Print Email Facebook Twitter Modelling strategies for numerical simulation of aircraft ditching Title Modelling strategies for numerical simulation of aircraft ditching Author Bisagni, C. (TU Delft Aerospace Structures & Computational Mechanics) Pigazzini, M. S. (University of California) Date 2017-05-01 Abstract Ditching, which is a controlled landing of an airplane on water, is an emergency condition to be investigated in order to improve the aircraft global crashworthiness. The complex hydrodynamic phenomena involved in ditching events are difficult to simulate and the accuracy of the results depends on the capability to reproduce the forces related to the interaction of the fuselage with the water surface. In the first part of the paper, the vertical impact on water of a rigid sphere is analysed using the explicit solver LS-DYNA in order to compare different modelling strategies. Four models of the fluid domain are presented: Lagrangian, arbitrary Lagrangian–Eulerian, smoothed particle hydrodynamics and hybrid Lagrangian-smoothed particle hydrodynamics. In the second part, the ditching of a scaled simplified airplane is simulated considering two different models for the water region. Experimental data from the literature are used to validate the simulations. The analysis, where the water and the air are modelled with the arbitrary Lagrangian–Eulerian method, shows a better correlation with the experimental data because this formulation can reproduce the suction force which acts on the fuselage and affects significantly the ditching dynamics. Subject ALEDitchingfluid-structure interactionhybrid Lagrangian-SPHwater impact To reference this document use: http://resolver.tudelft.nl/uuid:12e82f09-8ae7-4072-81dc-9357ad811aa2 DOI https://doi.org/10.1080/13588265.2017.1328957 ISSN 1358-8265 Source International Journal of Crashworthiness, 1-18 Part of collection Institutional Repository Document type journal article Rights © 2017 C. Bisagni, M. S. Pigazzini Files PDF Modelling_strategies_for_ ... tching.pdf 2.05 MB Close viewer /islandora/object/uuid:12e82f09-8ae7-4072-81dc-9357ad811aa2/datastream/OBJ/view