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中文摘要：
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。
英文摘要：
On the basis of the wind resistant performance research on the windshield barrier of Xiangshan Bay Bridge,the wind-speed reducing effects of curve windshield barrier with different porosity ratios and under different wind attack angles,are numerically simulated by the two dimensional RNG k-ε turbulence model.The result shows that： the question about the unsteady flow pass around the bluff bridge deck with curve windshield barrier can be successfully calculated by the RNG k-ε turbulence model;the wind-speed reducing effect of curve wind barrier is related with the porosity ratio,the wind attack angle and the height of the windshield barrier.Moreover,by the analysis of the wind profile at the middle of the different lanes and the wind speed reduction factor variation pattern,we can know that： the wind-speed reducing effect of windshield barrier is decreased linearly while the wind attack angle alters from minus to plus,and is more significant at the leeward lanes than that at windward lanes.Besides,with the increase of the porosity ratio,the wind-speed reducing effect dose not represent as linearly variation but trends to stable value in the certain extent of the porosity ratio,which can be used to determine the optimal porosity ratio.
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