FLUENT 6 - Solution to highly swirling flow problem - problem of over-predicting tangential velocity near the wall.
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In high-swirl rotating turbulent flows, the default settings for the Reynolds Stress Model and wall function can lead to erroneous predictions of the velocity profiles near rotating walls such that there is unphysical dissipation of the swirl in the outer region. The tangential velocity is flatter and decays more slowly resulting in an over-prediction of tangential velocity near the wall.
Steady-state solver Green-Gauss cell-based solver Pressure-based Coupled Solver Relative velocity formulation Turbulence Model = RSM Options Linear strain Wall reflection option OFF to avoid impact on swirl Near-wall Treatment = Non-equilibrium wall function Discretization Pressure = PRESTO Momentum = MUSCL Turbulence = Second-order upwind Solver Controls Courant number = 100 Under-relaxation Factors Pressure, Momentum = 0.5 Turbulence = 0.1 (can be increased) |
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