• PhD,
  • M.R.E.,

PhD Defense - Marie ROBERT - ED SPI

"Numerical modelling of the hydroelastic behavior of vessels in nonlinear waves"

On December 18, 2017 from 14:30 To 17:00

Monday 18 December at 2.30 pm in Lecture Theatre S, Centrale Nantes.

Members of the Board of Examiners:

 - Jacques André Astolfi,  Ecole Navale
 - Bettar Ould el Moctar, Université de Duisburg
 - Hervé le Sourne, ICAM
 - Bernard Molin, Ecole Centrale de Marseille
 - Charles Monroy, Bureau Veritas (guest)
 - Pierre Ferrant, supervisor
 - Antoine Ducoin, co-supervisor


The increase of large ships dimensions shifts their structural natural frequencies towards common wave frequencies, inducing more interactions between the classic seakeeping response and the structural response. Accurate modeling of wavestructure interactions becomes a key issue for architects and classification societies during the design of a ship. In this respect, a new numerical tool for fluid-structure interaction is developed, combining a finite difference RANSE description of the fluid domain with ICARE-SWENSE and an analytic beam model, within a modal approach. Thanks to the use of a simple formulation for the structure part, the tool inherits ICARE-SWENSE tolerance properties with regard to large time steps, while still taking into account hydrodynamic nonlinear effects. Results presented for a flexible barge in diffraction and radiation according to flexible modes validate the first steps of the coupling procedure. Special consideration is given to hydrodynamic non linearities threshold and their impact on the structural response. A first implementation is shown for the resolution of the equation of motion for the elastic degrees of freedom. Parametric studies on ship resistance in both regular and bichromatic waves are included as a stepping stone towards future simulations of ship hydroelasticity in irregular waves.
Published on December 11, 2017 Updated on December 12, 2017