SPH computation of plunging waves using a 2‐D sub‐particle scale (SPS) turbulence model
SPH computation of plunging waves using a 2‐D sub‐particle scale (SPS) turbulence model
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DOI：
10.1002/fld.1165
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发表时间：
2006-07
影响因子：
1.8
通讯作者：
Songdong Shao;Chang-ming Ji
中科院分区：
文献类型：
--
作者：
Songdong Shao;Chang-ming Ji
本文提出了一种二维大涡模拟（LES）方法来研究俯冲波的特性。数值模型是基于光滑颗粒流体力学（SPH）方法。SPH是一种无网格拉格朗日粒子法，能够简单准确地跟踪大变形的自由曲面。采用Smagorinsky模型作为湍流模型，因为它简单有效。提出的2维SPH-LES模型应用于缓坡上的余弦波破落。计算结果与文献资料吻合较好。与k -ε模型的数值计算结果相比，计算得到的破碎波下湍流量与实验结果吻合得更好。SPH-LES计算结果的敏感性分析表明，湍流模型和空间分辨率在模型预测中都起着重要作用，亚粒子尺度（SPS）湍流的贡献随着粒径的细化而减小。版权所有©2006约翰威利父子有限公司
The paper presents a 2‐D large eddy simulation (LES) modelling approach to investigate the properties of the plunging waves. The numerical model is based on the smoothed particle hydrodynamics (SPH) method. SPH is a mesh‐free Lagrangian particle approach which is capable of tracking the free surfaces of large deformation in an easy and accurate way. The Smagorinsky model is used as the turbulence model due to its simplicity and effectiveness. The proposed 2‐D SPH–LES model is applied to a cnoidal wave breaking and plunging over a mild slope. The computations are in good agreement with the documented data. Especially the computed turbulence quantities under the breaking waves agree better with the experiments as compared with the numerical results obtained by using the k–ε model. The sensitivity analyses of the SPH–LES computations indicate that both the turbulence model and the spatial resolution play an important role in the model predictions and the contributions from the sub‐particle scale (SPS) turbulence decrease with the particle size refinement. Copyright © 2006 John Wiley & Sons, Ltd.