基于VOF法的风暴潮洪水演进三维数值模拟

为了提高风暴潮灾害应急处置能力,确保防潮安全,文章建立了耦合流体体积函数(VOF)法的三维非稳态水气两相流k-ε模型,采用等效糙率的方法处理城市密集建筑群,既考虑了其阻水作用,又考虑了其蓄水作用。针对天津市滨海新区海河与永定新河之间区域的风暴潮洪水演进数值模拟与分析,对100年一遇风暴潮洪水淹没情况进行分析,并对不同频率的风暴潮洪水的严重性进行了比较。结果表明,随着风暴潮发生频率的增加,风暴潮淹没范围逐渐减小,水深随着频率的增加是逐渐减少的,该研究为海堤安全管理、风暴潮灾害的快速科学评估提供了理论依据和技术支持。

Three dimensional numerical simulation of floodwater evolution with storm surge based on VOF method

In order to enhance the ability of emergency response to storm surge disaster and ensure moistureproof safety,the 3D unsteady k-ε model coupled with the volume of fluid(VOF) method of water-air two-phase flow is established.The model adopts the method of equivalent roughness to deal with urban intensive building groups,in which the effect of water resistance and water storage are both taken into consideration.One hundred years frequency storm surge is analyzed based on the numerical simulation and analysis of floodwater evolution with storm tide between the Haihe River and the Yongdingxinhe River of the new coastal region of Tianjin.The severity of different frequencies of the storm surge are compared and analyzed.The results show that the flooded area and the water depth decrease with the increasing of storm surge frequency.The researches provide theoretical foundation and technical support for the safety management of the sea wall and scientific assessment of storm surge disaster.