Investigation on hydrodynamic characteristics, wave-current interaction, and sensitivity analysis of submarine hoses attached to a CALM buoy

Amaechi, Chiemela Victor and Wang, Facheng and Ye, Jianqiao (2022) Investigation on hydrodynamic characteristics, wave-current interaction, and sensitivity analysis of submarine hoses attached to a CALM buoy. Journal of Marine Science and Engineering (JMSE), 10 (1). ISSN 2077-1312

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Abstract

There is an increase in the utilisation 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, the numerical model was developed using a coupling method modelled by utilising ANSYS AQWA and Orcaflex dynamic models of the CALM buoy hoses. Two cases were compar-atively 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 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 configured easily to suit the designer’s need, seabed soil type, seabed topography, and the profiles are useful for manu-facturers. The sensitivity analysis also shows the effect of hose parameters on its hydrodynamic behaviour from wave-current interaction (WCI).