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Near‐wall turbulence modelling with enhanced dissipation
Author(s) -
Rahman M. M.,
Siikonen T.
Publication year - 2003
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.569
Subject(s) - turbulence , dissipation , mechanics , reynolds number , direct numerical simulation , turbulence kinetic energy , flow (mathematics) , statistical physics , diffusion , scale (ratio) , kinetic energy , k omega turbulence model , physics , k epsilon turbulence model , pressure gradient , adverse pressure gradient , flow separation , thermodynamics , classical mechanics , quantum mechanics
A low‐Reynolds number k – ε turbulence model is proposed that incorporates diffusion terms and modified C ε(1,2) coefficients to amplify the level of dissipation in non‐equilibrium flow regions, thus reducing the kinetic energy and length scale magnitudes to improve prediction of adverse pressure gradient flows, involving flow separation and reattachment. Unlike the conventional k – ε model, it requires no wall function/distance parameter that bridges the near‐wall integration. The model is validated against a few flow cases, yielding predictions in good agreement with the direct numerical simulation (DNS) and experimental data. Copyright © 2003 John Wiley & Sons, Ltd.