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首页> 外文期刊>Ocean dynamics >The simulation of sediment transport and erosion caused by free-surface flow based on two-phase SPH model with the improved Shields criterion
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The simulation of sediment transport and erosion caused by free-surface flow based on two-phase SPH model with the improved Shields criterion

机译：基于改进盾牌准则的两相SPH模型模拟自由表面流引起的泥沙输移和侵蚀

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摘要

In this paper, a two-phase model based on the SPH method is established using the Newtonian fluid and non-Newtonian fluid to describe water and sediment respectively. In this model, the Oldroyd-B constitutive model and the modified Shields criterion by sediment thickness and sediment interface slope are used to predict sediment transport and erosion caused by free-surface flow. The drag force of the water flow on the sediment is also considered. In addition, a series of correction techniques, including the kernel gradient correction technique, density re-initialization, treatment of solid boundary, and velocity correction technique, has been used. The dynamic processes of sediment transport and erosion under three different scouring conditions are simulated and analyzed by the two-phase model. Compared with the simulated and/or experimental results from earlier studies, the results show that the two-phase SPH model can capture the principal phenomena of sediment transport and erosion caused by free-surface flow.
机译：本文分别利用牛顿流体和非牛顿流体建立了基于SPH方法的两相模型来描述水和沉积物。该模型采用Oldroyd-B本构模型和修正的Shields沉积物厚度和沉积物界面坡度准则来预测自由表面流动引起的沉积物输送和侵蚀。还考虑了水流对沉积物的阻力。此外，还使用了一系列校正技术，包括核梯度校正技术、密度重初始化技术、固体边界处理和速度校正技术。采用两相模型模拟分析了3种不同冲刷条件下泥沙输移和侵蚀的动态过程。与前期研究的模拟和/或实验结果相比，结果表明，两相SPH模型能够捕捉到自由表面流动引起的泥沙输送和侵蚀的主要现象。

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