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hi to all guys,
I'm trying to run a pair two-way fluid structure. I'm using Transient Mechanical and ANSYS CFX. Unfortunately, after countless attempts I can not get any results.
My problem consists in a 2D geometry, formed by a pair of floors channels (fluid domain), separated by two membranes (solid domain), subjected to a periodic output pressure change.
Unfortunately, the best result was a partial deformation of 16% (should support the 99% up to a change of topology of the system) of the channel thickness, but already it is possible to see a considerable generation of negative volumes, due to the intersecting of the domains . We report a figure to make the idea. If you try to stretch the size of the channel along the bike, or intensify the maximum pressure value the problem crashes.
I tried to change the mesh, the time step, and make the less critical phenomenon possible.
Where could I go wrong?

In the output of the channels I impose a pressure change, which creates a gradient between the two channels. In impogno input a flow condition imposed. The membranes are bound to interlocking ends, for the rest I have a symmetry condition that should simplify things.

Thank you all in advance for your attention

[billoable]

there are other figure

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friends, there is no solution?