A NONLINEAR LOW REYNOLDS TURBULENCE CLOSURE BASED ON k − ε AND k − ω
Spicer Off-Highway Products, Ten Briele 3, 8200 Brugge, Belgium
The European Space Research and Technology Center, Noordwijk, Netherlands
Dept. of Flow, Heat and Combustion Mechanics, University of Gent, St. Pietersnieuwstraat 41, 9000 Gent, Belgium
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.