Thank you for your response. and other question is that why when I get RAO from Hydrodynamic Diffraction analysis , the RAO starts from 1 at freq=0 (which is correct), but when I get RAOs in Hydrodynamic Response in irregular wave, RAO at freq=0 is not 1!!! and also, the Natural frequency( I mean the peak of curve) are not align?
in HD part, what is the specification of wave?
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