A Partially-Averaged Navier-Stokes model for hill and curved duct flow

详细信息    查看全文

• 作者：Jia-mei MA ;   ; ^{jiameima@163.com} ; Fu-jun WANG  ; ;   ; ^{wangfj@cau.edu.cn} ; Xin YU ; Zhu-qing LIU[Author vitae]
• 关键词：Partially-Averaged Navier-Stokes (PANS) ; flow separation ; recirculation ; reattachment ; resolved turbulence
• 刊名：Journal of Hydrodynamics, Ser. B
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：23
• 期：4
• 页码：466-475
• 全文大小：889 K

文摘

Turbulent flows past hill and curved ducts exist in many engineering applications. Simulations of the turbulent flow are carried out based on a newly developed technique, the Partially-Averaged Navier-Stokes (PANS) model, including separation, recirculation, reattachment, turbulent vortex mechanism. The focus is on how to accurately predict typical separating, reattaching and secondary motion at a reasonable computational expense. The effect of the parameter, the unresolved-to-total ratio of kinetic energy (f_k), is examined with a given unresolved-to-total ratio of dissipation (f_?) for the hill flow with a much coarser grid system than required by the LES. An optimal value of f_k can be obtained to predict the separation and reattachment locations and for more accurate simulation of the resolved turbulence. In addition, the turbulent secondary motions are captured by a smaller f_k as compared with the RANS method with the same grid.