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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

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
Section of Aerothermodynamics ESTEC-ESA, P.O. Box 299, 2200 AG Noordwijk, 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.