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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN Print:
1-56700-135-1

A NONLINEAR LOW REYNOLDS TURBULENCE CLOSURE BASED ON k − ε AND k − ω

Saskia Pattijn
Spicer Off-Highway Products, Ten Briele 3, 8200 Brugge, Belgium

Johan Steelant
ESTEC – European Space Research and Technology Centre Keplerlaan 1, 2200 AG Noordwijk ZH, The Netherlands

Erik Dick
Dept. of Flow, Heat and Combustion Mechanics, University of Gent, St. Pietersnieuwstraat 41, 9000 Gent, Belgium

Abstract

A quadratic low Reynolds turbulence closure ensuring non-zero anisotropics on the wall is described.
The influence of anisotropy and of the length-scale determining parameter is assessed by combination of the nonlinear constitutive relation with both a k-ε and a k-ω based (SST) turbulence model.
The performance of these models is compared to a classical linear low Reynolds k-ε model and a non-linear high-Reynolds k-ω model for two testcases: channel flow and Backward facing step (BFS) flow.