If you plan to perform 2D analysis on your model, you must first define your model as a 2D model type using the
Model Setup dialog box. You activate this dialog box by selecting
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Model Setup if you want to convert a 3D model to a 2D model during your simulation session. When you define your model as a 2D model, you use the
Model Type dialog box to select the geometry on which you want to perform the 2D analysis and a reference coordinate system. As you prepare your 2D model, be aware that the geometry you select for analysis must be coplanar, and the reference coordinate system must be Cartesian.