基于间断有限元方法的可压缩混合层中大尺度结构和压缩性效应的数值模拟研究（英文）  

Numerical Simulation of Large Scale Structures and Compressibility Effect in Compressible Mixing Layers with a Discontinuous Galerkin Method

作　　者：时晓天[1] 王伟[1] 张桂茹[1] 王铁进[1] 舒其望[2] 

机构地区：[1]中国航天空气动力技术研究院 [2]布朗大学,罗得岛州美国普罗维登斯市02912

出　　处：《空气动力学学报》2016年第2期224-231,共8页Acta Aerodynamica Sinica

基　　金：Supported by the National Natural Science Foundation(No.11302213)

摘　　要：基于间断有限元方法(DGM),对二维和三维、对流马赫数Mc=0.4和0.8的空间发展的可压缩混合层进行了数值模拟,并对混合层中的大尺度结构及压缩性效应进行了研究。重点观察了大尺度结构随压缩性变化的全景图像,文中采用λ2方法定义三维流动中的大尺度结构,流场中能够观察到大尺度的涡结构森林。当前数值模拟表明混合层的湍动能和雷诺应力随对流马赫数的增加而降低,这对RANS和LES模型的建立具有一定的参考意义。本研究也表明,间断有限元方法能够成功地应用于可压缩湍流的数值模拟。Large scale structures in two or three dimensional spatially developing compressible mixing layers,as well as compressibility effect in supersonic mixing layers under the convective Mach number Mc=0.4 and Mc=0.8 respectively are numerical studied with a discontinuous Galerkin method.Special attention is paid on the panorama of spatial evolution of large scale structures and the compressibility effect.Theλ2 structure extraction method is utilized in this paper,the ＂forest＂ structures are evident.The turbulence and Reynolds stress of the mixing layers are found decreasing with Mc in current simulations,which is expected to offer useful guidance for turbulent modeling in RANS and LES.The current study also shows the success of discontinuous Galerkin method to do compressible turbulence simulation.

关 键 词：间断有限元方法 超声速混合层 大尺度结构 压缩性效应 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]