Yes, in this thread that you mentioned i showed how the the total displacment of the tube was unreasonalble, almost as if the tube is exploding. This issue happens only when i reduce the time step size to 0.001. I need to reduce the time step size to this amount since i need to capture a cyclic loading i am planning to introduce on the tube. I am not sure what the nature of this instability is. After doing my own research this issue in FSI is not uncommon, and it has been suggested, to my understanding, that combining a coarse mesh with small time step size can result in such instabilities. In the system coupling transcripts (when running the simulation) it is visible that the forces are not converginging at the interface.
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