One way to allow free motion in one direction and prevent motion in the opposite direction is to add nonlinear contact. Frictional or frictionless contact requires that you add an extra body.
For a solid block that will experience only small motions, you can avoid manually adding the extra body by using a Compression Only Support scoped to one face of the block. Ansys will automatically create an extra body (under-the-hood) by copying the face and creating frictionless support to provide that functionality. However for large motions, nodes in the block will fall off the surface that was created so it is generally better to manually create a surface larger than the face to accomodate large motions.
When you define Frictional contact, you can add a coefficient of friction.
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