Premium
Calculation of complex near‐wall turbulent flows with a low‐Reynolds‐number k ‐ϵ model
Author(s) -
Koutmos P.,
Kostouros N. C.
Publication year - 1995
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.1650210203
Subject(s) - reynolds number , mechanics , turbulence , dissipation , direct numerical simulation , turbulence kinetic energy , pressure gradient , physics , adverse pressure gradient , range (aeronautics) , viscosity , classical mechanics , statistical physics , thermodynamics , materials science , composite material
An improved low‐Reynolds‐number k ‐ϵ model has been formulated and tested against a range of DNS (direct numerical simulation) and experimental data for channel and complex shear layer flows. The model utilizes a new form of damping function adopted to account for both wall proximity effects and viscosity influences and a more flexible damping argument based on the gradient of the turbulent kinetic energy on the wall. Additionally, the extra production of the inhomogeneous part of the viscous dissipation near a wall has been added to the dissipation equation with significantly improved results. The proposed model was successfully applied to the calculation of a range of wall shear layers in zero, adverse and favourable pressure gradients as well as backward‐facing‐step separated flows.