A new kernel function for SPH with applications to free surface flows

A new kernel function for SPH with applications to free surface flows
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SPH 的新核函数及其在自由表面流中的应用

DOI:
10.1016/j.apm.2013.12.001
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发表时间:
2014-08
影响因子:
5
通讯作者:
M.B. Liu
M.B. Liu
中科院分区:
工程技术2区
文献类型:
--
作者:
X.F. Yang;S.L. Peng;M.B. Liu

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光滑粒子流体力学(SPH)是一种流行的无网格拉格朗日粒子方法,它使用核函数进行数值逼近。核函数与SPH方法的计算精度和稳定性密切相关。本文提出了一种新的由两个余弦函数组成的核函数,称为双余弦核函数。新提出的双余弦核函数具有足够的光滑性,并与可调的支持域相关联。它也有更小的二阶动量,因此它在核近似方面有更好的精度。采用该双余弦核函数的SPH方法,模拟了水平圆柱溃坝及入水过程。所得的SPH结果与实验结果吻合较好。对双余弦核函数与常用的两种SPH核函数高斯核函数和三次样条核函数进行了比较研究。
Smoothed particle hydrodynamics (SPH) is a popular meshfree Lagrangian particle method, which uses a kernel function for numerical approximations. The kernel function is closely related to the computational accuracy and stability of the SPH method. In this paper, a new kernel function is proposed, which consists of two cosine functions and is referred to as double cosine kernel function. The newly proposed double cosine kernel function is sufficiently smooth, and is associated with an adjustable support domain. It also has smaller second order momentum, and therefore it can have better accuracy in terms of kernel approximation. SPH method with this double cosine kernel function is applied to simulate a dam-break flow and water entry of a horizontal circular cylinder. The obtained SPH results agree very well with the experimental results. The double cosine kernel function is also comparatively studied with two frequently used SPH kernel functions, Gaussian and cubic spline kernel functions.
DOI: 10.1201/9781315373140-19
发表时间: 2016-11
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影响因子: --
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