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Explicit FE-modelling of fluid-structure interaction in hull-water impacts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Marina system)ORCID iD: 0000-0001-7542-3225
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Marina system)ORCID iD: 0000-0002-8343-5098
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Marina system)ORCID iD: 0000-0003-3337-1900
2006 (English)In: International Shipbuilding Progress, ISSN 0020-868X, 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.

Place, publisher, year, edition, pages
2006. Vol. 53, no 2, 103-121 p.
Keyword [en]
Explicit FEA; Fluid-structure interaction; High-speed craft; Hull-water impact; Slamming
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6876Scopus ID: 2-s2.0-34547546367OAI: oai:DiVA.org:kth-6876DiVA: diva2:11711
Note
QC 20100810Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2010-08-10Bibliographically approved
In thesis
1. Finite element modelling of hydroelasticity in hull-water impacts
Open this publication in new window or tab >>Finite element modelling of hydroelasticity in hull-water impacts
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
fluid-structure interaction, hydroelasticity, hull-water impact, high-speed craft, slamming, explicit finite element methods
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4304 (URN)978-91-7178-548-0 (ISBN)
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
2. Hydroelasticity in Marine Hull Bottom Panels - Modeling and Characterization
Open this publication in new window or tab >>Hydroelasticity in Marine Hull Bottom Panels - Modeling and Characterization
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work in this thesis is concerned with the localized problem of hydroelasticity in marine panel-water impacts with an overall aim to increase the efficiency of high-speed craft by application of more refined methods in the structural design. The work mainly focuses on numerical modeling of the hydroelastic problem and therewith related aspects in the modeling and characterization of hydroelasticity. In addition, the work also addresses aspects regarding design methods of high-speed craft and experimental analysis of hydroelasticity.

Two-dimensional panel-water impacts are simulated by using the commercial finite element code LS-DYNA. For the modeling of the panel-water impact situations a generalized approach for determination of fluid discretization and contact parameters is derived and extensively used throughout this work. The hydroelastic problem is studied through systematic series of numerical simulations regarding different impact situations. The work advances the understanding of the hydroelastic problem and introduces concepts such as kinematic and inertia related hydroelastic effects. The work further presents hydroelastic effects in contrast to previously published results, in the sense that it may not be conservative to ignore hydroelasticity in the structural design. This increase in the structural response when accounting for hydroelasticity can partly be related to kinematic effects, and partly to inertia related added mass effects. The results further show that, the effects of hydroelasticity increase with increased impact velocity, increased panel width, decreased deadrise angle, decreased panel flexural and in-plane stiffness, and decreased rotational and in-plane fixation at the boundaries.

A tentative method is derived to characterize the hydroelastic problem, which, despite its simplicity and limitations, is found to successfully capture the complexity of the hydroelastic interaction in the design of the experimental setup. The experimental water slam testing of composite hull panels are conducted to study the effect of hydroelasticity for panels with different stiffnesses. The observed hydroelastic effects included changes in panel geometry, local velocity and hydrodynamic pressures. These effects also correlate with the observed hydroelastic effects from the numerical simulations.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xi, 20 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2009:42
Keyword
fluid-structure interaction, hydroelasticity, hull-water impact, high-speed craft, slamming, explicit finite element methods
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-10903 (URN)978-91-7415-389-7 (ISBN)
Public defence
2009-09-16, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20100810Available from: 2009-09-02 Created: 2009-08-12 Last updated: 2010-08-10Bibliographically approved

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Stenius, IvanRosén, AndersKuttenkeuler, Jacob

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