Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 31, Issue 5, Pages 862-878Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2010.04.011
Keywords
Plane impinging jet; Turbulence modelling; k-omega Model; Hybrid RANS/LES model
Categories
Funding
- Project 'Novel Multiscale Approach to Transport Phenomena in Electro-chemical Processes' (IWT) [MuTEch SBO 040092]
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Plane impinging jets with nozzle-plate distances H/B = 10, 9.2 and 4 and Re = 13,500, 20,000 are simulated with k-omega based hybrid RANS/LES models and with a RANS k-omega model. The results are compared to experimental and LES data. Three different 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 the wall shear stress and the heat transfer rate along the impingement plate than the pure k-omega 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. (c) 2010 Elsevier Inc. All rights reserved.
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