湍流模型和壁面函数对室内空气流动数值模拟的影响

摘要

以室内有隔板的低雷诺数空气流动模型的试验数据为依据,利用ANSYS Fluent软件,比较了4种湍流统计模型(标准k-ε模型、可实现k-ε模型、重整化群k-ε模型和SST k-ω模型)及4种壁面函数(标准壁面函数、可伸缩壁面函数、非平衡壁面函数和增强型壁面函数)对室内空气时均流场的预测能力.结果表明,重整化群k-ε模型的预测效果相对最佳,但4种湍流模型的预测能力差别不显著,预测值与试验值均吻合较好.对于中等疏密度网格,标准壁面函数对网格和流动的适应性最好,预测能力最佳,而其他3种壁面函数的处理能力一般.%Based on the experimental velocity data of a model room with a panel under low Reynolds number condition,the effects of four turbulence models (the standard k-ε model, realizable k-ε model,RNG k-ε model and SST k-ω model)and four wall functions (the standard wall function,scalable wall function,non-equilibrium wall function and enhanced wall function)on indoor air flow simulations were compared using ANSYS Fluent software.The results show that all the four turbulence models can well predict the flow and the RNG k-ε turbulence model performs best,but the prediction difference among the four models is not significant.When adopting medium meshes,the standard wall function can give satisfactory results while the performances of other three wall functions are not very well.