摘要
基于Melville桥墩局部冲刷试验模型,采用FLOW-3D软件,利用大涡模拟方法模拟了桥墩绕流局部冲刷过程,通过分析冲刷坑形态、深度的变化过程,评价了Meyer-Peter和Van Rijn推移质输沙率公式在桥墩绕流局部冲刷模拟中的适用性,并结合两输沙率公式结构分析了模拟结果存在差异的原因。结果表明:大涡模拟方法能够有效模拟桥墩绕流的复杂流态,采用Meyer-Peter推移质输沙率公式的局部冲刷模拟结果较好,预测的冲刷坑形态更接近试验观测结果;当时间为30 min时,最大冲刷深度与试验观测结果相对误差为2.3%。采用Van Rijn推移质输沙率公式的预测结果相对较差,最大冲刷深度与试验观测结果相对误差为15.5%。
Based on bridge pier local scour experiment model by Melville, the large eddy simulation method based on Flow-3 D was used to simulate the processes of water flow and local scour around a bridge pier. The applicability of Meyer-Peter and Van Rijn bedload sediment transport rate formulas in the simulation of local scour around the pier were evaluated by analyzing the variation law of scour hole shape and depth over time. Combined with the structure of two sediment transport rate formulae, the mechanism for the difference in simulation results are analyzed. The results show that the large eddy simulation method can effectively predict the complex flow pattern around the pier. The local scour simulation results using Meyer-Peter bedload sediment transport rate formula is better, and the scour hole shape is agreement with the observation results by Melville, and when T=30 min, the relative error of maximum scour depth between the simulation and the observation results is 2.3%. The prediction results of Van Rijn bedload sediment transport rate formula was relatively poor, and the relative error between the maximum scour depth and the observation results is 15.5%.
作者
李安斌
张根广
Chandara Man
周双
LI An-bin;ZHANG Gen-guang;Chandara Man;ZHOU Shuang(Key Laboratory of Agriculural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northwest A&F University,Yangling 712100,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第3期15-22,共8页
Journal of Sediment Research
基金
国家自然科学基金项目(51879227
51279170)。
