Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/118271
Title: Very Large Floating Structures
Authors: MRINALINI MUKESHDUTTA PATHAK
Keywords: hydroelastic response, VLFS, sloping seabed, aspect ratio
Issue Date: 21-Aug-2014
Source: MRINALINI MUKESHDUTTA PATHAK (2014-08-21). Very Large Floating Structures. ScholarBank@NUS Repository.
Abstract: In order to understand the hydroelastic behaviour of VLFS under various sea states and seabed conditions, parametric studies are undertaken in this thesis. The behaviour of the most commonly used, rectangular VLFS of different aspect ratios subjected to different wavelengths and water depths is studied in detail. Since a VLFS is generally connected to the land and deployed in near-shore regions, the effect of varying seabed topography are also presented herein. In addition to overall hydroelastic responses of VLFS, the end deflections which are usually largest in magnitude are also studied for different situations. To idealize the physical VLFS system, an equivalent numerical model is considered in terms of a plate floating on a fluid domain. The VLFS is modelled as an isotropic, elastic and flat Mindlin plate with free edges. The fluid is assumed to be ideal, incompressible, inviscid and irrotational so that the velocity potential exists.The main objective of the hydroelastic analysis is to determine the fluid velocity potentials and plate displacements in given boundary conditions. In order to decouple the fluid?structure interaction problem, the modal expansion method is adopted for the hydroelastic analysis which is carried out in the frequency domain. Boundary element method is used to solve the Laplace equation for the velocity potential and finite element method is employed for solving the equations of motion of the floating plate.
URI: http://scholarbank.nus.edu.sg/handle/10635/118271
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