Setting Up a Wall Condition

Walls assigned to surfaces of a fluid are typically used to mimic the presence of a solid body and prevent flow through those surfaces. Walls can also be used to define thermal conditions at the extremity of the fluid flow.
  1. Click the Fluid Flow dropdown menu in the ribbon of the Simulation tab and choose Wall.
  2. Select one or more faces to apply a wall condition. Use Ctrl + click to select multiple faces.
    If your model contains named selections, click Advanced filters and use Link named selections to choose one from the list.
  3. From the dropdown menu on the left side of the HUD, specify the motion of the fluid in contact with the wall.
    By default, the wall is defined to be no slip, that is the fluid sticks to the wall. The no slip wall can be stationary or moving. If the wall is moving, the fluid moves with the same velocity as the wall. Moving walls can be rotational or translational and the direction of motion must be tangential to the face. No slip, insulated walls will automatically be assumed on any external surface of bodies that represent liquid or gas and do not have flow conditions applied.
    Choose Free slip when viscosity or velocity of the fluid flow means that the friction at the interface with a solid wall has a negligible impact and can be ignored.
  4. Optionally, on the right side of the HUD, click to include thermal conditions and specify how heat is transferred at the wall. Additionally, click to include internal radiation and specify the internal emissivity.