Fluid structure interaction module discussion 2

Hi, Dear all,

I guess my previous request too complicated.
So i start from a single one to demonstrate fluid structure interaction module, just two single rectangular.

surprisingly it still cannot solve and take long time to run.

Hope someone can give me some guide or instruction to try.

Inlet is set to 20mmHg with step function to smooth the curve.

Outlet set to 0

ideally, it match the condition. but why is it still hard to be converge?