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该文利用数值模拟手段探究明渠流动条件下单圆墩阻水效应特征。数值模型基于商用软件Fluent的气、水两相流模块,自由液面的捕捉选取VOF模型。通过分析明渠水流中单墩柱放置前后局部水位差,建立了阻水效应特性与流态因子之间的关系式。定量分析了墩柱阻水效应的空间影响范围及阻水强度,同时通过系列数值实验率定了单圆墩阻水系数经验公式hw* (y*)= Ae?(y*/B)2中的A、B参数,该经验公式由作者通过物理模型实验获得。研究成果可为大尺度河流水动力模拟中桥梁墩柱的概化提供一定参考依据。
In this paper, numerical simulation is used to explore the water blocking effect of single circular piers under open channel flow conditions. The numerical model is based on the commercial software Fluent gas and water two-phase flow module, the free surface of the capture select VOF model. By analyzing the local water level difference before and after placing the single pier in the open channel flow, the relationship between the water blocking effect and the fluid factor is established. The spatial influence range and water-proofing strength of pier water blocking effect are quantitatively analyzed. At the same time, the empirical formula hw * (y *) = Ae? (Y * / B) 2 A, B parameters, the empirical formula obtained by the author through the physical model experiment. The research results can provide reference for the generalization of bridge pier in large-scale river hydrodynamic simulation.