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Finite element modelling of hydroelasticity in hull-water impacts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7542-3225
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The work in this thesis focuses on the use of explicit finite element analysis (FEA) in the modelling of fluid-structure interaction of panel-water impacts. Paper A, considers modelling of a two-dimensional rigid wedge impacting a calm water surface. From analytical methods and results of a systematic parameter study a generalised approach for determination of fluid discretization and contact parameters in the modelling of arbitrary hull-water impact situations is developed and presented. In paper B the finite element modelling methodology suggested in paper A is evaluated for elastic structures by a convergence study of structural response and hydrodynamic load. The structural hydroelastic response is systematically studied by a number of FE-simulations of different impact situations concerning panel deadrise, impact velocity and boundary conditions. In paper B a tentative method for dynamic characterization is also derived. The results are compared with other published results concerning hydroelasticity in panel water impacts. The long-term goal of this work is to develop design criteria, by which it can be determined whether the loading situation of a certain vessel type should be regarded as quasi-static or dynamic, and which consequence on the design a dynamic loading has.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , 32 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2006:93
Keyword [en]
fluid-structure interaction, hydroelasticity, hull-water impact, high-speed craft, slamming, explicit finite element methods
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4304ISBN: 978-91-7178-548-0 (print)OAI: oai:DiVA.org:kth-4304DiVA: diva2:11713
Presentation
2007-03-20, Sal D3, KTH, Lindstedtsvägen 5, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101126Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2010-11-26Bibliographically approved
List of papers
1. Explicit FE-modelling of fluid-structure interaction in hull-water impacts
Open this publication in new window or tab >>Explicit FE-modelling of fluid-structure interaction in hull-water impacts
2006 (English)In: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 53, no 2, 103-121 p.Article in journal (Refereed) Published
Abstract [en]

The paper considers explicit FE-modelling of fluid-structure interaction in hull-water impacts. To minimize the variables studied and to enable comparison with analytical methods, the problem is here idealised as a two-dimensional rigid wedge impacting on a calm water surface. A parameter study is performed, where the sensitivity in the mesh resolution and the contact parameter selection is investigated. It is concluded that a numerically stable non-leaking solution to the hull-water impact problem, with good correlation to analytical results, is achievable. It is however also concluded that application of this modelling technique can be costly and far from trivial. The solution is for example highly dependent on the relation between mesh-density and contact-stiffness. Successful modelling hence requires rational approaches for determination of fluid discretization and contact parameters. By making reference to an analytical solution of the hull-water impact problem, the results from the parameter study are generalised, and a rational approach for determination of fluid discretization and contact parameters in the modelling of arbitrary hull-water impact situations is presented. The generality of the approach is favourably demonstrated for different impact angles and velocities.

Keyword
Explicit FEA; Fluid-structure interaction; High-speed craft; Hull-water impact; Slamming
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-6876 (URN)2-s2.0-34547546367 (Scopus ID)
Note
QC 20100810Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2017-12-14Bibliographically approved
2. Explicit FE-modelling of hydroelasticity in panel-water impacts
Open this publication in new window or tab >>Explicit FE-modelling of hydroelasticity in panel-water impacts
2007 (English)In: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 54, no 2-3, 111-127 p.Article in journal (Refereed) Published
Abstract [en]

This paper considers modelling of hydroelasticity in water impacts of ship-hull bottom-panels by use of explicit finite element methods. The finite element analysis is based on a multi-material arbitrary Lagrangian-Eulerian formulation and a penalty contact algorithm. This modelling technique enables the modelling of the instantaneous fluid-structure interaction. The FE-modelling of elastic panel-water impacts is evaluated by a convergence study and by comparison with experiments. Hydroelastic effects on the panel response are systematically studied for different impact velocities, boundary conditions and structural mass. It is concluded that hydroelastic effects can result in a significant reduction of the structural response for certain combinations of panel deadrise, impact velocity and boundary conditions. Inertia effects are shown to be dominated by added water mass. The present study is compared with other published work concerning hydroelasticity in panel-water impacts.

Keyword
Explicit finite element modelling; Fluid-structure interaction; High-speed craft; Hull-water impact; Hydroelasticity; Slamming
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-6877 (URN)2-s2.0-35148831820 (Scopus ID)
Note
QC 20100810Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2017-12-14Bibliographically approved

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