Elasto-Capillary Modelling: Unphysical Shell Behaviour

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Hello everyone! I have the following problem: I am simulating rise of water in a thin 1mm diameter capillary of thickness 0.01 mm with E=0.1 MPa. The study is fully coupled, with Shell/ Solid mechanics (quasi-static) + Phase Field + Laminar modules.

The dynamic study is run, with correct nature of rise & pressure profile (being negative in liquid until a drop across meniscus back to 0 Pa in liquid). The Shell should be loaded accordingly, but the radial deformation shows bulges near boundary (clamped-clamped) & after the meniscus. I have tried to run the study with solid mechanics module but the same results are posted.

I deeply appreciate any & all help!

Link to MPH file (due to size constraint) drive.google.com/file/d/1kWlDMgmLYpuZfzxJBrw-nLSP4J55cRtm/view?usp=sharing



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