The simulation of sediment transport and erosion caused by free-surface flow based on two-phase SPH model with the improved Shields criterion
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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DOI：
10.1007/s10236-022-01497-w
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发表时间：
2022-01
期刊：
影响因子：
2.3
通讯作者：
Xiaojing Ma;Bowen Zhang;Jie Chen;Xinchao Zhou;Wei Chen
中科院分区：
文献类型：
--
作者：
Xiaojing Ma;Bowen Zhang;Jie Chen;Xinchao Zhou;Wei Chen
本文采用牛顿流体和非牛顿流体分别描述水和泥沙，建立了基于SPH方法的两相流模型。在该模型中，Oldrophil-B本构模型和修正的Shields准则的沉积厚度和沉积物界面坡度被用来预测泥沙输移和侵蚀引起的自由面流。还考虑了水流对泥沙的拖曳力。此外，还采用了一系列的校正技术，包括核梯度校正技术、密度重新初始化、固体边界处理和速度校正技术。采用两相流模型模拟分析了三种不同冲刷条件下的泥沙输移和冲刷动力过程。结果表明，两相SPH模型能较好地反映自由面水流引起的泥沙输移和冲刷的主要现象。
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.