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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.
Global hydroelastic analysis of ultra large container ships by improved beam structural model
Ivo Senjanović,Nikola Vladimir,Marko Tomić,Neven Hadžić,Šime Malenica 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
Some results on the hydroelasticity of ultra large container ships related to the beam structural modeland restoring stiffness achieved within EU FP7 Project TULCS are summarized. An advanced thin-walled girder theorybased on the modified Timoshenko beam theory for flexural vibrations with analogical extension to the torsionalproblem, is used for formulation of the beam finite element for analysis of coupled horizontal and torsional ship hullvibrations. Special attention is paid to the contribution of transverse bulkheads to the open hull stiffness, as well as tothe reduced stiffness of the relatively short engine room structure. In addition two definitions of the restoring stiffnessare considered: consistent one, which includes hydrostatic and gravity properties, and unified one with geometric stiffnessas structural contribution via calm water stress field. Both formulations are worked out by employing the finiteelement concept. Complete hydroelastic response of a ULCS is performed by coupling 1D structural model and 3Dhydrodynamic model as well as for 3D structural and 3D hydrodynamic model. Also, fatigue of structural elementsexposed to high stress concentration is considered.