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

DOI: 10.1615/THMT-18.630
pages 605-616

P. Nguyen
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, M13 9PL Manchester, United Kingdom

Juan Uribe
School of MACE, The University of Manchester, UK; EDF Energy R&D UK Centre, Low Carbon Generation, M13 9PL Manchester, United Kingdom

I. Afgan
Modelling & Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, M13 9PL Manchester, UK; Institute of Avionics & Aeronautics, Air University, E-9, Islamabad, Pakistan

Dominique R. Laurence
Modelling and Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK; EDF R&D, Fluid mechanics, Energy and Environment, 78401 Chatou, France


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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