Simulations of helicopter ditching using smoothed particle hydrodynamics
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Simulations of helicopter ditching using smoothed particle hydrodynamics * G. Oger1, A. Vergnaud1, B. Bouscasse1, J. Ohana1, M. Abu Zarim1, M. De Leffe2, A. Bannier2, L. Chiron2, Y. Jus3, M. Garnier3, S. Halbout4, D. Le Touzé1 1. Ecole Centrale de Nantes, LHEEA Laboratory (ECN and CNRS), Nantes, France 2. Nextflow Software, Nantes, France 3. Bureau Veritas Solutions Marine and Offshore, Nantes, France 4. Airbus Helicopters, Marseille, France (Received May 30, 2020 Revised June 5, 2020, Accepted June 6, Published online August 10, 2020) ©China Ship Scientific Research Center 2020 Abstract: The present work has been performed in the context of the European H2020 project increased SAfety and Robust certification for ditching of Aircrafts and Helicopters (SARAH) dedicated to improving the safety during aircraft ditching, together with a better understanding of the physics involved during those crucial events. Both numerical and experimental aspects are explored during this project. The present study focuses on the application of the smoothed particle hydrodynamics (SPH) method to the simulation of helicopter ditching, as this method has proved to be particularly adapted to free surface impact cases. Simulations are performed for three different impact configurations, for which the numerical solutions are compared with the experimental results (forces and kinematics) obtained at the wave basin of Ecole Centrale Nantes on a mock-up shape provided by Airbus Helicopters. Elements of sensitivity analysis are also provided when needed, to assess the role of some parameters involved in the helicopter behavior and the fluid pressure forces exerted during the impact. Key words: Helicopter ditching, smoothed particle hydrodynamics (SPH), Free surface impact, wave impact, numerical vs experimental solutions
Introduction The European H2020 project SARAH aims at establishing novel holistic, simulation-based approaches to the analysis of ditching in order to increase the safety of aircrafts and helicopters in ditching/floatation situations with validations against dedicated experiments. A better understanding of the various phenomena occurring during such events and enhanced simulation tools are expected thanks to this project. To this aim, experiments were made in partnership with Airbus Helicopters[1], providing reference results for comparison with computational fluid dynamics (CFD) solvers. While both aircraft and helicopters cases are treated in this project, the present work focuses more specifically on the helicopter ditching. During such an event, and because of the high position of the center of gravity (engine and rotor), it is a challenge for the helicopter to avoid to capsize. In order to improve the chances of survival of
* Biography: G. Oger (1979-), Male, Ph. D. Research Fellow Corresponding author: G. Oger, E-mail: [email protected]
the occupants, an emergency floatation system (EFS) usually made of inflatable floats is deployed prior to the impact, keeping the helicopter afloat for a sufficiently long
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