How can I deal with the velocity option in boundary condition ?

Try running a dynamic explicit step instead of a static step and apply the velocity like a regular displacement BC. Use the total time of the step to control how much you want your BC to displace as Anshul pointed in the example.

Try running a dynamic explicit step instead of a static step and apply the velocity like a regular displacement BC. Use the total time of the step to control how much you want your BC to displace as Anshul pointed in the example.