Turbulent Flow in Diffuser: Exercise 4—Assigning Boundary Conditions
Specifying Inlet Boundary Conditions
1. Under Boundary Conditions, General Boundaries select inlet.
2. In the Model tab select the following values for the options listed:
◦ Flow—Specified Velocity
◦ Velocity—18.06,0,0 m/s
Specifying Outlet Boundary Conditions
1. Under Boundary Conditions select outlet.
2. In the Model tab select the following values for the options listed:
◦ Flow—Specified Pressure Outlet
◦ Pressure—0 Pa
Specifying Volume Conditions
1. Under Domains, select Diffuser.
2. To set the fluid, click 
Materials. The Material Selection dialog box opens. The fluid properties are set automatically when you select a new fluid.
Materials. The Material Selection dialog box opens. The fluid properties are set automatically when you select a new fluid.3. For fluid domain Diffuser select air.
4. Click OK.
5. In the Properties panel, Model tab, set the following:
◦ For Common, under Density set the value to 1.15758 kg/m3
◦ For Flow, set Viscosity to 1.8406e-05 Pa-s