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LES OF SPATIAL TRANSITION IN PLANE CHANNEL FLOW

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

Abstrakt

Spatial large-eddy simulations (LES) of forced transition in plane channel flow are presented and compared to temporal simulations. Using the fringe method, spectral Fourier discretisation can be employed also in the streamwise, spatially evolving flow direction. Various subgrid-scale (SGS) models have been examined, including the dynamic Smagorinsky model, high-pass filtered (HPF) eddy-viscosity models and the relaxation term model (ADM-RT). The applicability of the fringe method in conjunction with a SGS model is discussed. It is shown that all SGS models cause a significant improvement of the results over a coarse-grid no-model calculation. The most accurate prediction of transitional flow structures is obtained using the ADM-RT model. The results also show that the SGS models behave similarly in temporal and spatial simulations.