Please check your Hydrodynamic Diffraction model
(1) For each water-piercing structure, "Generate Internal Lid" is set as Yes.
(2) If there are multiple structures in the hydrodynamic interaction group, the external lid is introduced to suppress the standing waves between the gaps of the strutures.
(3) Define more wave frequencies.
In the time domain analysis, define some roll/pitch nonlinear dampings if they exist.
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