How to introduce a negative pressure in a pipe in ABAQUS?

[Amir]

Hi
My friends

How Can I introduce a suction pressure in my axisymmetric pipe ( I mean without exerting the pressure in an adjacent surface since I want the pressure be an inherent property of the pipe itself and not to be exerted on something else and the pipe play the role of a mere rigid body cause the pressure boundary changes as the object is sucked in the pipe then I want the pressure be defined in the pipe itself rather than on the boundary of the objects) :) ?

Thanks a lot upon your opinions
Biofriend

[Jorgen]

I could be wrong, someone correct me if I am, but I don't think you can do what you are describing. Pressure is always a surface force. You can apply a negative pressure on the pipe, but what you really need, I think, is a pressure on the object.

-Jorgen