[jseamon1]

Hello All,

I have a 2-way-coupled fsi simulation where I am trying to simulate flow through a very flexible channel (channel modulus 3600 pa) and apply a transverse vibrational displacement to the channel of about 100 hz (see pictures for explanation). The ends of this flexible channel are connected to much stiffer channels as well to simulate better what is happening in our experimental setup.

I have the simulation setup and have tried running it, but the problem is that when I introduce the transverse vibration to the tube, I get a reverse flow warning from the fluid solver which cause the elements in the solid domain to warp in a very odd way (the channel essentially collapses on itself).

I am hoping I can get some help from someone who would be able to look over my setup and perhaps help me identify what I need to adjust to get convergence. Thank you for your help!