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PANS VS. LES FOR COMPUTATIONS OF THE FLOW AROUND A 3D BLUFF BODY

Branislav Basara (Institutionen för tillämpad mekanik, Strömningslära) ; Sinisa Krajnovic (Institutionen för tillämpad mekanik, Strömningslära) ; Sharath Girimaji
“7th International ERCOFTAC Symposium on “Engineering Turbulence Modelling and Measurements”, June 4-6, 2008, Limassol, Cyprus. (2008)
[Konferensbidrag, refereegranskat]

This paper presents comparisons between recently proposed Partially-Averaged Navier-Stokes (PANS) method with the Large Eddy Simulation (LES) for the flow around the Ahmed bluff body. PANS model changes seamlessly from Reynolds- Averaged Navier-Stokes (RANS) to the direct numerical solution of the Navier-Stokes equations (DNS) as the unresolved-to-total ratios of kinetic energy and dissipation are varied. The parameter which determines the unresolved-to-total kinetic energy ratio is defined based on the grid spacing and it is dynamically adjusted at each point at the end of every time step. The main target of this paper is to show if PANS obtains comparable results with LES calculations on finer meshes and improves results on coarser meshes. In other words, the question to be answered is whether PANS can provide the optimum solution for every computational mesh. This will be achieved by comparing PANS calculations on two different computational meshes: 3.4 mil.(grid A), and 8.0 mil. (grid B), with LES calculations on grid A and additional two grids consisting of 9.5 mil. cells (grid C) and 16.5 mil. cells (grid D).

Nyckelord: PANS, Partially-Averaged Navier Stokes, Ahmed body, vehicle aerodynamics



Denna post skapades 2008-12-15. Senast ändrad 2014-09-29.
CPL Pubid: 81559

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur