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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.
|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.|
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|