Three-Dimensional Numerical Model with Free Water Surface and Mesh Deformation for Local Sediment Scour
Three-Dimensional Numerical Model with Free Water Surface and Mesh Deformation for Local Sediment Scour
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DOI：
10.1061/(asce)0733-950x(2008)134:4(203
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
Xiaofeng Liu;Marcelo H. García
中科院分区：
文献类型：
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作者：
Xiaofeng Liu;Marcelo H. García
建立了具有自由面和自动网格变形的局部泥沙冲刷数值模型，并将数值计算结果与试验结果进行了比较。对于湍流闭合，使用两方程k-e模型。采用不同的方法捕捉了区域内的两个界面（水和空气、水和沉积物）。自由表面的流动模拟与流体体积（VOF）计划，这是一个欧拉方法。提出了一种新的VOF格式，以减少计算时间，同时保持相对精度。水-沉积物界面（床）的行为是用移动网格方法（拉格朗日方法）捕获的。流场与泥沙输移（包括推移质和悬移质）耦合使用准稳定的方法。使用当前模型已经获得了良好的结果。流场与实验中观察到的流场相似。冲刷模式也与实验数据相似。需要大量的计算时间来...
A numerical model for local sediment scour with free surface and automatic mesh deformation is constructed and numerical results are compared with experimental results. For the turbulence closure, the two equation k–e model is used. Two interfaces (water and air, water and sediment) in the domain are captured with different approaches. The free surface of the flow is simulated with the volume of fluid (VOF) scheme, which is an Eulerian approach. A new method for the VOF scheme is proposed to reduce the computational time while retaining relative accuracy. The behavior of the water-sediment interface (bed) is captured with a moving-mesh method, which is a Lagrangian approach. The flow field is coupled with sediment transport (both bed load and suspended load) using a quasi-steady approach. Good results have been obtained using the current model. The flow field is similar to the one observed in experiments. Scour patterns are similar to the experimental data as well. Large computational times are needed for...