基于V2F湍流模型的坡屋面体型系数研究

Study on Slope Roof Shape Factors Based on V2F Turbulence Model

在土木工程中,两方程k-ε系列湍流模型在结构风荷载模拟中有着广泛的应用。但是这些湍流模型都需结合壁面函数使用,从而使得在壁面附近以及钝体转角处计算精度不高。该文在Open FOAM平台上,基于V2F湍流模型对低矮坡屋面风场进行数值模拟,研究坡屋面体型系数的变化规律。经过非线性修正的V2F湍流模型在壁面附近及钝体转角处都有很高的计算精度,并可以不再使用壁面函数。通过对坡屋面体型系数的模拟,分析了地貌、湍流强度对体型系数的影响,并与规范进行了对比。该文最后还研究了坡屋面建筑之间的干扰效应及其对体型系数的影响,为工程设计提供了参考。

The 2-equation k-ε serial turbulence model is extensively applied in the structural wind load simulation in civil engineering. However, these turbulence models all need to be used in combination with wall functions, causing low computational accuracy near wall surfaces and at the corners of blunt bodies. This paper studies the change rules of slope-roof shape factor based on the numerical simulation of low slope roofs wind field by V2F turbulence model and on the platform ofOpenFOAM. V2F turbulence model of non-linear revision presents high computational accuracy near wall surfaces and at the corners of blunt bodies, and the wall function is no longer needed. Through the simulation of slope roof shape coefficient, it analyzes the influence of terrain, turbulence intensity to the shape coefficient, and the analysis result is compared with the standard values. This paper also provides the interfering effect among slope-roof buildings, and the influence to shape coefficient, which is for the reference of engineering design.