Mike Pettit
Ansys Employee

Unfortunately I’m not allowed to download anything from this forum – if you have a customer account, please create a Support Request on the Customer Portal and upload the files there (or contact your account manager/channel partner).

For a small buoy structure I would expect that the Keulegan-Carpenter number is relatively large, i.e. the drag forces are significant compared to the diffraction forces. It sounds like you may need to add some drag modelling to your Aqwa model, which you can do by including Morison Disc elements on each end of the buoy cylinder; and/or by adding Morison Hull Drag/Current Force Coefficients tables, and defining appropriate force coefficients for the structure.