I have a valve of elastic material and testing the closing behavior by applying a force like this:
I have set up a contact on the two faces where the leaflets are expected to touch:
This contact has a large pinball radius, but I testet many sizes as well as automatic. I also tested manual Penetration Tolerance and different Update Stiffness frequencies, but the penetration problem persists.
In my mesh, I made sure to have more than 1 element through the thickness, while keeping it coarse for quicker testing:
Simulating until 50 ms with time step 10 ms, I notice that the leaflets are overlapping/penetrating:
It looks like there is no response to collision happening at all, which could mean either the collision is not detected or it is not deemed necessary to resolve it. Not sure what exactly is happening here.
I already tried finer mesh and smaller time steps, but it did not seem to help, at least to the extent of my testing, which was bound by time.
After all this trial and error I am interested in real understanding. What could be an approach to fix this?