Numerical simulation for sediment transport using MPS-DEM coupling model
Numerical simulation for sediment transport using MPS-DEM coupling model
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DOI：
10.1016/j.advwatres.2017.08.007
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发表时间：
2017-08
影响因子：
4.7
通讯作者：
E. Harada;H. Gotoh;H. Ikari;Abbas Khayyer
中科院分区：
文献类型：
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作者：
E. Harada;H. Gotoh;H. Ikari;Abbas Khayyer
冲冲波和反冲波之间的相互作用在冲刷带周围形成了一个复杂的水面，波浪破碎。透水滩涂表面的入渗和渗漏对底面剪应力有显著影响。干河床上冲波引起的底部剪应力突变对泥沙通量的估算有重要影响。为了高精度地模拟具有破碎波和复杂动床边界的沿海岸方向的剧烈流动，采用基于移动粒子半隐式（MPS）方法的增强粒子法求解波浪运动，采用离散元法（DEM）进行动床模拟。因此，与以往的实验结果相比，MPS-DEM耦合模型在模拟冲滩过程中具有很高的潜力。此外，引用尼尔森修正盾构数，说明了渗流在冲滩过程中的意义。
Interactions between the uprush and backwash waves around a swash zone cause a complex water surface with wave breaking. Infiltration and exfiltration on a permeable beach face produce significant effects on the bottom shear stress. Abrupt changes of the bottom shear stress induced by uprush waves onto a dry bed have a significant impact on the estimation of sediment flux. In order to simulate, with a high degree of accuracy, a violent flow with wave breaking and complex moving bed boundaries along the on-off shore direction, wave motions are solved by using an enhanced particle method based on the MPS (Moving Particle Semi-implicit) method, while the DEM (Discrete Element Method) is used for a movable bed simulation. Consequently, the high potential of a MPS-DEM coupling model to simulate the swash beach process is clearly demonstrated by comparison with previous experimental results. Furthermore, the significance of the seepage flow in the swash beach process is shown with referring the Nielsen's modified Shields number.