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LES OF TRANSITIONAL FLOWS USING APPROXIMATE DECONVOLUTION

Phillipp Schlatter
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Steffen Stolz
Institut fur Fluiddynamik ETH Zurich, ETH Zentrum, CH-8092 Zurich, Switzerland

Leonhard Kleiser
Institute of Fluid Dynamics ETH Zurich ETH Zentrum, CH-8092 Zurich, Switzerland

Resumo

Large-eddy simulations of transitional incompressible channel flow on comparably coarse grids are performed. Two modifications to the standard Approximate Deconvolution Method (ADM) are proposed and compared to highly resolved DNS calculations. The results demonstrate that it is well possible to simulate transitional flows on the basis of the ADM algorithm. During the initial phase of transition, the models remain inactive and do not disturb the flow development as long as it is still well resolved on the coarse LES grid. During the late stages of transition the model contributions provide necessary additional dissipation.
The results of the modified ADM show excellent agreement with DNS in e.g. the skin friction throughout the transitional phase and the fully developed turbulent channel flow. Moreover, due to the dynamic determination of the model coefficient, no additional ad-hoc constants or adjustments are needed.