Mesh

Open the Mesher and Suppress All Bodies

Open the Mesh by double clicking in the Project Schematic window. Give some time for the geometry to load. The first thing we will want to do is suppress all of the geometry bodies except the fill geometry we created in the last step. This will greatly simplify the solution and still give us the information pertinent to the problem statement. In the Outline window, expand Geometry, and select the last Solid in the list.

This solid should represent the fill geometry (the empty space) inside of the box. Check that the Solid is indeed the fill geometry.

Once you are sure you have the correct geometry, right click Solid and select Suppress All Other Bodies. This should leave only the fill geometry visible.

Create Named Selections

Inlet and Outlet

Now, we need to create the named selections that we will use to create boundary conditions. First, we will select the geometries that make up the inlet of the electronics box. Using the Face Selection Filter , select the two faces that correspond to the inlet of the box (Use CTRL to select more than one surface).

When the two surfaces have been selected, right click and select Create Named Selection. Name the selection, Inlet. Repeat the process for the two holes corresponding to the outlet, and name the selection, Outlet.

Heat Generation

Now, we need to select the faces of the chips that will generate heat; for sake of simplicity, we will assume that only one side of the electronic boards generate heat. However, because the electronic boards are behind other surfaces, it is a little bit more tedious to select the surfaces. Once again, hold down CTRL to select multiple surfaces. Next, click on the surface of a electronic board. Because the boards are behind surfaces, ANSYS will select the surface on top, as below.

In order to select the surface behind the top surface, we need to make use of the layer tool, in the bottom corner of the graphics window.