Water-filled Hollow (Shell) Cylinder Model Help

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Hi everyone! I had a similar post a couple of months ago but I ended up never figuring it out. I am trying to model (2D axisymmetric) a hollow cylinder (a shell) that is filled with water. There is NO inlet or outlet i.e. the cylinder is capped.

There is pressure applied on the shell at both of those "capped" sides. To build the cylinder all I did was define a rectangle that is symmetrical around the axis. Defined all the boundaries as "shell" (giving it a certain thickness through the shell modulus) and defined the domain as "water" (maybe that's wrong?)

I have added fluid-shell interaction all around the shell (I had to specify laminar flow to do this). What I am trying to model is see the deformation of the shell at each of those capped ends due to the pressure and subsequent internal water flow. I've tried a stationary study which works but is definitely not accurate as in order for it to run I have to have a fixed constrain on one of the faces of the cylinder and also there is no water flow. For the time-dependent study, COMSOL doesn't converge.

I am not sure what I am doing wrong. I feel like this should be simple to do but apparently not. Any ideas?


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