Hydroelastic modelling for the prediction of wave induced loads on bulk carriers
Hydroelastic modelling for the prediction of wave induced loads on bulk carriers
The relatively high rates of bulk carrier casualties in recent years make this vessel type a suitable example for investigating the influence of hydroelastic modelling on the fluid-structure interactions and subsequent loads and responses in waves as opposed to the empirical and quasi-static methods which are traditionally used. Two- and three-dimensional fluid-flexible structure interaction models, due to their different degree of complexity and associated data requirements, can be used at different stages of the design process when estimating wave-induced loads, namely preliminary and detailed design stages respectively.
For the purposes of the current investigation, therefore, two- and three-dimensional hydroelasticity theories are applied to predict and compare the steady state dynamic behaviour of a bulk carrier hull, based on OBO MV Derbyshire, in regular waves. Both symmetric and antisymmetric motions and distortions are incorporated in these investigations.
Problems encountered during the structural modelling stage, for all idealisations, are briefly outlined, with particular emphasis to modelling hatch openings shear center and warping. Whilst the three-dimensional finite element model consists entirely of shell elements, representing all the major external and internal structural components, the two-dimensional simulation is implemented by means of Timoshenko beam-like finite element and difference discretisations. In vacuo dynamic characteristics (natural frequencies, mode shapes, modal stress shear forces and bending moments) are discussed and compared for all models, again with special emphasis upon identifying the influences of hatch openings, shear center and warping on the antisymmetric dynamics of the structure. For the wet analysis the fluid structure interaction is carried out using two-dimensional (Timoshenko beam and strip theories) and three-dimensional (finite element idealisation and potential flow analysis based on pulsating source distribution over the mean wetted surface) analyses. Comparisons are made between responses, such as vertical, horizontal and torsional moments, shear forces as well as direct stresses predicted by two- and three-dimensional models in regulate waves for a range of headings, speeds and ship- to wave-length aspect ratios.
University of Southampton
Hirdaris, Spyridon E
f272924c-1c9c-4785-9f59-07dda4c6eaef
2002
Hirdaris, Spyridon E
f272924c-1c9c-4785-9f59-07dda4c6eaef
Hirdaris, Spyridon E
(2002)
Hydroelastic modelling for the prediction of wave induced loads on bulk carriers.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The relatively high rates of bulk carrier casualties in recent years make this vessel type a suitable example for investigating the influence of hydroelastic modelling on the fluid-structure interactions and subsequent loads and responses in waves as opposed to the empirical and quasi-static methods which are traditionally used. Two- and three-dimensional fluid-flexible structure interaction models, due to their different degree of complexity and associated data requirements, can be used at different stages of the design process when estimating wave-induced loads, namely preliminary and detailed design stages respectively.
For the purposes of the current investigation, therefore, two- and three-dimensional hydroelasticity theories are applied to predict and compare the steady state dynamic behaviour of a bulk carrier hull, based on OBO MV Derbyshire, in regular waves. Both symmetric and antisymmetric motions and distortions are incorporated in these investigations.
Problems encountered during the structural modelling stage, for all idealisations, are briefly outlined, with particular emphasis to modelling hatch openings shear center and warping. Whilst the three-dimensional finite element model consists entirely of shell elements, representing all the major external and internal structural components, the two-dimensional simulation is implemented by means of Timoshenko beam-like finite element and difference discretisations. In vacuo dynamic characteristics (natural frequencies, mode shapes, modal stress shear forces and bending moments) are discussed and compared for all models, again with special emphasis upon identifying the influences of hatch openings, shear center and warping on the antisymmetric dynamics of the structure. For the wet analysis the fluid structure interaction is carried out using two-dimensional (Timoshenko beam and strip theories) and three-dimensional (finite element idealisation and potential flow analysis based on pulsating source distribution over the mean wetted surface) analyses. Comparisons are made between responses, such as vertical, horizontal and torsional moments, shear forces as well as direct stresses predicted by two- and three-dimensional models in regulate waves for a range of headings, speeds and ship- to wave-length aspect ratios.
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Published date: 2002
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Local EPrints ID: 464710
URI: http://eprints.soton.ac.uk/id/eprint/464710
PURE UUID: 036aa4b7-d350-482f-bb12-725e1a415a77
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Date deposited: 04 Jul 2022 23:58
Last modified: 16 Mar 2024 19:43
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Author:
Spyridon E Hirdaris
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