International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Numerical simulation of air layer morphology on flat bottom plate with air cavity and evaluation of the drag reduction effect

  • Hao, W.U. (School of Transportation, Wuhan University of Technology) ;
  • Yongpeng, O.U. (Department of Naval Architecture, Naval University of Engineering)
  • Received : 2018.02.11
  • Accepted : 2018.09.19
  • Published : 2019.01.31
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Abstract

To investigate the morphology characteristics of air layer in the air cavity, a numerical method with the combination of RANS equations and VOF two-phase-flow model is proposed for a plate with air cavity. Based on the model above, the dynamic and developmental process of air layer in the air cavity is studied. Numerical results indicate that the air layer in the plate's air cavity exhibits the dynamic state of morphology and the wavelength of air layer becomes larger with the increasing speed. The morphology of air layer agrees with the Froude similarity law and the formation of the air layer is not affected by the parameters of the cavity, however, the wave pattern of the air layer is influenced by the parameters of the cavity. The stable air layer under the air cavity is important for the resistance reduction for the air layer drag reduction.

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References

  1. Ahmadzadehtalatapeh, M., Mousavi, M., 2016. A review on the drag reduction methods of the ship hulls for improving the hydrodynamic performance. Int. J. Marit. Technol. 4, 51-64.
  2. Ansys-FLUENT, 2017. User Guide FLUENT Version 17.0.
  3. Butterworth, J., Atlar, M., Weichao, S., 2015. Experimental analysis of an air cavity concept applied on a ship hull to improve the hull resistance. Ocean. Eng. 110, 2-10. https://doi.org/10.1016/j.oceaneng.2015.10.022
  4. Butuzov, A.A., 1967. Artificial cavitation flow behind a slender wedge on the lower surface of a horizontal wall. Fluid Dynam. 3, 83-87.
  5. Butuzov, A.A., 1994. Three-dimensional linearized problem of flow around a planning artificial cavity ship. In: Problem of Ship Hydrodynamics. Krylov SPI, St.Peterburg.
  6. Choi, J.K., Chahine, G.L., 2010. Numerical study on the behavior of air layers used for drag reduction. In: 28th Symposium on Naval Hydrodynamics Pasadena, California.
  7. Choi, J.K., Hsiao, C.T., Chahine, G.L., 2007. Numerical studies on the hydrodynamic performance and the startup stability of high speed ship hulls with air plenums and air tunnels. In: Ninth International Conference on Fast Sea Transportation FAST2007, Shanghai, China, pp. 476-484.
  8. Hao, W., 2017. Experimental Study and Numerical Analysis of Air Layer Drag Reduction on Large Displacement Ships. Naval University of Engineering.
  9. Kawakita, C., Takano, S., et al., 2011. Experimental investigation of the behavior of injected air on the ship bottom and its influence on propeller. J. Jpn. Soc. Nav. Archit. Ocean Eng. 12, 43-50.
  10. Kim, D., Moin, P., 2010. Direct numerical study of air layer drag reduction phenomenon over a backward facing step. In: Center for Turbulence Research Annual Research Briefs, pp. 351-363.
  11. Kumagai, I., Takahashi, Y., Murai, Y., 2015. Power-saving device for air bubble generation using a hydrofoil to reduce ship drag: theory, experiments, and application to ships. Ocean. Eng. 95, 183-194. https://doi.org/10.1016/j.oceaneng.2014.11.019
  12. Makiharju, S.A., Perlin, M., Ceccio, S.L., 2012. On the energy economics of air lubrication drag reduction. Int. J. Nav. Architect. Ocean Eng. 4, 412-422. https://doi.org/10.2478/IJNAOE-2013-0107
  13. Makiharju, S., Perlin, M., Ceccio, S.L., 2013. Time resolved X-ray densitometry for cavitating and ventilated partial cavities. Int. Shipbuild. Prog. (60), 471-494.
  14. Makiharju, S., Ceccio, S.L., et al., 2013. Time-resolved two-dimensional X-ray densitometry of a two-phase flow downstream of a ventilated cavity. Exp. Fluid 54 (7), 1561. https://doi.org/10.1007/s00348-013-1561-z
  15. Matveev, K.I., 2010. Transom effect on the properties of an air cavity under a flatbottom hull. Ships Offshore Struct. 7 (2), 143-149. https://doi.org/10.1080/17445302.2010.532602
  16. Matveev, K.I., 2015. Hydrodynamic modeling of semiplaning hulls with air cavities. Int. J. Nav. Architect. Ocean Eng. 7, 500-508. https://doi.org/10.1515/ijnaoe-2015-0036
  17. Murai, Y., 2014. Frictional drag reduction by bubble injection. Exp. Fluid 55 (7), 1773. https://doi.org/10.1007/s00348-014-1773-x
  18. Park, H.J., Oishi, Y., et al., 2016. Void waves propagating in the bubbly two-phase turbulent boundary layer beneath a flat-bottom model ship during drag reduction. Exp. Fluid 57 (12), 178. https://doi.org/10.1007/s00348-016-2268-8
  19. Slyozkin, A., Atlar, M., et al., 2014. An experimental investigation into the hydrodynamic drag reduction of a flat plate using air-fed cavities. Ocean. Eng. 76, 105-120. https://doi.org/10.1016/j.oceaneng.2013.10.013
  20. Stern, F., Wilson, R., Shao, J., 2006. Quantitative V&V of CFD simulations and certification of CFD codes. Int. J. Numer. Meth. Fluid. 50 (11), 1335-1355. https://doi.org/10.1002/fld.1090
  21. Wu, Hao, Dong, Wencai, Ou, Yong-peng, 2016. Numerical method investigation of drag reduction with air layer at bottom of ship. J. Nav. Univ. Eng. 28 (03), 70-75.
  22. Wu, Hao, Ou, Yong-peng, Dong, Wencai, 2016. Numerical study of method of flat plate viscous flow field with bubble. Ship Sci. Technol. 38 (15), 47-51.

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