Mike Pettit
Ansys Employee


The best approach for modelling active heave compensation is to use Aqwa's user-defined force (UDF) functionality. This allows you to connect the time domain Aqwa solver to a Python server, which calls a Python function at each computational time-step. The solver passes the structure COG position and velocity at that time-step to the Python function, and this returns the forces/moments that should be applied by the solver for that time-step at each structure's COG.

The Python server code is provided, along with some example UDFs, in your Ansys installation: e.g. C:\Program Files\ANSYS Inc\v231\aqwa\utils\ExternalForceCalculation. You can code the Python function to do anything you like, as long as the additional forces/moments can be determined as a function of the structure's COG position and velocity.

I'm afraid I can't provide any other coded examples beyond those available in the Ansys installation, but I'm happy to answer any other questions you might have.

Cheers, Mike