adding stress/pressure (psi)

Submitted by rasoul on Sat, 09/28/2013 - 12:30

I need to know is there any command or tactic/solution for adding stress (psi) to the one surface/edge of a simulation domain (box) which is poured by particles?
I have attached a picture that can help you to understand me.

Thank you for your help in advance,

Sincerely,
Rasoul

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rasoul | Tue, 10/08/2013 - 21:35

For using "fix mesh/surface/stress/servo" I have to implement mesh (file filename.stl).
How can I do that?
I do not input mesh in my simulation.