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*TURBULENCE MODEL
Specify turbulence models for fluid analyses.

This option can be used only as a suboption of the *CFD option to enable turbulence modeling for fluid flow simulations.

Products: Abaqus/CFD  Abaqus/CAE  

Type: History data

Level: Step

Abaqus/CAE: Step module

References:

Required parameter:

TYPE

Set TYPE=SPALART ALLMARAS to specify the Spalart-Allmaras turbulence model.

Set TYPE=RNG KEPSILON to specify the - renormalization group turbulence model.

Set TYPE=KEPSILON REALIZABLE to specify the - realizable turbulence model.

Set TYPE=KOMEGA SST to specify the - shear-stress transport turbulence model.

Data lines for TYPE=SPALART ALLMARAS: 

First line:

  1. , production coefficient (default=0.1355).

  2. , cross diffusion coefficient (default=0.622).

  3. , production damping (default=7.1).

  4. , Spalart correction for production damping (default=5).

  5. , for near-wall equilibrium conditions (default=3.2391).

  6. , for near-wall friction coefficient calibration (default=0.3).

  7. , near-wall damping coefficient (default=2).

  8. , diffusion coefficient for the diffusive transport of the turbulent kinematic viscosity . The default value for is 0.6667.

Second line:

  1. , Karman constant (default=0.41).

Third line (enter a blank line unless ENERGY EQUATION=TEMPERATURE is used in the associated *CFD option):

  1. , turbulent Prandtl number (default=0.8889).

Data lines for TYPE=RNG KEPSILON: 

First line:

  1. , turbulent viscosity coefficient (default=0.085).

  2. , production coefficient for the equation (default=1.42).

  3. , unadjusted dissipation coefficient for the equation (default=1.68).

  4. , diffusion coefficient for the turbulent kinetic energy diffusive transport (default=0.72).

  5. , diffusion coefficient for the energy dissipation rate diffusive transport (default=0.72).

  6. , second coefficient for the dissipation coefficient in the equation (default=0.012).

  7. , fixed point ratio of the turbulent to mean strain time scale (default=4.38).

Second line (enter a blank line unless ENERGY EQUATION=TEMPERATURE is used in the associated *CFD option):

  1. , turbulent Prandtl number (default=0.8889).

Data lines for TYPE=KEPSILON REALIZABLE: 

First line:

  1. , turbulent viscosity coefficient (default=0.09).

  2. , realizable viscosity coefficient (default=4.0).

  3. , minimum value for the production coefficient for the equation (default=0.43).

  4. , dissipation coefficient for the equation (default=1.9).

  5. , diffusion coefficient for the turbulent kinetic energy equation (default=1.0).

  6. , diffusion coefficient for the energy dissipation rate equation (default=1.2).

Second line:

  1. , Karman constant (default=0.41).

  2. , law of the wall constant (default=8.43171).

  3. , two-layer blending threshold (default=60.0).

  4. , two-layer thickness parameter (default=6.0).

  5. , two-layer turbulent viscosity coefficient (default=70.0).

  6. , two-layer prescribed coefficient (default=2.0).

  7. , standard dissipation coefficient for the equation (default=1.9).

Third line (enter a blank line unless ENERGY EQUATION=TEMPERATURE is used in the associated *CFD option):

  1. , turbulent Prandtl number (default=0.8889).

  2. , standard production coefficient for the equation (default=1.44).

Data lines for TYPE=KOMEGA SST: 

First line:

  1. shear stress transport model coefficient (default=0.31).

  2. dissipation coefficient of the equation (default=0.09).

  3. Karman constant (default=0.41).

  4. turbulent Prandtl number for the equation used in the near wall region (default=0.85).

  5. turbulent Prandtl number for the equation used in the outer wall region (default=1.0).

  6. turbulent Prandtl number for the equation used in the near wall region (default=0.5).

  7. turbulent Prandtl number for the equation used in the outer wall region (default=0.856).

  8. dissipation coefficient for the equation used in the near wall region (default=0.075).

  9. dissipation coefficient for the equation used in the outer wall region (default=0.0828).

  10. production coefficient for the equation used in the near wall region (default=0.5532).

  11. production coefficient for the equation used in the outer wall region (default=0.4404).

Second line (enter a blank line unless ENERGY EQUATION=TEMPERATURE is used on the associated *CFD option):

  1. turbulent Prandtl number (default=0.8889).