Natural Convection: Exercise 4—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 Flow and click 
3. Under Available Modules, select Heat 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 select the following values for the options listed:
◦ Converge Criterion—0.000001
◦ Under Numerics, for Numeric Scheme set the following values:
▪ Velocity—2nd Order Upwind
▪ Density—2nd Order Upwind
◦ Gravity Force—Yes
▪ g—0, -9.81, 0 m/s2
Specifying Heat Module Conditions
1. In the Flow Analysis Tree, under Physics select Heat.
2. In the Model tab select the following values for the options listed:
◦ Converge Criterion—0.000001
◦ Under Numerics, set Numeric Scheme to 2nd Order Upwind