Title: Wall y+ approach for dealing with turbulent flows over a wall mounted cube

Authors: S.M. Salim, M. Ariff, S.C. Cheah

Addresses: Faculty of Engineering, Division of Environment, University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia. ' Faculty of Engineering, Division of Environment, University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia. ' Faculty of Engineering, Division of Environment, University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia

Abstract: An approach to dealing with turbulent flows over a wall mounted cube using the wall y+ (non-dimensional distance from the wall) as guidance in selecting the appropriate grid configuration and corresponding turbulence models is investigated using FLUENT 6.3. The study is divided into two sections – Case I and Case II, dealing with low and high Reynolds numbers, respectively. Five turbulence models – the standard k-ε, standard k-ω, Reynolds Stress Model (RSM), Spalart-Allmaras (SA) and renormalisation group (RNG) k-ε are used to solve the closure problem. Their behaviours, together with the accompanying near-wall treatments, are investigated for wall y+ covering the viscous sub-layer, the buffer layer and the log-law region.

Keywords: wall y+; wall mounted cube; turbulent flow; near-wall treatment; grid generation; CFD; computational fluid dynamics; viscous sub-layer; buffer layer; log-law region.

DOI: 10.1504/PCFD.2010.035368

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.5/6, pp.341 - 351

Published online: 26 Sep 2010 *

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