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Now, we need to select the faces of the chips that will generate heat. For the model; for sake of simplicity, we will assume that only one side of the electronic boards generate heat is generated on one side of each electronic board. . 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.

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