Hello, I am trying to model the FSI problem of an elastic pipe, which is subjected to a pressure pulse at one end (in the fluid). The classic Moens-Korteweg problem.
The problem is based on the preCICE tutorial case elastic-tube-3d (but does use shell elements).
This is following Bazilevs2006 and Greenshield2005.
Pipe is 20 mm diameter, 2 mm wall thickness and 100mm long. The solid model is made from second order, triangular shell elements.
*BOUNDARY Ninlet,3,0 Noutlet,3,0
3 is the z-direction, i.e. axial direction.
I would expect this to fix all nodes on the ends of the tube to be fixed in that direction and allow expansion in radial (x and y) direction.
It does do that somewhat, but there is still considerable displacement in z.
Am I using the wrong BCs here?