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As you can probably tell, ANSYS does not generate the model automatically, so we need to generate the geometry. Click to generate the geometry.
Create a Flow Geometry
The next step is for us to create a flow geometry. The air is going to flow through the inside of the box; however, we need to create a geometry for this empty space in order for ANSYS to be able to calculate the solution. We will accomplish this by creating Caps, then using those caps to create Fill. In the menu bar, select Tools > Fill. In the Details window, name the fill Caps