Progress in Hybrid RANS-LES Modelling

Abstract

To refer to or to cite this work, please use the citation to the published version: Kubacki S., Dick E. (2010). Hybrid RANS/LES of plane impinging jets with k-ω based models. Progress in hybrid RANS-LES AbstractPlane impinging jets with nozzle-plate distances H/B=10 at Re=13500 and H/B=9.2 at Re=20000 are simulated with k-ω  based hybrid RANS/LES models. Three ways of substitution of the turbulent length scale by the local grid size in the LES mode of the hybrid RANS/LES models are tested. The results show that the hybrid models give much better prediction of wall shear stress and heat transfer rate along the impingement plate than the RANS model. The good performance of the hybrid models is due to their ability to resolve the evolution and break-up of the vortices in the shear layer of the jet, which strongly affects the turbulent flow and convective heat transfer in the stagnation region and the developing wall-jet region.