基于壁模型大涡模拟的壁湍流问题研究  

Research on Wall-bounded Turbulence Using Wall-Modeled Large Eddy Simulation

作　　者：罗富强 于祥 邓锐 LUO Fuqiang;YU Xiang;DENG Rui(School of Marine Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China)

机构地区：[1]中山大学海洋工程与技术学院,珠海519082 [2]南方海洋科学与工程广东省实验室(珠海),珠海519082

出　　处：《中国造船》2024年第3期205-220,共16页Shipbuilding of China

基　　金：水路交通控制全国重点实验室开放课题基金项目(W24CG000073,SKLMTA-DMU2024Y1);国家自然科学基金项目(52171330,52101379,52101380)。

摘　　要：壁模型大涡模拟方法避免了直接求解壁面边界层黏性子层的巨大计算成本,使得大涡模拟在复杂壁面湍流问题中的应用具有可行性。论文采用基于OpenFOAM开发的壁模型大涡模拟求解模块,对不同雷诺数下充分发展的槽道流动和周期山绕流的壁湍流问题开展数值模拟,分析不同壁面模型、壁面网格分辨率对壁模型大涡模拟数值求解精度的影响。研究结果表明,相较于壁面解析大涡模拟,壁模型大涡模拟能在保持相当求解精度的前提下大幅降低计算中的网格成本。在充分发展的湍流问题中,平衡型壁面模型能取得较高的数值求解精度,但在涉及流动分离的壁湍流问题中,平衡型壁面模型求解精度不高,应采用计及流向压力梯度的非平衡型壁模型。The wall-modeled large eddy simulation(WMLES)approach avoids the enormous computational cost of resolving the flow in the viscous sublayer in turbulent boundary layers,making LES feasible for complex wall-bounded turbulence.This paper employs a solver of wall-modeled LES developed based on OpenFOAM to conduct numerical simulations on wall-bounded turbulence problems in the fully developed channel and flow around periodic hills.The study analyzes the influence of wall models and grid resolutions near the wall on numerical accuracy.The results indicate that compared to wall-resolved LES,WMLES can significantly reduce computational grid costs while maintaining comparable accuracy.In fully developed turbulent flows,equilibrium wall models can achieve high numerical accuracy,but in wall-bound turbulence problems with flow separation involved,equilibrium models do not perform well.In such cases,non-equilibrium wall models accounting for streamwise pressure gradients should be applied.

关 键 词：壁模型大涡模拟 壁湍流 OPENFOAM 槽道流 周期山绕流 

分 类 号：O352[理学—流体力学]