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Hydroelasticity in Marine Hull Bottom Panels
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0001-7542-3225
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-8343-5098
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0003-3337-1900
2009 (English)Article in journal (Refereed) Submitted
Abstract [en]

The paper considers the hydroelastic interaction involved in panel- water impacts of high-speed craft. Hydroelastic panel-water impacts are simulated by using the finite element code LS-DYNA and a simplified in- house developed method. The mechanisms involved in the problem are stud- ied by a systematic series of simulations regarding different impact veloc- ities, deadirse angels, boundary conditions, membrane effects, and panel properties. The significance of hydroelasticity on the problem is studied by comparing with methods addressing the problem as completely separable and quasi-static. It is shown that membrane effects can have a large influ- ence on the hydroelastic problem. The results further show that, accounting for hydroelasticity may yield larger maximum deflections and strains com- pared to completely separated and quasi-static solutions. The increase in the structural response when accounting for hydroelasticity can partly be explained by kinematic boundary condition effects, and partly by inertia related added mass effects.

Place, publisher, year, edition, pages
2009.
Keyword [en]
hydroelastic, fluid-structure interaction, dynamic charac- terization, slamming, high-speed craft
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10991OAI: oai:DiVA.org:kth-10991DiVA: diva2:233768
Note
QS 20120315Available from: 2009-09-02 Created: 2009-09-02 Last updated: 2012-03-15Bibliographically approved
In thesis
1. 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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