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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

pages 605-616
DOI: 10.1615/THMT-18.630
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ABSTRAKT

A hybrid RANS/LES model is presented, in which RANS and LES contributions to the subgridscale (SGS) Reynolds stresses are computed on two distinct grids and are seamlessly blended. The instantaneous, fluctuating SGS Reynolds stress field is supported by a statistical RANS eddy viscosity model in regions where the LES grid is considered as coarse. The present hybrid model acts as a near-wall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on grids with very low wall-normal resolution, while the RANS model is solved on wall-refined high-aspect ratio grids. Predictions of a heated plane channel flow for a range of Reynolds numbers are generally improved in comparison to conventional LES, with the wall-nearest grid point lying far in the logarithmic layer. Current work also includes a validation on a ribbed channel flow with high blockage ratio, where results are very promising.

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