A simple adjustment is proposed that improves the predictions of the standard k-? 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-? 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-? model. Computed reattachment lengths compare well with experimental data for channel expansion ratios between 1 and 2.
A Turbulence Model for Recirculating Flow
Technical Report ; HL-91-14
1991
1642190
Report
Electronic Resource
English
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