TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractPrincipia R.D. is the leader of the CALM BUOY JIP, which purposeis to study the behavior of deepwater CALM Buoys systems. The final objective is to provide guidelines for the analysis of deepwater offloading systems covering the main aspects related to the OOL/mooring lines fatigue analysis. Most of the attention is focused on the buoy hydrodynamics using both experimental campaigns and numerical investigations (full and model scales). Captive tests and forced oscillations tests at scale of 1/25 were performed with different skirt dimensions and drafts characteristic of a typical buoy.A new methodology and formulation is derived for damping estimation which is a key point of the analysis. The various damping formulations are implementedand tested in a fully coupled buoy / lines finite element solver. The results are validated against experimental measurememts in regular and irregular waves. Recommendations are deduced on the "model of model" approach classicaly used for model tests.Finally, use of CFD calculations to replace forced oscillations tests is also explored through comparisons with model tests. CFD appears to be a reliable tool to assess scale effects and to compare buoy geometries.
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