Advertisement

Journal of Hydrodynamics

, Volume 30, Issue 1, pp 38–48 | Cite as

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

  • S. Marrone
  • A. Colagrossi
  • L. Chiron
  • M. De Leffe
  • D. Le Touzé
Special Column on SPHERIC2017 (Guest Editors Mou-bin Liu, Can Huang, A-man Zhang)
  • 81 Downloads

Abstract

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, α. Regarding the latter, small angles are considered in this study. As described in the theoretical work by Zhao and Faltinsen (1993), for small α 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°.

Keywords

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

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

Acknowledgements

The research leading to these results has partially received funding f r om the European Union's Horizon 2020 Research and Innovation Programme (Grant No. 724139). The SPH simulations performed under the present research have been obtained using the SPHFlow solver, software developed within a collaborative consortium composed of Ecole Centrale de Nantes, Next Flow Software company and CNR-INSEAN.

References

  1. [1]
    Streckwall H., Lindenau O., Bensch L. Aircraft ditching: A free surface/free motion problem [J]. Archives of Civil and Mechanical Engineering, 2007, 7(3): 177–190.CrossRefGoogle Scholar
  2. [2]
    Guo B., Liu P., Qu Q. et al. Effect of pitch angle on initialstage of a transport airplane ditching [J]. Chinese Journal of Aeronautics, 2013, 26(1): 17–26.CrossRefGoogle Scholar
  3. [3]
    Oger G., Doring M., Alessandrini B. et al. Two-dimensional SPH simulations of wedge water entries [J]. Journal of Computational Physics, 2006, 213(2): 803–822.MathSciNetCrossRefMATHGoogle Scholar
  4. [4]
    Meringolo D. D., Colagrossi A., Marrone S. et al. On the filtering of acoustic components in weakly-compressible SPH simulations [J]. Journal of Fluids and Structures, 2017, 70: 1–23.CrossRefGoogle Scholar
  5. [5]
    Lind S., Stansby P., Rogers B. D. In compressible-compressible flows with a transient discontinuous interface using smoothed particle hydrodynamics (SPH) [J]. Journal of Computational Physics, 2016, 309: 129–147.MathSciNetCrossRefMATHGoogle Scholar
  6. [6]
    Marrone S., Colagrossi A., Di Mascio A. et al. Prediction of energy losses in water impacts using incompressible and weakly compressible models [J]. Journal of Fluids and Structures, 2015, 54: 802–822.CrossRefGoogle Scholar
  7. [7]
    Oger G., Marrone S., Le Touzé D. et al. SPH accuracy improvement through the combination of a quasi-Lagrangian shifting transport velocity and consistent ALE formalisms [J]. Journal of Computational Physics, 2016, 313: 76–98.MathSciNetCrossRefMATHGoogle Scholar
  8. [8]
    Vila J. On particle weighted methods and smooth particle hydrodynamics [J]. Mathematical Models and Methods in Applied Sciences, 1999, 9(2): 161–209.MathSciNetCrossRefMATHGoogle Scholar
  9. [9]
    Marrone S., Colagrossi A., Park J. et al. Challenges on the numerical prediction of slamming loads on LNG tank insulation panels [J]. Ocean Engineering, 2017, 141: 512–530.CrossRefGoogle Scholar
  10. [10]
    Zhao R., Faltinsen O. M. Water entry of two-dimensional bodies [J]. Journal of Fluid Mechanics, 1993, 246: 593–612.CrossRefMATHGoogle Scholar
  11. [11]
    Korobkin A. A., Iafrati A. Numerical study of jet flow generated by impact on weakly compressible liquid [J]. Physics of Fluids, 2006, 18(3): 032108.MathSciNetCrossRefMATHGoogle Scholar
  12. [12]
    Campana E., Carcaterra A., Ciappi E. et al. Some insights into slamming forces: compressible and incompressible phases [J]. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2000, 214(6): 881–888.Google Scholar
  13. [13]
    Korobkin A., Pukhnachov V. Initial stage of water impact [J]. Annual Review of Fluid Mechanics, 1988, 20: 159–185.CrossRefGoogle Scholar
  14. [14]
    Faltinsen O. M., Semenov Y. A. Nonlinear problem of flat-plate entry into an incompressible liquid [J]. Journal of Fluid Mechanics, 2008, 611: 151–173.MathSciNetCrossRefMATHGoogle Scholar
  15. [15]
    Okada S., Sumi Y. On the water impact and elastic response of a flatplate at small impact angles [J]. Journal of Marine Science and Technology, 2000, 5(1): 31–39.CrossRefGoogle Scholar
  16. [16]
    Chuang S. L. Experiments on slamming of wedge-shaped bodies [J]. Journal of Ship Research, 1967, 11(3): 190–198.Google Scholar
  17. [17]
    Mizoguchi S., Tanizawa K. Impact wave loads due to slamming-A review [J]. Ship Technology Research, 1996, 43(4): 139–154.Google Scholar
  18. [18]
    Tenzer M., Moctar O. E., Schellin T. E. Experimental investigation of impact loads during water entry [J]. Ship Technology Research, 2015, 62(1): 47–59.CrossRefGoogle Scholar
  19. [19]
    Iafrati A. Experimental investigation of the water entry of a rectangular plate at high horizontal velocity [J]. Journal of Fluid Mechanics, 2016, 799: 637–672.CrossRefGoogle Scholar
  20. [20]
    Armand J., Cointe R. Hydrodynamic impact analysis of a cylinder [J]. Journal of Offshore Mechanics and Arctic Engineering, 1987, 109(3): 237–243.CrossRefGoogle Scholar
  21. [21]
    Watanabe T. Analytical expression of hydrodynamic impact pressureby matched asymptotic expansion technique [J]. Transation of the West-Japan Society of Naval Architects, 1986, 71: 77–85.Google Scholar
  22. [22]
    Semenov Y. A., Iafrati A. On the nonlinear water entry problem of asymmetric wedges [J]. Journal of Fluid Mechanics, 2006, 547: 231–256.MathSciNetCrossRefMATHGoogle Scholar
  23. [23]
    Iafrati A., Grizzi S., Siemann M. et al. High-speedditching of a flat plate: Experimental data and uncertainty assessment [J]. Journal of Fluids and Structures, 2015, 55: 501–525.CrossRefGoogle Scholar
  24. [24]
    Chiron L., Oger G., de Leffe M. et al. Analysis and improvements of adaptive particle refinement (APR) through CPU time, accuracy and robustness considerations [J]. Journal of Computational Physics, 2018, 354: 552–575.MathSciNetCrossRefMATHGoogle Scholar

Copyright information

© China Ship Scientific Research Center 2018

Authors and Affiliations

  • S. Marrone
    • 1
  • A. Colagrossi
    • 1
  • L. Chiron
    • 2
  • M. De Leffe
    • 2
  • D. Le Touzé
    • 3
  1. 1.CNR-INSEAN, Marine Technology Research InstituteRomeItaly
  2. 2.NEXTFLOWSoftwareNantesFrance
  3. 3.LHEEA Laboratory (UMR CNRS)Ecole Centrale de NantesNantesFrance

Personalised recommendations