Constraints are applied to a model to prevent it from moving in response to applied loads.
Click (Simulation workspace > Setup tab > Constraints panel > Structural Constraints) to open the Structural Constraints dialog.
Select a constraint Type from the drop-down list in the Structural Constraints dialog.
Select faces, edges, or vertices where you want the constraint applied. The constraint is applied at a node that is created at the centroid of the selected entity.
Click OK to accept the changes and close the dialog.