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Global hydroelastic model for springing and whipping based on a free-surface CFD code (OpenFOAM)
Seng, Sopheak,Jensen, Jorgen Juncher,Malenica, Sime The Society of Naval Architects of Korea 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 are presented in this paper. The code combines a VOF-based free surface flow solver with a flexible body motion solver where the body linear elastic deformation is described by a modal superposition of dry mode shapes expressed in a local floating frame of reference. These mode shapes can be obtained from any finite element code. The floating frame undergoes a pseudo rigid-body motion which allows for a large rigid body translation and rotation and fully preserves the coupling with the local structural deformation. The formulation relies on the ability of the flow solver to provide the total fluid action on the body including e.g. the viscous forces, hydrostatic and hydrodynamic forces, slamming forces and the fluid damping. A numerical simulation of a flexible barge is provided and compared to experiments to show that the VOF-based flow solver has this ability and the code has the potential to predict the global hydroelastic responses accurately.
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.
Stochastic procedures for extreme wave induced responses in flexible ships
Jensen, Jorgen Juncher,Andersen, Ingrid Marie Vincent,Seng, Sopheak The Society of Naval Architects of Korea 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 are discussed. Firstly, stochastic procedures for application in detailed numerical studies (CFD) are outlined. The use of the 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 behaviour and slamming load events. The possibility of combining FORM results with Monte Carlo simulations is discussed for faster but still very accurate estimation of extreme responses. Secondly, stochastic procedures using measured time series of responses as input are considered. The Peak-over-Threshold procedure and the Weibull fitting are applied and discussed for the extreme value predictions including possible corrections for clustering effects.
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.
최영명,Bouscasse Benjamin,Ducrozet Guillaume,Seng Sopheak,Ferrant Pierre,김은수,김영준 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
An efficient methodology for simulating nonlinear irregular waves in a Computational Fluid Dynamics (CFD) solver is proposed. The High Order Spectral (HOS) method is used to generate nonlinear irregular waves in an open ocean and a numerical wave tank. The inverse Fast Fourier Transforms (FFTs) and multi-dimensional interpolation from the HOS simulation results are used for the efficient reconstruction of nonlinear waves in the CFD solver. The proposed procedure is published as an open-source project called Grid2Grid, which is developed to interface with a generic CFD solver. It provides the function Application Programming Interface (API), which can communicate with different programming languages. Extreme wave events were used to validate the proposed procedure. The predicted wave breaking events are reported both in OpenFOAM CFD and HOS simulations, and the wave elevations of CFD during simulations show good agreement with experiments and with HOS simulation.