To define an outflow condition on a boundary section, follow these steps:
Select the Outflow menu item in the list of boundary condition choices.
Outflow
(For a generalized Newtonian flow, no further inputs are required.)
For a viscoelastic flow, enter the value of flow rate, when prompted.
Select the type of flow rate: volumetric flow rate or mass flow rate.
The default type is Volumetric flow rate.
Volumetric flow rate
Note: If you select Mass flow rate, you must define a positive and constant density.