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.


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    Title :

    A Turbulence Model for Recirculating Flow



    Published in:

    Publication date :

    1991


    Size :

    1642190


    Type of media :

    Report


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :


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