Author(s): Thomas Arya; V. K. Srineash; Manasa Ranjan Behera

Linked Author(s):

Keywords: CFD; REEF3D; Floating offshore platforms; Wave impact; Wave-structure interaction

Abstract: Wave-in-deck loading is a complex nonlinear phenomenon affecting marine structures’ reliability and structural integrity. Apart from the usual waves in the sea, these structures are also subjected to extreme waves, which induce significant loadings. Another design consideration is the air-gap, which is the vertical distance measured from extreme sea-surface elevation (crest) to the underside of the deck. This distance gets reduced during an extreme event, causing additional higher magnitude forces than the design load. The air-gap position also creates unnecessary pressure loads due to the entrapment of air inside during the event. Studies are being carried out on fixed offshore platforms. However, such analysis is still immature on the floating offshore platforms and requires attention. In the present study, a regular wave interaction with a vertical cylindrical floating body is examined. The investigation is done using an open-source numerical tool, REEF3D. The validation of this tool is carried out using the experimental work from the past literature. In the present work, a free heave decay test is carried out and compared with the experimental results from the past literature. Further, the wave interaction with the unmoored floating cylinder is studied by subjecting the cylindrical structure to regular waves. Based on the study, it is noticed that the CFD tool REEF3D is able to simulate the wave-structure interaction process and the validation exercise is satisfactory. The study is planned to further extend to carry out a parametric investigation involving the effect of wave parameters on the responses of the floating vertical cylinder. Further, the moored floating body dynamics under waves will be studied in the future.

DOI: https://doi.org/10.1007/978-981-97-6009-1_3

Year: 2022