Reply To: ANSYS AQWA RAO in irregular wave

[Shuangxing Du]

What are the ratios of the wave amplitudes and the model sizes in the model tests?  In the blue-line and orange-line floats, some or all the hull surfces near mean water level are not in vetical, the non-linear effects will be involved in the model tests if the wave amplitudes are relatively high. The incident wave may also not be the Airy wave (linear wave) at higher wave frequencies.  If it is the case, please try to run the time domain hydrodynamic response in the regular wave, the response amplitude divided by the incident wave amplitude could be more comparable to the model test data, as this time domain response data contains the nonlinear hydrodynamic and hydrostatic effects.  The frequencies in the RAO output in the frequency domain statistic analyis are determined by the program, among which the refined frequency points are given at (1) peak frequency of the wave spectrum, (2) response natural frequencies.