Learning Forum

[NVN NAMMA]

I am carrying out time-domain simulations of a floating offshore platform in ANSYS AQWA under irregular wave and current conditions. I would like clarification on the following points:

1. In irregular wave time-response analyses, under what conditions are second-order wave forces included? Specifically, is the computation of QTFs during the diffraction analysis sufficient for these forces to be applied in the time-domain response, or is an additional setting required?

2. Regarding current loading, if a depth-varying current velocity profile is defined, how are the corresponding current-induced loads on the platform hull evaluated? Are hull current drag forces applied automatically, or do they require explicit definition of current drag coefficients?

3. Finally, how are current and wave loads treated with respect to the mooring system, are hydrodynamic forces on mooring lines considered by default, or only their structural restoring effects?

Any clarification on the underlying assumptions and recommended practice would be greatly appreciated.