Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Experimental and Numerical Study on the Characteristics of Free Surface Waves by the Movement of a Circular Cylinder-Shaped Submerged Body in a Single Fluid Layer

  • Jun-Beom Kim (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Eun-Hong Min (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Weoncheol Koo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • Received : 2023.04.12
  • Accepted : 2023.05.23
  • Published : 2023.06.30
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Abstract

Analyzing the interactions of free surface waves caused by a submerged-body movement is important as a fundamental study of submerged-body motion. In this study, a two-dimensional mini-towing tank was used to tow an underwater body for analyzing the generation and propagation characteristics of free surface waves. The magnitude of the maximum wave height generated by the underwater body motion increased with the body velocity at shallow submerged depths but did not increase further when the generated wave steepness corresponded to a breaking wave condition. Long-period waves were generated in the forward direction as the body moved initially, and then short-period waves were measured when the body moved at a constant velocity. In numerical simulations based on potential flow, the fluid pressure changes caused by the submerged-body motion were implemented, and the maximum wave height was accurately predicted; however, the complex physical phenomena caused by fluid viscosity and wave breaking in the downstream direction were difficult to implement. This research provides a fundamental understanding of the changes in the free surface caused by a moving underwater body.

Keywords

Acknowledgement

This research was supported by the Basic Research Project of Science and Engineering, National Research Foundation of Korea (NRF-2018R1D1A1B07040677).

References

  1. Dean, W.R. (1948). On the reflection of surface waves by a submerged circular cylinder. Mathematical Proceedings of the Cambridge Philosophical Society, 44(4), 483-491. https://doi.org/10.1017/S0305004100024506
  2. Holloway, D. S., & Davis, M. R. (2002). Green function solutions for the transient motion of water sections. Journal of Ship Research, 46(2), 99-120. https://doi.org/10.5957/jsr.2002.46.2.99
  3. Hyun, B. S., & Shin, Y. H. (2000). On the viscous flow around breaking waves generated by a submerged cylinder (Part 2: Aspects of viscous flow). Journal of the Society of Naval Architects of Korea, 37(1), 91-98.
  4. Jeon, M. J., Mai, T. L., Yoon, H. K., Ryu, J. W., Lee, W. H., & Ku, P. M. (2021). Evaluation of dynamic characteristics for a submerged body with large angle of attack motion via CFD analysis. Journal of Ocean Engineering and Technology, 35(5), 313-326. https://doi.org/10.26748/KSOE.2021.063
  5. Journee, J. M. J., & Massie, W. W. (2001). Offshore hydromechanics (1st ed). Delft University of Technology.
  6. Kim, D. E., Min, E. H., Koo, W. C., & Kim, Y. G. (2019). Numerical analysis of free surface by motion of a submerged body in fluids. Proceedings of KOASTS 2019, 90-93.
  7. Kim, J. B., Koo, W. C., & Min, E. H. (2022a). An experimental study of towing a circular submerged body in a single-layer fluid. Proceedings of KOASTS 2022, 264-265.
  8. Kim, J. B., Koo, W. C., & Min, E. H. (2022b). Comparison of numerical simulation and experiment of a towed submerged cylinder in a single fluid. Proceeding of the Annual Autumn Conference 2022, SNAK, 418-422.
  9. Liu, T. L., & Guo, Z. M. (2013). Analysis of wave spectrum for submerged bodies moving near the free surface. Ocean Engineering, 58, 239-251. https://doi.org/10.1016/j.oceaneng.2012.10.003
  10. Min, E. H., & Koo, W. C. (2017). Hydrodynamic characteristics of internal waves induced by a heaving body in a two-layer fluid. Ocean Engineering, 145(15), 290-303. https://doi.org/10.1016/j.oceaneng.2017.09.017
  11. Min, E. H., & Koo, W. C. (2022). Comparison of wave diffraction forces on a surface-piercing body for various free-surface grid update schemes. Ocean Engineering, 259(1), 111912. https://doi.org/10.1016/j.oceaneng.2022.111912
  12. Mnasri, C., Hafsia, Z., Omri, M., & Maalel, K. (2014). A moving grid model for Simulation of free surface behavior induced by horizontal cylinders exit and entry. Engineering Applications of Computational Fluid Mechanics, 4(2), 260-275. https://doi.org/10.1080/19942060.2010.11015315
  13. Ren, Y., Qin, Y., Pang, F., Wang, H., Su, Y., & Li, H. (2023). Investigation on the flow-induced structure noise of a submerged cone-cylinder-hemisphere combined shell. Ocean Engineering, 270, 113657. https://doi.org/10.1016/j.oceaneng.2023.113657
  14. Scullen, D., & Tuck, E. O. (1995). Nonlinear free-surface flow computations for submerged cylinders. Journal of Ship Research, 39(3), 185-193. http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=3668054
  15. Seong, W. J., Koo, W. C., & Min, E. H. (2022). Numerical and experimental study on free-surface wave generation by a submerged moving body in a towing tank. Ocean Engineering, 252(15), 1-12. https://doi.org/10.1016/j.oceaneng.2022.111200
  16. Sheridan, J., Lin, J. C., & Rockwell, D. (1997). Flow past a cylinder close to a free surface. Journal of Fluid Mechanics, 330(10), 1-30. https://doi.org/10.1017/S002211209600328X
  17. Shin, D. M., & Cho, Y. (2021). Concurrent vortex-shedding and surface-wave phenomena around a horizontal circular cylinder close to a free surface. Proceeding of KSME Conference, 33-35.
  18. Ursell, F. (1950). Surface waves on deep water in the presence of a submerged circular cylinder. I. Mathematical Proceedings of the Cambridge Philosophical Society, 46(1), 141-152. https://doi.org/10.1017/S0305004100025561.
  19. Uzair, A. S., & Koo, W. C. (2012). Hydrodynamics analysis of a floating body with an open chamber using a 2D fully nonlinear numerical wave tank. International Journal of Naval Architecture and Ocean Engineering, 4(3), 281-290. https://doi.org/10.2478/IJNAOE-2013-0096.
  20. Yi, H. J., Shin, H. K., & Yoon, B. S. (2013). Study on flow around circular cylinder advancing beneath free surface. Journal of Ocean Engineering and Technology, 27(5), 16-21. http://dx.doi.org/10.5574/KSOE.2013.27.5.016.