,nYou could have a look at the explicit dynamics theory guide Chapter 5: Explicit Dynamics Theory Guide (ansys.com) for understanding the equations and the solution methodology. Section 5.2.6. Explicit Fluid Structure Interaction (Euler-Lagrange Coupling) (ansys.com) might be specifically helpful. Also, if you want to simulate sloshing do check out fluid80 (and other similar) elements FLUID80 (ansys.com). Also, have a look at
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