CFD方法研究桥梁断面三分力系数的雷诺数效应

Reynolds number effect of three component coefficients in bridge deck using computational fluid dynamics(CFD)

采用计算流体力学(CFD)方法计算与风荷载相关的物理量,应用FLUENT软件,对2种典型桥梁断面的三分力系数随雷诺数的变化进行数值模拟计算。建立了实际尺度的模型,选择了合理的网格划分形式,并分别使用3种不同的湍流模型,将数值计算结果与风洞试验结论进行了对比。结果表明:计算流体力学方法可以按照实际尺寸进行计算,以避免风洞试验只能进行缩尺试验的不足;且成本低、速度快、资料完备,具有模拟真实和理想条件的能力。

This paper used CFD to calculate the physical parameters correlated to wind load on bridge,discussed the variation of three component coefficients with Reynolds number based on two typical bridge sections with FLUENT software for numerical simulation,established actual scale models,by selecting reasonable type of meshing form.Three different turbulence models were used in the analysis,the numerical calculation results were compared with the one of wind tunnel test.The results show that CFD can be used to calculate bridge sections with actual size so as to avoid the insufficient of scale model in wind tunnel test.The calculation has the characteristic of low cost,high speed and complete materials,which can provide a platform to simulate the real and ideal condition.7 tabs,6 figs,15 refs.