Select the Physics task in the Workflow.
Boundary Conditions / Forces
First, the inlet must be defined using the Fluid Flow Conditions. In the Add drop down menu by Fluid Flow Conditions, select Inlet. Then, using the face selection tool, define an inlet at the wide end of the duct. Input the Velocity magnitude as 33 [ft s^-1] and a Temperature of 73 degrees [F]. When entering the Velocity magnitude, be sure to enter the units correctly. After entering the value in “ft s^-1”, it will be automatically converted to the default units of “in s^-1” and displayed accordingly.
Once the inlet is defined, the outlet is next. In the same Add menu, define an Outlet at the small end of the duct. Assign a Gauge static pressure of 0 psi.
Next, a Wall condition must be added to all surfaces that are not already defined. Wall can be found in the same Add menu as the previous conditions. By default, the wall condition is thermally insulated. AIM will automatically create the Wall once the option is selected, automatically selecting every face that doesn't already have a constraint on it.