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Title: A turbulence model for recirculating flow
Authors: United States. Bureau of Reclamation.
United States. Dept. of the Army.
Bernard, Robert S.
Keywords: Incompressible flow
Recirculating flow
Numerical models
Numerical modeling
Turbulence models
Turbulence modeling
Reynolds number
Fluid dynamics
Issue Date: Sep-1991
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-91-14.
Description: Technical Report
Abstract: A simple adjustment is proposed that improves the predictions of the standard k-ϵ turbulence model in the presence of two-dimensional recirculating flow. An eddy Reynolds number calculated from velocity, vorticity, and eddy viscosity is introduced as a scaling parameter for reducing the decay term in the governing equation for the turbulence-energy dissipation rate. Using the adjusted k-ϵ model to compute the flow past a backstep (channel expansion), the STEMR finite-difference code gives better predictions for streamlines, velocities, and turbulence energies than it does with the standard k-ϵ model. Computed reattachment lengths compare well with experimental data for channel expansion ratios between 1 and 2.
Appears in Collections:Technical Report

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