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Displacement convergence in System Coupling

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Old   November 24, 2023, 16:32
Default Displacement convergence in System Coupling
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Davide
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Hi everyone,

I am running a two-way Fluent-Mechanical simulation of a plate(100x3x200mm; xyz) immersed in a tank (300x500x300mm; xyz) filled with a liquid and a gas using VOF method. The tank is subject to the force of gravity. I am having a hard time in reaching the convergence of the displacement on the Coupling Interface, the plate, (see screenshot below) which means endless simulations.
Actually I would like to understand better what I am dealing with. The convergence is related to the RMS change, which basically is telling me how much the variable is changing between two iterations. Why is the force reaching convergence so easily on the coupling interface and the displacement keeps changing? Is it related to Fluent or Mechanical setup, to the time-step chosen, to the mesh? I have tried to read the SC User's Guide but it doesn't help me so much.

Can anyone clarify me this point and/or give me a solution?
Feel free to ask any other information that you may need. Thanks in advance.
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