Numerical investigation of local scour around tandem piers using proposed self-sustaining inlet turbulent boundary conditions
Numerical investigation of local scour around tandem piers using proposed self-sustaining inlet turbulent boundary conditions
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DOI：
10.1016/j.oceaneng.2023.113987
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发表时间：
2023-04
影响因子：
5
通讯作者：
YU Peng;Junfeng Liu;Lien-Tsai Yu;Ling Zhu
中科院分区：
文献类型：
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作者：
YU Peng;Junfeng Liu;Lien-Tsai Yu;Ling Zhu
紊流特性对串列墩局部冲刷的数值模拟结果有重要影响。采用自维持模型快速生成均匀的各向同性湍流，以保持数值流场和物理流场的一致性。采用与标准k-ε湍流模型接近的雷诺平均N-S方程，对桥墩周围复杂的流场进行了数值模拟。采用泥沙输移模型，结合动网格更新方法，模拟了连排墩局部冲刷的演变过程。结果表明，最大冲刷深度出现在上游桥墩处，且两桥墩中心距离（L/D）不同。当L/D= 4时，最大冲刷深度达到最大值，当L/D= 2时，最大冲刷深度达到最小值。当L/D> 5时，下游桥墩的屏蔽效应可以忽略。此外，基于数值模拟结果，建立了一种基于孤立墩冲刷深度快速预测局部冲刷深度的方法，可为桥梁、海上风机等结构基础的抗冲设计提供参考。
Turbulent characteristics significantly affect the numerical results of local scour in tandem piers. The novel self-sustaining model was used to quickly develop homogeneous isotropic turbulence to maintain the consistency of the numerical and physical flow fields. The Reynolds averaged N-S equations, which are close to the standard k− ε turbulence model, were employed to solve the complex flow field around the bridge piers. The sediment transport model, combined with dynamic mesh updating methods, simulated the evolution process of the local scour for tandem piers. The results indicated that the maximum scour depth occurred at the upstream pier at different distances between the centres of the two piers (L/D). The scour depth reached its largest value when L/D= 4, and the maximum scour depth reached its minimum value when L/D= 2. When L/D> 5, the shielding effect can be neglected for downstream piers. In addition, based on the numerical simulation results, a shielding coefficient was established, providing a method for quickly predicting the local scour depth based on the scour depth of the isolated pier and a reference for the scour resistance design of bridges, offshore fans, and other structural foundations.