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Next to Structural Conditions press Add > Support then select one of the cut sides as the location and the Type will be User Specified. Edit the Translation drop down menus until there is only one arrow going into our model and constrain the direction normal to the surface. A symmetric boundary condition implies that there is zero translation normal to the symmetry surface, and there is zero rotation about the two axes orthogonal to the symmetry surface. By constraining the normal direction to the symmetry surface this prevents both translation normal to the surface and rotation about the two orthogonal axes. In our problem we will setup three symmetry surfaces by constraining the normal directions for three surfaces as shown in the image below.
