CMS-Flow Eddy Viscosity
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Overview
Eddy Viscosity in CMS-Flow is not a user definable parameter. A description of the advanced cards related to eddy viscosity is shown in the table below.
| Card | Arguments | Default | Typical Range | Description | Versions |
|---|---|---|---|---|---|
| USE_MIXING_TERMS | CHARACTER | ON | ON |OFF || Turns ''On'' and ''Off'' the mixing terms in the momentum and transport equations. Essentially sets the eddy viscosity and mixing coefficients to zero.|| >=3.5 |- |TURBULENCE_MODEL || CHARACTER|| SUBGRID || SUBGRID <nowiki>|FALCONER| PARABOLIC | MIXING-LENGTH | Specifies the turbulence model used | >=3.5 |
| EDDY_VISCOSITY_CONSTANT | REAL | 1.0E-6 | >=0.0 | Constant contribution or base value of eddy viscosity | >=3.5 |
| EDDY_VISCOSITY_BOTTOM | REAL | 0.0667 | 0.02-0.1 | Coefficient related to the contribution to eddy viscosity from the bottom shear | >=3.5 |
| EDDY_VISCOSITY_HORIZONTAL | REAL | 0.4 | 0.1-0.2 | Coefficient related to the contribution to eddy viscosity from horizontal velocity gradients | >=3.5 |
| EDDY_VISCOSITY_WAVE | REAL | 0.5 | 0.2-1.0 | Coefficient related to the wave bottom friction contribution to eddy viscosity | >=4.0 |
| EDDY_VISCOSITY_BREAKING | REAL | 0.05 | 0.05-0.1 | Coefficient related to the wave breaking contribution to eddy viscosity | >=4.0 |
More information can be found here.