Reply To: Issues : Ocean Environment / Offshore add-on in Transient Structural Analysis

[Mike Pettit]

Hello,

Generally, the Offshore add-on is used to apply hydrodynamic loading to a model following the Morison equation. Therefore most objects in the Offshore add-on only apply to beams/pipes (line bodies), where we can assume that the drag is more significant than any diffraction effect (which is not included in the Morison equation). I guess you're working with a solid/surface model? Can you share any more information about the geometry you're working with?

If you want to generate hydrodynamic loads on surfaces (or faces of solids), you need to use Aqwa-Mechanical mapping via the Hydrodynamic Pressure add-on. You can only map to a Static Structural analysis, but you can map for multiple time steps from a time domain Hydrodynamic Response analysis. Each hydrodynamic time step is treated as an independent structural load step, but the hydrodynamic accelerations are also applied, so it is only the local inertia loads that are not accounted for.

You can find the Hydrodynamic Pressure user guide here.

I hope this helps, please let me know if you need any more information.

Mike