Abstract
There is an increase in the utilization of the floating offshore structure (FOS) called Catenary Anchor Leg Mooring (CALM) buoys and the attached marine hoses due to the increasing demand for oil and gas products. These hoses are flexible and easier to use but have a short service life of about 25 years. They are adaptable in ocean locations of shallow, intermediate and deep waters. In this research, a numerical model was developed using a coupling method modeled by utilizing ANSYS AQWA and Orcaflex (Orcina Ltd., Ulverston, UK) dynamic models of the CALM buoy hoses. Two cases were comparatively studied: Lazy-S and Chinese-lantern configurations, under ocean waves and current. Comparisons were also made between coupled and uncoupled models. This research presents the hydrodynamic characteristics with a sensitivity analysis on the influence of waves, current attack angle, soil gradient, soil stiffness and environmental conditions that influence the performance of marine hoses. The study comparatively looked at the configurations from dynamic amplification factors (DAF) on marine hoses. The results show that marine hoses can be easily configured to suit the designer’s need, seabed soil type, seabed topography and the profiles that are useful for manufacturers. The sensitivity analysis also shows the effect of hose parameters on its hydrodynamic behavior from the wave–current interaction (WCI).
Highlights
Publisher’s Note: MDPI stays neutralIn recent times, applications of bonded flexible risers, unbonded flexible risers, composite risers and marine hoses have increased in the marine industry [1,2,3,4,5,6,7,8,9]
The influence of hydrodynamic loads on Catenary Anchor Leg Mooring (CALM) buoy submarine hoses has been observed to have an influence on the hose-string curvature, effective tension and the bending moment
High.,aanumber numbera formations number of curvature distributions are observed from the behavior of the submarine hoses ofcurvature curvaturedistributions distributionsare areobserved observedfrom fromthe thebehavior behaviorof ofthe thesubmarine submarinehoses hosesvia via dyof dy◦ flow via dynamic analysis
Summary
Applications of bonded flexible risers, unbonded flexible risers, composite risers and marine hoses have increased in the marine industry [1,2,3,4,5,6,7,8,9] This is due to the need for more flexible offshore platforms and lighter sustainable materials [10,11,12,13,14,15,16,17]. Larger floating offshore structures (FOS), such as Paired Column Semisubmersibles (PCSemis), FPSOs and Very Large Floating Structures (VLFS), do not have such flexibility [26,27,28,29,30,31,32,33] They require a larger area on the sea for installation and operation, unlike the CALM buoy hose systems. The classification of marine hoses includes submarine hoses, with regard to jurisdictional claims in published maps and institutional affiliations
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