关于约束大涡模拟方法的一些思考

Some thoughts on constrained large-eddy simulation method

高雷诺数壁湍流是工程设计和应用中非常重要的问题之一,其高效高精度的模拟方法一直是湍流研究的重要研究方向。约束大涡模拟方法(CLES)是近些年提出的新模拟方法之一,和传统的RANS/LES混合方法不同,CLES在全场做LES计算:在靠近壁面的内区,它采用带约束的亚网格模型,而在外区,它使用传统的亚网格模型。经过近10年的努力,CLES方法已经在不可压/可压缩附着流、不可压缩/可压缩分离流等经典算例中得到了验证,并成功应用于航空气动中复杂流动的模拟。本文在介绍CLES方法基本原理的基础上,对CLES方法应用中的一些问题进行了讨论,最后对CLES方法的未来研究方向也做了一些概括。

Wall-bounded turbulence at high Reynolds numbers is one of the most important problems in engineering design and applications,and its high efficiency and high precision simulation method has always been one of the most important research realms in turbulence research.Constrained large eddy simulation(CLES)is one of the new simulation methods proposed in recent years.Differently from the traditional hybrid RANS/LES method,the CLES method performs a LES calculation in the whole field.In the inner region near the wall,it uses the constrained subgrid-scale model,while in the outer region,it uses the traditional subgridscale model.With nearly 10 years’ efforts,the CLES method has been verified in incompressible/compressible attached wall-bounded flows and incompressible/compressible separated flow.Further-more,it has also been successfully used to simulate the complex flows in the aviation field.In this paper,the basic principle of the CLES method will first be reviewed,followed by some discussions on the CLES implementations.Finally,some possible future research directions on the CLES method are summarized.