Analysis of the artificial viscosity in the smoothed particle hydrodynamics modelling of regular waves
Analysis of the artificial viscosity in the smoothed particle hydrodynamics modelling of regular waves
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DOI：
10.1080/00221686.2014.932853
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发表时间：
2014-11
影响因子：
2.3
通讯作者：
D. De Padova;R. Dalrymple;M. Mossa
中科院分区：
文献类型：
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作者：
D. De Padova;R. Dalrymple;M. Mossa
**摘要** 本文研究了人工粘性在六种不同规则波的光滑粒子流体动力学（SPH）计算中的影响。目的是改进对物理实际效应的建模，从而使SPH成为一种更具吸引力的建模选择。所提方法的要点是避免使用人工粘性中经验系数的不同值来运行模拟，以便为给定问题找到该参数的最优值。通过对数值数据和实验数据进行比较，对SPH的数值参数进行了全面校准。在涉及的各种参数中，光滑长度和粒子分辨率对结果的形成很重要。分析证实，当针对不同计算域确定了粒子间距与光滑长度的比率以及有用的粒子分辨率时，经验系数仅取决于以伊里巴伦数表示的破波类型。
ABSTRACT This paper considers the effect of artificial viscosity in smoothed particle hydrodynamics (SPH) computations of six different regular waves. The purpose is to improve the modelling of physically real effects and thereby make SPH a more attractive modelling option. The essence of the proposed method is to avoid running the simulation with different values of the empirical coefficient used in artificial viscosity in order to find the optimum value of this parameter for a given problem. Thorough calibration of the SPH's numerical parameters is performed through the comparison between numerical and experimental data. Among the various parameters involved, the smoothing length and the particle resolution are important in shaping the results. The analysis confirms that when the ratio of particle spacing to smoothing length and the particle resolution useful for different computational domains have been defined, the empirical coefficient depends only on the type of wave breaking in term of the Irribarren number.