Posted by: william
« on: February 04, 2012, 07:05:01 PM »Hi,
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)
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)