FSI - Deformation and constraints difficulties
 

Hey,

First, I'd like to say that I don't have a deep knowledge about Ansys, as I've just started using it due the necessity of making this 2-way FSI analysis.

I am trying to simulate a pre-compression rubber valve. The ideia is that the valve will deform with the increasing pressure of the flow, allowing the fluid to pass through.

So far, i've been struggling to make the valve deform the way it is supposed to.
In the real model, the valve is inside a tube, but I am trying to avoid using another body because I know that the contact between the parts will make the simulation much more complicated and longer. So i've been trying to use constraints instead.

The problem is that the valve is not squeezing as expected, it is moving to the sides.

Here are some imgs of the model, the constraints and what i am getting as results:

http://i.imgur.com/WF40YFo.jpg

http://i.imgur.com/ZC0Rwnx.jpg

http://i.imgur.com/s0MT9bn.png


Is it possible use a constraint to limit unidirectional movement only? I think if I could restrain one of the edges from the base from moving to +Z and the other to -Z it would do the trick (I need the base to squeeze though)