Calculation of Separated Flows with a Two-Layer Turbulence Model

Part of the Notes on Numerical Fluid Mechanics (NNFM) book series (NONUFM, volume 40)


A two-layer turbulence model is described which uses the standard k-ε model in the bulk of the flow and resolves the viscosity-affected regions near walls with a one-equation model based on empirical length-scale prescriptions. Applications of the two-layer model to the following separated flows are presented: flow over a backward-facing step, over a T-profile, over a channel bed with periodic dunes and past an airfoil at 14° angle of attack. In all cases with larger separation regions, the two-layer model yielded a significant improvement of the predictions compared with the standard k-ε model using wall functions; in particular the length of the separation region is predicted in better agreement with the experiments.


Shear Layer Separate Flow Wall Function Separation Region Reattachment Point 
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© Springer Fachmedien Wiesbaden 1993

Authors and Affiliations

  1. 1.Institute for HydroemchanicsUniversity of KarlsruheKarlsruheF.R. Germany

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