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	Prediction of separation flows around a 6 : 1 prolate spheroid using RANS/LES hybrid approaches
	Xiao, Zhixiang ; Zhang, Yufei ; Huang, Jingbo ; Chen, Haixin ; Fu, Song
	2010-05-10 ; 2010-05-10
关键词	RANS/LES hybrid methods DES zonal-RANS/LES weakly nonlinear correction TURBULENCE MODELS SIMULATION Engineering, Mechanical Mechanics
中文摘要	This paper presents hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy-simulation (LES) methods for the separated flows at high angles of attack around a 6:1 prolate spheroid. The RANS/LES hybrid methods studied in this work include the detached eddy simulation (DES) based on Spalart-Allmaras (S-A), Menter's k-omega shear-stress-transport (SST) and k-omega with weakly nonlinear eddy viscosity formulation (Wilcox-Durbin+, WD+) models and the zonal-RANS/LES methods based on the SST and WD+ models. The switch from RANS near the wall to LES in the core flow region is smooth through the implementation of a flow-dependent blending function for the zonal hybrid method. All the hybrid methods are designed to have a RANS mode for the attached flows and have a LES behavior for the separated flows. The main objective of this paper is to apply the hybrid methods for the high Reynolds number separated flows around prolate spheroid at high-incidences. A fourth-order central scheme with fourth-order artificial viscosity is applied for spatial differencing. The fully implicit lower-upper symmetric-Gauss-Seidel with pseudo time sub-iteration is taken as the temporal differentiation. Comparisons with available measurements are carried out for pressure distribution, skin friction, and profiles of velocity, etc. Reasonable agreement with the experiments, accounting for the effect on grids and fundamental turbulence models, is obtained for the separation flows.
语种	英语 ; 英语
出版者	SPRINGER HEIDELBERG ; HEIDELBERG ; TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/22636]
专题	清华大学
推荐引用方式 GB/T 7714	Xiao, Zhixiang,Zhang, Yufei,Huang, Jingbo,et al. Prediction of separation flows around a 6 : 1 prolate spheroid using RANS/LES hybrid approaches[J],2010, 2010.
APA	Xiao, Zhixiang,Zhang, Yufei,Huang, Jingbo,Chen, Haixin,&Fu, Song.(2010).Prediction of separation flows around a 6 : 1 prolate spheroid using RANS/LES hybrid approaches..
MLA	Xiao, Zhixiang,et al."Prediction of separation flows around a 6 : 1 prolate spheroid using RANS/LES hybrid approaches".(2010).

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