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

查看全文 作　　者：[1]S.Marrone;[1]A.Colagrossi;[2]L.Chiron;M.De [2]Leffe;D.Le [3]Touzé

机构地区：[1]CNR-INSEAN, Marine Technology Research Institute, Rome, Italy;[2]NEXTFLOW Software, Nantes, France;[3]LHEEA Laboratory (UMR CNRS), Ecole Centrale de Nantes, Nantes, France

出　　处：《Journal of Hydrodynamics》索引2018年第30卷第1期,共11页

基　　金：partially received funding from the European Union's Horizon 2020 Research and Innovation Programme (Grant No. 724139) 摘　　要：The violent water entry of flat plates is investigated using a Riemann-arbitrary Eulerian-Lagrangian(ALE) smoothed particle hydrodynamics(SPH) model. 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 model 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 modelling of this kind of flow, especially when pressure peaks are to be captured. A discussion on the main difficulties when comparing to model 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：RIEMANN 水动力学测试条件水平速度直升飞机实验建模淡色啤酒紧急情况

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

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