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以象山港大桥风障性能研究为背景,采用二维RNG k-ε湍流模型对不同透风率不同风攻角下曲线风障的减风效果进行了数值模拟。通过数值模拟表明:RNG k-ε湍流模型能成功地模拟设置了曲线风障的桥梁断面非定常绕流问题;桥梁风障减风效果与透风率大小、来流风攻角以及风障高度有密切关系。此外分析车道中心线处风剖面和风速折减系数变化曲线知道:风障减风效果大小随着风攻角由负变为正成线性下降趋势并且下游车道受风攻角的影响更为显著;但是风障减风效果并非随着透风率的增大呈线性变化趋势,而是在某一透风率范围内,风障减风效果趋于稳定,通过这一现象可以确定最优风障透风率大小。
Based on the study of the wind-induced wind performance of Xiangshangang Bridge, the two-dimensional RNG k-ε turbulence model is used to simulate the wind-reducing effect of the wind-induced wind wave with different wind-penetration rates under different wind-attack angles. Numerical simulations show that the RNG k-ε turbulence model can simulate the unsteady flow around the bridge cross-section with a curved wind-induced failure. The effectiveness of the bridge wind-induced wind reduction is closely related to the ventilation rate, the angle of attack of the wind flow, relationship. In addition, the analysis of the wind profile at the centerline of the lane and the curve of the wind speed reduction coefficient shows that the effect of the wind-induced wind reduction decreases linearly with the wind-attack angle from positive to negative and the impact of the wind-down angle on the downstream lane becomes more significant. However, The wind-induced wind-reduction effect did not change linearly with the increase of the ventilation rate, but decreased within a certain range of ventilation rate, and the wind-induced wind reduction effect tended to be stable. By this phenomenon, the optimal wind-ventilation ventilation rate .