LES of transitional boundary layers and wakes with trailing edge blowing
Two different solution schemes are applied for the LES of compressible turbulent flows. First, a conservative LES formulation is applied with the filtered structure-function model. Solutions for a compressible channel flow at M0 = 1 are in overall agreement with DNS references. The quasi-incompressible transitional boundary layers show the establishment of a streak system well upstream of the peak of skin friction. For harmonic and subharmonic perturbations, however, a different first location of high speed regions is observed. The second method is a mixed central-upwind scheme. The results for the case of a fully turbulent boundary layer are in good agreement with reference data from other authors. The simulation of the wake with trailing edge blowing shows that the jet inhibits the generation of the regular vortex shedding. Instead only smaller and weaker spanwise vortices are generated, rapidly decaying through the interaction with streamwise vortices. Thus, the mixing in the wake with the external flow is reduced and the losses become smaller compared to the case without blowing.
KeywordsTurbulent Boundary Layer Coarse Grid Fine Grid Spanwise Direction Streamwise Vortex
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