混合型三阶格式及关于两种DES算法的比较计算研究  

A hybrid third order scheme and the comparative investigations on two DES methods by computations

作　　者：孙东[1] 陈江涛[1] 李沁[1,2] 张涵信[1,2] 

机构地区：[1]中国空气动力研究与发展中心计算空气动力研究所,四川绵阳621000 [2]北京航空航天大学国家计算流体力学实验室,北京100083

出　　处：《空气动力学学报》2013年第4期487-493,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金资助项目(91016001);国家重点基础研究发展计划(2009CB724100)

摘　　要：为开展RANS/LES混合模拟,在传统三阶迎风偏置格式的基础上,提出一类混合型的三阶计算格式,格式在中高波数范围具有可调的耗散水平。在此基础上,文中通过计算比较研究两种RANS/LES混合算法:一种是基于Spalart-Allmaras一方程模型的DES模型(DES-SA),另一种是基于混合长度模型的DES模型(DES-ML),使用发展的三阶格式对圆柱绕流进行模拟,并将得到的结果与文献比较,对计算格式、DES-ML算法进行了初步探讨。In order to make numerical simulations using Detached-Eddy Simulation（DES）hybrid method,a third-order hybrid scheme has been proposed on the basis of the traditional third-order upwind-biased scheme.The dissipation of the new hybrid scheme can be adjusted in moderate and higher band of the scaled wave number.Based on the aforementioned works,comparative numerical studies have been made on two RANS/LES hybrid methods,i.e.,DES-SA based on the S-A turbulent model and DES-ML based on the mixing length model.The computations choose the low-speed flow around three-dimensional cylinder as an example,while using several difference schemes including the developed third-order scheme.Comparisons have been made between the obtained results and that from references,and discussions have been made about the new hybrid scheme and DES-ML method also.

关 键 词：RANS LES混合算法 修正波数 混合格式 

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]