ORCAFLEX METOCEAN COORDINATE SYSTEM WAVE AND WIND FULL
Finally, to assess the feasibility of the hull and riser system, the numerical results of a hybrid approach, full scale, coupled riser analysis are presented, as based on measured hull motions and environmental conditions. The importance of viscous effects on motions of the cylindrical unit and of the green water effect is discussed. Model test results, including motions and mooring loads, are compared with numerical predictions for a series of test cases. Thus, the model test provides better understanding of the new concept performance. This combination implicates complex hydrodynamic behavior of the hull, mooring and riser system. The process of analysis includes extreme hurricane waves, wind, and currents, combined with ultra deep water, to demonstrate the feasibility of the concept in the GoM. The model was subjected to the Central GoM Hurricane environmental conditions. The experiments were performed at a scale of 1:64. The present work focuses on model testing of the cylindrical FPSO hull design, performed at the Offshore Technology Research Center (OTRC) at Texas A&M University in College Station, in May 2016. This paper documents Phase 2 of a UDW RPSEA study which had as its main objective the validation of a production concept based on a permanently moored cylindrical FPSO designed by Sevan Marine with steel catenary risers (SCR).
To address the challenges of Gulf of Mexico (GoM) Lower Tertiary exploitation, alternative FPSO concepts are studied by the industry.