How can I use rough walls with the SST turbulence model?
|
You'll have to edit the CCL to use this beta feature. The CCL for a wall boundary condition in CFX-10 should look like the following: BOUNDARY : MyWall Boundary Type = WALL Location = DefaultWalls BOUNDARY CONDITIONS : WALL INFLUENCE ON FLOW : Option = No Slip TURBULENT WALL FUNCTIONS : Option = Scalable Minimum Yplus = 2.5 END END WALL ROUGHNESS: Option = Rough Wall Roughness Height = 0.0005 [m] END END END You must include the Minimum Yplus parameter and you must use a value of 2.5, as shown. You will also need to set the following expert parameter: FLOW: EXPERT PARAMETERS: effective viscosity type = 2 END END To ensure a consistent near wall treatment, you should not include any smooth walls in your simulation. If you have walls that you want to model as smooth, then use the Rough Wall option and set a small roughness height. |
||
|