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High-speed water impacts of flat plates in different ditching configuration through a Riemann--ALE SPH m.del

Journal of Hydrodynamics 2018年第1期30卷 38-48页

作者： S.marrone A.Colagrossi L.Chiron m.de leffe D.Le Touzé CNR-INSEAN Marine Technology Research Institute Rome Italy NEXTFLOW Software Nantes France LHEEA Laboratory (UmR CNRS) Ecole Centrale de Nantes Nantes France

The violent water entry of flat plates is investigated using a Riemann-arbitrary Eulerian-Lagrangian（ALE） smoothed particle hydrodynamics（SPH） m.del. The test conditions are of interest for problems related to aircraft and helicopter emergency landing in water. Three main parameters are considered： the horizontal velocity, the approach angle（i.e., vertical to horizontal velocity ratio） and the pitch angle, a. Regarding the latter, small angles are considered in this study. As described in the theoretical work by Zhao and Faltinsen（1993）, for small a a very thin, high-speed jet of water is formed, and the time-spatial gradients of the pressure field are extremely high. These test conditions are very challenging for numerical solvers. In the present study an enhanced SPH m.del is firstly tested on a purely vertical impact with deadrise angle α=4°. An in-depth validation against analytical solutions and experimental results is carried out, highlighting the several critical aspects of the numerical m.delling of this kind of flow, especially when pressure peaks are to be captured. A discussion on the main difficulties when comparing to m.del scale experiments is also provided. Then, the more realistic case of a plate with both horizontal and vertical velocity components is discussed and compared to ditching experiments recently carried out at CNR-INSEAN. In the latter case both 2-D and 3-D simulations are considered and the importance of 3-D effects on the pressure peak is discussed for α=4° and α=10°.

关键词： Aircraft ditching high-speed water entry smoothed particle hydrodynamics(SPH)

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Simulations of helicopter ditching using smoothed particle hydrodynamics

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Journal of Hydrodynamics 2020年第4期32卷 653-663页

作者： G.Oger A.Vergnaud B.Bouscasse J.Ohana m.Abu Zarim m.de leffe A.Bannier L.Chiron Y.Jus m.Gamier S.Halbout D.Le Touze Ecole Centrale de Nantes LHEE4 Laboratory(ECN and CNRS)NantesFrance Nextflow Software NantesFrance Bureau Veritas Solutions marine and Offshore NantesFrance Airbus Helicopters MarseilleFrance

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 *** numerical and experimental aspects are explored during this *** 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 *** 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 *** 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.

关键词： Helicopter ditching smoothed particle hydrodynamics(SPH) Free surface impact wave impact numerical vs experimental solutions

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