The study of the flow around an array of vertical cylinders in a wavy field is a relevant subject in the field of offshore engineering. The project of any offshore structure cannot be considered without an analysis of wave-body interaction for several reasons. For instance, the loads exerted on the bodies strongly depend on the interference of incoming and diffracted waves. Moreover, this interference can generate local wave elevations considerably greater than that of the undisturbed wave and, of course, the platform deck has to be sufficiently higher than the wave crest under storm conditions, in order to avoid slamming effects, but not too high, in order to limit the height of the centre of gravity. The aim of this work is a preliminary study of the flow generated by a steep incoming wave impinging on a typical configuration of offshore platforms, that is four cylinders placed at the vertices of a square, in view of a more comprehensive analysis that will include viscous effects and strong non-linearities such as wave breaking. Different directions of the incoming waves are considered in order to evaluate the influence of the wave-front angle on the loads and run-ups on each cylinder, as well as on 'upwelling' in the interior of the cylinder configuration. The discretization of the fluid domain has been made easy and efficient by the use of a chimary method for the generation of computational mesh. The free-surface has been simulated by a single-phase level of approach.
Numerical simulation of the flow around an array of free-surface piercing cylinders in waves
Numerische Simulation der Strömung um eine Anordnung von eine freie Oberfläche durchdringenden Zylindern im Seegang
Ship Technology Research / Schiffstechnik ; 54 , 1 ; 43-52
2007
10 Seiten, 16 Bilder, 13 Quellen
Article (Journal)
English
Numerical Simulation of the Flow around an Array of Free-Surface Piercing Cylinders in Waves
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