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Development of a fast and reliable solver based on simplified formulae for ship grounding analyses

Abstract : Although non-linear finite element method is the most accurate approach for ship grounding damage analyses, its high computing cost makes it unsuitable when numerous scenarios have to be simulated. As part of the European research project FLARE (Flooding Accident REsponse), this PhD thesis aims to develop a solver based on simplified formulae to rapidly assess cruise ship grounding damage. The seabed is represented by an elliptic paraboloid allowing to generate both sharp and shallow rocks varying two parameters. The ship is divided into large elements, called Super- Elements (S.E), representing the main bottom components. For each S.E, Ls-Dyna simulations are carried out. Based on these simulations, closed-form expressions are derived for the resistant force according to the Upper-Bound theorem of plasticity. Finally, the analytical expressions are validated by comparison with numerical results. In the second part of the thesis, the developments are implemented in a structural solver named FLAGS, which is coupled with the external dynamics solver MCOL to account for the action of the surrounding water. FLAGS/MCOL solver is validated by confrontation to Ls-Dyna/MCOL F.E. solutions for various full scale grounding accidents. Finally, the simplified tool is used to simulate thousands of grounding events with the aim of quantifying the influence of different reinforcements on the ship damage extent.
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Submitted on : Wednesday, November 23, 2022 - 5:41:17 PM
Last modification on : Friday, November 25, 2022 - 4:05:07 AM

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  • HAL Id : tel-03868392, version 1

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Jean-Philippe Pineau. Development of a fast and reliable solver based on simplified formulae for ship grounding analyses. Modeling and Simulation. École centrale de Nantes, 2022. English. ⟨NNT : 2022ECDN0028⟩. ⟨tel-03868392⟩

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