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Large eddy simulation of the flow around\\ a three-dimensional axisymmetric hill

Sinisa Krajnovic (Institutionen för tillämpad mekanik, Strömningslära)
Flow, Turbulence and Combustion (1386-6184, 1573-1987). (2007)
[Artikel, refereegranskad vetenskaplig]

This paper investigates the use of LES for a flow around a three-dimensional axisymmetric hill. Two aspects of this simulation in particular are discussed here, the resolution and the inlet boundary conditions. In contrast to the LES of flows with sharp edge separations which do not require the near-wall dynamics to be fully resolved, the hill flow LES relies on the resolution of the upstream boundary layer in order to provoke the separation at a correct position. Although around 15 000 000 computational cells were used, the resolution of streaky structures in the near-wall region that are important for a LES is not achieved. Two different inlet boundary conditions were used: the steady experimental profile and the time-dependent boundary conditions produced from DNS results of low Reynolds number channel flow. No significant improvement in the results was obtained with the unsteady inlet condition. This indicates that, although the unsteady inlet boundary conditions may be necessary for a successful LES of this flow, they must be followed with the resolution of the boundary layer for a successful LES.

Nyckelord: LES, large eddy simulation, three-dimensional axisymmetric hill



Denna post skapades 2007-10-08. Senast ändrad 2014-09-29.
CPL Pubid: 51835

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur