External Air Flow for a Truck: Exercise 3—Defining Physics Modules
1. In the Flow Analysis Tree, right-click Physics and select Select Physical Models. or click 
Physics Module. The Physical Model Selection dialog box opens.
Physics Module. The Physical Model Selection dialog box opens.2. Under Available Modules, select Turbulence and click 
3. Under Available Modules, select Streamline and click
4. Click Close to close the Physical Model Selection dialog box.
Specifying Flow Module Conditions
1. In the Flow Analysis Tree, under Physics select Flow.
2. In the Model tab, click Numerics.
3. Under Numeric Scheme, set the following values:
◦ Velocity—2nd Order Upwind
◦ Density—Upwind