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为研究近床面结构物周围的局部冲刷问题,该文基于N-S方程和有限体积法,在FLUENT中进行二次开发,建立了局部冲刷问题的三维通用计算模型。模型通过标准k-?模型计算结构物周围的流场,并使用FLUENT软件中的自定义函数功能,提取床面网格信息与床面剪应力。据此来计算一段时间内的推移质输沙率,进而得到床面节点的高程变化。最后,再通过动网格技术,更新床面网格形状,完成一个时间步长的床面变形计算。该文模拟了水平管道周围冲刷与圆球附近的冲刷,计算结果与实验结果吻合良好,验证了模型的准确性。同时,该研究讨论了流动与冲刷时间步长的选取对计算效率与计算精度的影响。
In order to study the local erosion around the near-surface structure, a three-dimensional generalized calculation model of local scour problem is established based on N-S equation and finite volume method in FLUENT. The model calculates the flow field around the structure through a standard k-模 model and uses the function of a custom function in FLUENT software to extract the information of the bed meshes and the bed shear stress. Based on this, the sediment transport rate over a period of time is calculated, and the elevation change of the bed node is obtained. Finally, through the moving grid technology, the shape of the bed surface is updated to complete the calculation of the bed surface deformation in a time step. The paper simulates the scour around the horizontal pipe and the scour near the sphere. The calculated results are in good agreement with the experimental results, which proves the accuracy of the model. At the same time, this study discusses the influence of the choice of flow and scour time steps on computational efficiency and computational accuracy.