尔•热合曼2，买买提明•艾尼1

作者信息 +

SPH METHOD WITH DIFFERENT MASS PARTICLE DISTRIBUTION AND ITS APPLICATION

Azhar Halik1, 2, Rahmatjan Imin2,Kaysar Rahman2, Mamtimin Geni1

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文章历史 +

摘要

光滑粒子流体动力学(SPH)方法是一种新发展起来的纯拉格朗日数值方法，其最大的优点是不需要对自由表面进行特殊处理，有利于模拟飞溅、破碎等高度非线性流。SPH方法的一个缺点是计算的时间复杂性高，因为需要大量粒子详细定义流体，使之计算时间相应增加。本文在核半径保持不变的情况下为了提高计算效率和精度提出不同质量粒子分布的方法，即在关键计算区域分布较小质量粒子，而在其它区域分布较大质量粒子。本文首先通过静水数值模拟，初步验证了此方法的有效性。之后，对半浸泡振荡圆筒所产生的小振幅水波进行了数值模拟。将数值模拟结果与已有的实验结果进行了对比分析。分析结果表明此方法能够明显提高计算精度的同时可以节省大量计算时间。

Abstract

The Smoothed Particle Hydrodynamics (SPH) method is a new developed pure lagrange numerical method, the major advantage of SPH is that no special treatment of the free surface is required, it is beneficial for simulating highly non-linear flows, e.g. to run up and splash around bodies. One drawback of the SPH method is that it has high computational time complexity associated with the large number of particles desirable for good flow definition. In this paper, to improve accuracy without substantially increasing computational time, a different mass particle distribution method is used for a pre-selected area where high resolution is desirable. The effectiveness of the proposed method is tested and verified with the still water problem. Then, surface waves generated by a heaving cylinder of different wave period and stroke is numerically simulated, and the simulation results are compared with the experimental data. Numerical results shows that using this method brings a significant improvement in accuracy without substantially increasing computational time.

导出引用

艾孜海尔?哈力克1, 2,热合买提江?依明2，开依沙尔?热合曼2，买买提明?艾尼1. 不同质量粒子分布SPH方法及其应用[J]. 振动与冲击, 2015, 34(22): 62-67

Azhar Halik1, 2, Rahmatjan Imin2,Kaysar Rahman2, Mamtimin Geni1 . SPH METHOD WITH DIFFERENT MASS PARTICLE DISTRIBUTION AND ITS APPLICATION[J]. Journal of Vibration and Shock, 2015, 34(22): 62-67

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