FLUENT 6 - Solution to highly swirling flow problem - problem of over-predicting tangential velocity near the wall.
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.
Green-Gauss cell-based solver
Pressure-based Coupled Solver
Relative velocity formulation
Turbulence Model = RSM
Wall reflection option OFF to avoid impact on swirl
Near-wall Treatment = Non-equilibrium wall function
Pressure = PRESTO
Momentum = MUSCL
Turbulence = Second-order upwind
Courant number = 100
Pressure, Momentum = 0.5
Turbulence = 0.1 (can be increased)