水利水电科技进展2018，Vol.38Issue(3)：81-87,7.DOI:10.3880/j.issn.1006-7647.2018.03.0015
桥墩局部冲刷动态模拟及不同截面的冲刷特性
Dynamic simulation of local scour around bridge piers and scouring characteristics of piers with different cross sections
摘要
Abstract
To obtain the time evolution of the local scour of bridge piers and to explore the scouring characteristics of piers with different cross sections,the user-defined function and the dynamic mesh updating technique of the computational fluid dynamics software FLUENT were used. The bed shear stress considering the enhancement effect of turbulence vortex and the critical shear stress considering the influence of the bed slope were calculated to obtain the sediment transport rate. The dynamic variation of bed topography with time was achieved by the relationship between sediment transport rate and bed elevation. Simulation distortion and numerical instability caused in the condition that the bed slope is greater than the sediment repose angle can be overcome through the adjustment of sediment collapse. It shows that the maximum scour depth,the shape of the scour hole and the flow structures by numerical simulation are in good agreement with the experimental results. With the same maximum pier width,the scour depth of the streamlined piers is about 45% and 40% lower than that of the round-ended piers and the sharp-nosed piers respectively, and the range of the scour hole is also reduced.关键词
桥墩/局部冲刷/数值模拟/动网格/截面形式Key words
bridge piers/local scour/numerical simulation/dynamic mesh/cross section shapes分类
交通工程引用本文复制引用
王飞,姚磊华,张彬,齐剑峰,李秀芬..桥墩局部冲刷动态模拟及不同截面的冲刷特性[J].水利水电科技进展,2018,38(3):81-87,7.基金项目
国家自然科学基金(41572301) （41572301）
河北省自然科学基金(D2017403020) （D2017403020）
中央高校基本科研业务费专项(2-9-2015-071) （2-9-2015-071）
