Convection Boundary Condition—Generative Design
A convection boundary condition simulates convection heating or cooling at selected reference surfaces in contact with a fluid. You can apply a global and local convection. The global convection is available by default in the thermal load set. You can edit or suppress the default global convection, however, you cannot delete it. The global convection gets applied on the exterior surfaces of all bodies, unless any other load or boundary condition is applied. You can further add a local convection on specific surfaces based on your requirement.
To Define a Local Convection Boundary Condition
1. After you create a new thermal simulation study, click > 
Convection. The Convection dialog box opens.
Convection. The Convection dialog box opens.2. Specify a Name for the boundary condition or accept the default name. Optionally click the color swatch adjacent to the Name box to change the color of the icon, the distribution, and the text displayed for the boundary condition.
3. Select a surface to which you want to apply the boundary condition. Your selection appears in the References collector.
4. Type a non-negative real value, or a parameter or mathematical expression that evaluates to a non-negative real number for the Convection Coefficient.
5. For Ambient Temperature, specify the temperature of the surrounding fluid. Select units for ambient temperature from the list, or accept the default units.
6. Click OK to create the boundary condition and save it.