双方程湍流模型在高雷诺数水翼绕流模拟中应用

Assessment of Two-equation Turbulence Modeling for Hydrofoil Flows at High Reynolds Number

为了研究不同湍流模型在水翼绕流数值模拟中的适用性,采用3种双方程湍流模型,对某二维水翼在高雷诺数(Re=7.0×105)下的无空化绕流进行了定常数值模拟。分析比较了标准k-ε模、RGN k-ε模型以及Realizable k-ε模型结合不同近壁区处理方式所得模拟结果的差异。通过SIMPLEC算法实现速度、压力的分离求解,离散差分格式具有二阶精度。结果表明,Realizable k-ε湍流模型结合增强型壁面函数法所得翼型绕流速度分布与实测值最为接近。

An evaluation of the capability of turbulence models for their application to hydrofoil steady flow at high Reynolds numbers was presented. Three widely applied two-equation RANS turbulence models were assessed by means of comparison with experimental data at Reynolds numbers of 7.0× 10^5. They were the standard k -ε model, the RNG k -ε model and the realizable k - ε model. The SIMPLEC algorithm was applied for the solution of the governing equations. It has been found that the realizable k -ε turbulence model used with enhanced wall functions and near-wall modeling techniques consistently provided superior performance in predicting the flow characteristics around the hydrofoil.