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.
Steady-state solver
Green-Gauss cell-based solver
Pressure-based Coupled Solver
Relative velocity formulation

Turbulence Model = RSM
Linear strain
Wall reflection option OFF to avoid impact on swirl
Near-wall Treatment = Non-equilibrium wall function

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)

Show Form
No comments yet. Be the first to add a comment!