Comparison of numerical approaches for structural response analysis of passenger ships in collisions and groundings

Kim, Sang Jin and Taimuri, Ghalib and Kujala, Pentti and Conti, Fabien and Le Sourne, Hervé and Pineau, Jean-Philippe and Looten, Thibaut and Bae, Hongseok and Mujeeb-Ahmed, M.P. and Vassalos, Dracos and Kaydihan, Levent and Hirdaris, Spyros (2022) Comparison of numerical approaches for structural response analysis of passenger ships in collisions and groundings. Marine Structures, 81. 103125. ISSN 0951-8339 (https://doi.org/10.1016/j.marstruc.2021.103125)

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Abstract

The dynamic response of ships following grounding and collision accidents may be influenced by structural topology as well as operational and environmental conditions. Traditionally, the consequences of such events may be assessed by crude empirical methods or laborious experiments. Computational methods offer a useful alternative in terms of accurately capturing crushing mechanisms also accounting the influence of surrounding water. This paper presents a benchmark study that compares the structural dynamic response by explicit nonlinear FEA approaches and the semi-numerical super-element method. Simulations for typical accident scenarios involving passenger ships confirm that implementing the influence of hydrodynamic restoring forces in way of contact may be useful for either collision or grounding. Yet, for grounding scenarios, the damaged area resulting from analytical simulations appears to be sensitive to the failure strain values adopted to model the rupture of the ship bottom floors.

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