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For this problem, we are going to import the geometry into ANSYS, which was designed using CAD software.
Click here to download the geometry file.
from a CAD package. Download the assembly here. Save the file somewhere convenient, like your desktop or your working directory.
To open Use the import button in the Workbench to open up the file. (Remember to select "Geometry File" from the drop down menu, so you can see .STEP files.) 
Once we are satisfied with our geometry, we can close the design modeler. Now, we should be looking at the Project window. To connect the geometry to the project, click and drag . As soon as you drag the box, ANSYS will highlight the geometry and model boxes in the main project.
Drag and drop the geometry box onto 
file in ANSYS, right click the Geometry tab in the Workbench. Select Import Geometry > Browse. Browse to the geometry location on your computer. If you do not see the file, make sure you are browsing for geometry files (the pull down menu at the bottom right of the browsing window for computers running Windows 7). Select the Geometry and click Open. This will import your geometry into ANSYS. Your project window should now look like the image below.
