Setting Boundary Conditions and Values

Specify a constant velocity in the X direction at the inlet, and a constant pressure at the outlet. Set the centerline boundary to be of type axis. This axis boundary must lie exactly on the Y = 0 line; project the axis to the appropriate plane.

  1. Select the Regions > Fluid > Boundaries > Axis node and set Type to Axis.
  2. Right-click the Boundaries > Axis node and select Project to Axis from the pop-up menu.


  3. In the Repair Axis Boundary dialog, click OK.


    The vertices move along the axis to Y = 0.
Specify conditions for the inlet and outlet boundaries:
  1. Set the boundary types for the inlet and outlet:
    Boundary Type
    Inlet Velocity Inlet
    Outlet Pressure Outlet
  2. Edit the Boundaries > Inlet node and set the following properties:
    Node Property Setting
    Physics Conditions
    Turbulence Specification Method Intensity + Length Scale
    Velocity Specification Method Components
    Physics Values
    Turbulence Intensity Value 0.034
    Turbulent Length Scale Value 0.0107 m
    Velocity Value [1.5, 0.0] m/s
  3. Edit the Boundaries > Oultet node and set the following properties:
    Node Property Setting
    Physics Conditions
    Turbulence Specification Method Intensity + Length Scale
    Physics Values
    Turbulence Intensity Value 0.034
    Turbulent Length Scale Value 0.0107 m
  4. Save the simulation.