摘要
孤立式桥墩周围的局部冲刷一直是导致桥墩失稳的重要因素。国内外针对圆形墩柱周围的水流绕流流态及局部冲刷情况做了许多研究,但对大尺度墩柱的研究仍不完善。利用FLOW-3D三维模拟软件中大涡模拟紊流模型模块以及泥沙冲刷模块,对不同尺度的圆柱周边的局部冲刷进行系统模拟研究。计算结果表明,在不同圆柱直径下,圆柱的迎水侧、背水侧以及对称侧的平衡冲刷深度始终保持着特定的比例关系。同时,圆柱周围的最大冲刷深度随圆柱直径的增大而增大,但其与圆柱直径的比值随圆柱直径增大而减小,并呈现出收敛的趋势。期望数值模拟研究结果,能够较好地为预测实际工程中大尺度圆柱周围的冲刷坑深度及形态提供参考依据。
The local scour around an isolated pier has been an important factor leading to pier failure, and ithas been an important subject to study the sediment scour. A lot of research has been done on the flowcharacteristics and local scour around a circular pier, but the results on the large-scale cylinder is still not perfect.In this paper, the turbulence module of large scale simulation and sediment scour module of the three-dimensionalsimulation software FLOW-3D were used to simulate local scour around cylinders with different diameters. Theresults show that the equilibrium scour depth at the upstream side, downstream side and lateral side of the cylindershare steady ratios to the cylinder diameters. At the same time, the maximum scour depth around the cylinderincreases with the increase of the diameter of the cylinder, but the ratio of the maximum scour depth to the cylinderdiameter decreases and shows a trend of convergence. This numerical simulation study provides a reference forpredicting the depth and mmlohology of the scour pit around a large-scale cylinder for engineering practices.
作者
李绍武
杨航
LI Shao-wu;YANG Hang(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)
出处
《水道港口》
2018年第5期519-527,共9页
Journal of Waterway and Harbor
基金
国家自然科学基金项目(批准号51779170和51379143)
