Abstract
For the new concept of floating production, storage and offloading unit (FPSO), the unique sandglass-type shape of its floating body can effectively reduce heave motion responses. However, this design feature may also generate distinct flow characteristics during towing. In this paper, the numerical method was established and validated to successfully predict the towing performance of the sandglass-type model by comparing it with the model experiment of a polar ocean nuclear energy platform with the sandglass-type shape. On this basis, the analysis incorporates both a local model of the underwater body without a free surface and a global model of the floating body with a free surface to analyze towing resistances. Specifically, the paper focuses on the frictional resistance and pressure resistance of sandglass-type models versus various draughts. Furthermore, the influence of free surface on various kinds of resistances and the towing resistances of sandglass-type FPSO with different speeds were studied. Finally, concluding remarks and future perspectives are presented.
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