桥梁断面雷诺数效应数值模拟研究

针对大海带东桥引桥断面和苏通长江公路大桥主梁断面,基于确定性涡方法进行静三分力系数及Strouhal数(St)雷诺数效应分析,采用粒子强度交换法(PSE)粘性扩散处理.和风洞试验值对比显示,数值计算结果有着合理的可信度.数值计算也显示雷诺数对这两种截面的静三分力系数及St影响不可以忽略;对苏通桥主梁断面在雷诺数在1×10~5和1×10~6范围时,St数受雷诺数影响很大,而这个范围内用试验的值来得到实桥的St数是非常困难的.

Numerical simulation study on Reynolds number effect on bridge decks

In this paper, aerostatic coefficients, Strouhal number (St) and Reynolds number (Re) of Great Belt East Bridge and Sutong Bridge are investigated based on deterministic vortex method (DVM). In this method, particle strength exchange (PSE) is chosen to implement the simulation of the flow around bluff body and to analyze the microscopic mechanics of the static load and Reynolds number effect. Compared with the results obtained from wind tunnel tests, reliability of numerical simulation can be proved. Numerical results also show that the Reynolds number effect on aerostatic coefficients and St of the two bridges can not be neglected. In the range of Reynolds number from 1×10~5 to 1×10~6, it has great effect on St for Sutong Bridge. In this range, the Strouhal number is difficult to obtain from wind tunnel tests.