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RISS 인기검색어
- 검색키워드
- 저자 : Jørgen Juncher Jensen (검색결과 2 건)
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Stochastic procedures for extreme wave induced responses in flexible ships
Jørgen Juncher Jensen,Ingrid Marie Vincent Andersen,Sopheak Seng 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
Different procedures for estimation of the extreme global wave hydroelastic responses in ships arediscussed. Firstly, stochastic procedures for application in detailed numerical studies (CFD) are outlined. The use ofthe First Order Reliability Method (FORM) to generate critical wave episodes of short duration, less than 1 minute,with prescribed probability content is discussed for use in extreme response predictions including hydroelastic behaviourand slamming load events. The possibility of combining FORM results with Monte Carlo simulations is discussedfor faster but still very accurate estimation of extreme responses. Secondly, stochastic procedures using measured timeseries of responses as input are considered. The Peak-over-Threshold procedure and the Weibull fitting are applied anddiscussed for the extreme value predictions including possible corrections for clustering effects.
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Global hydroelastic model for springing and whipping based on a free-surface CFD code (OpenFOAM)
Sopheak Seng,Jørgen Juncher Jensen,Šime Malenica 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
The theoretical background and a numerical solution procedure for a time domain hydroelastic code arepresented in this paper. The code combines a VOF-based free surface flow solver with a flexible body motion solverwhere the body linear elastic deformation is described by a modal superposition of dry mode shapes expressed in alocal floating frame of reference. These mode shapes can be obtained from any finite element code. The floating frameundergoes a pseudo rigid-body motion which allows for a large rigid body translation and rotation and fully preservesthe coupling with the local structural deformation. The formulation relies on the ability of the flow solver to provide thetotal fluid action on the body including e.g. the viscous forces, hydrostatic and hydrodynamic forces, slamming forcesand the fluid damping. A numerical simulation of a flexible barge is provided and compared to experiments to show thatthe VOF-based flow solver has this ability and the code has the potential to predict the global hydroelastic responsesaccurately.
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