平面二维k-ε紊流模型不同壁函数的对比及研究

在平面二维紊流模型中壁函数起到连接流固的桥梁作用,克服了边界附近网格过密的困难,也是紊流模型应用中的一个重要环节,因此壁函数的选择对模型的模拟结果起着至关重要的作用。将3种不同形式的壁函数引入平面二维k-ε模型中,对丁坝绕流进行了数值计算,并将计算结果与实测数据进行了对比,从流场、流速、紊动动能分布及紊动耗散率等方面对3种壁函数进行优选验证,结果表明对数率壁函数优于其他两种形式的壁函数,其数值计算结果更接近实测数据。

Comparison and research on several wall functions in plane two-dimension k-ε turbulence model

In plane two- dimension k - ε turbulence model, the wall function has the effect of connecting the fluid and solid, overcoming the dense grid near the boundary, and it is the important link of turbulence model＇s application. In this paper, by introducing three different forms of wall functions into plane two- dimension k - ε turbulence model, numerical calculation of spur dike flow was carried out, and the calculation results and the measured data were compared. The three different forms of wall functions were optimized and verified from the aspects of flow field, velocity, kinetic energy and turbulence dissipation rate. The results show that the law of logarithm wall function is better than the other two forms.