Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Non-dimensional analysis of cylindrical objects freely dropped into water in two dimensions (2D)

  • Zhen, Yi (Natural Sciences Department, Southern University at New Orleans) ;
  • Yu, Xiaochuan (School of Naval Architecture and Marine Engineering, University of New Orleans) ;
  • Meng, Haozhan (Department of Electrical and Computer Engineering, University of New Orleans) ;
  • Li, Linxiong (Mathematics Department, University of New Orleans)
  • Received : 2020.06.11
  • Accepted : 2020.09.02
  • Published : 2020.09.25
⟨ Previous Next ⟩

Abstract

The dropped objects are identified as one of the top ten causes of fatalities and serious injuries in the oil and gas industry. It is of importance to understand dynamics of dropped objects under water to accurately predict the motion of dropped objects and protect the underwater structures and facilities from being damaged. In this paper, we study non-dimensionalization of two-dimensional (2D) theory for dropped cylindrical objects. Non-dimensionalization helps to reduce the number of free parameters, identify the relative size of effects of force and moments, and gain a deeper insight of the essential nature of dynamics of dropped cylindrical objects under water. The resulting simulations of dimensionless trajectory confirms that drop angle, trailing edge and drag coefficient have the significant effects on dynamics of trajectories and landing location of dropped cylindrical objects under water.

Keywords

References

  1. Aanesland, V. (1987), Numerical and experimental investigation of accidentally falling drilling pipes. In: 19th Annual OTC in Houston, TX, USA.
  2. ABS (American Bureau of Shipping) (2013), Guidance notes on accidental load analysis and design for offshore structures. Houston: ABS.
  3. ABS (American Bureau of Shipping) (2017), Guide for dropped object prevention on offshore units and installations. Houston: ABS.
  4. Awotahegn, M.B. (2015), Experimental Investigation of Accidental Drops of Drill Pipes and Containers (Master Thesis), University of Stavanger.
  5. Bergmann, M. and Iollo, A. (2011), "Modeling and simulation of fish-like swimming", J. Comput. Phys., 230, 329-348 https://doi.org/10.1016/j.jcp.2010.09.017
  6. Colwill, R.D. and Ahilan,R.V. (1992), Reliability analysis of the behavior of dropped objects. In: 24th Annual OTC in Houston, TX, USA
  7. Chu, P.C., Gilles, A. and Fan, C.W. (2005), "Experiment of falling cylinder through the water column", Exp. Therm. Fluid Sci., 29, 555-568. https://doi.org/10.1016/j.expthermflusci.2004.08.001
  8. Chu, P.C. and Fan, C.W. (2006), "Prediction of falling cylinder through air-water-sediment columns", ASME J. Appl. Mech. Rev., 73, 300-314. https://doi.org/10.1115/1.2125975
  9. DNV (Det Norske Veritas) (2010), DNV recommended practice: Risk assessment of pipeline protection. DNVRP-F107. Oslo, Norway: DNV.
  10. Dropped Objects Register of Incidents & Statistics (DORIS) (2016), (accessed 16.03.15)
  11. Gudmestad, O.T. and Moe, G. (1996), "Hydrodynamic coefficients for calculation of hydrodynamic loads on offshore truss structure", Mar. Struct., 9(8), 745-758. https://doi.org/10.1016/0951-8339(95)00023-2
  12. Hoerner, S.F. (1958), Fluid Dynamics Drag, Bricktown, NJ. USA.
  13. Kim, Y.H., Liu, Y.M. and Yue, D.K.P. (2002), Motion dynamics of three-dimensional bodies falling through water. In: 17th IWWWFB, 21-081.
  14. Luo, Y. and Davis, J. (1992), Motion simulation and hazard assessment of dropped objects, In: Proceedings of the Second International Offshore and Polar Engineering Conference, ISBN 1-880653-04-4(Vol IV), San Francisco, USA
  15. Majed, A. and Cooper, P. (2013), "High Fidelity Sink Trajectory Nonlinear Simulations for Dropped Subsea Objects", Proceedings of the 23rd Int Offshore Polar Eng. Conf, Anchorage, AK, USA, ISOPE,2,18-26.
  16. Newman, J.N. (1977), Marine Hydrodynamic, The MIT Press, Cambridge, Massachusetts, USA.
  17. Schlichting, H. (1979), Boundary Layer Theory. McGraw-Hill Book Company, New York, USA.
  18. Xiang, G., Birk, L., Li, L., Yu, X. and Luo, Y. (2016), "Risk free zone study for cylindrical objects dropped into the water", J. Ocean Syst. Eng., 6(4), 377-400. https://doi.org/10.12989/ose.2016.6.4.377
  19. Xiang, G., Birk, L., Yu, X. and Li, X. (2017a), "Study of the trajectory and landing points of dropped cylindrical object with different longitudinal center of gravity", Int. Soc. Offshore Polar Engineers, 27(3), 274-282. https://doi.org/10.17736/ijope.2017.sh17
  20. Xiang, G., Birk, L., Yu, X. and Lu, H., (2017b), "Numerical study on the trajectory of dropped cylindrical objects", J. Ocean Eng., 130, 1-9. https://doi.org/10.1016/j.oceaneng.2016.11.060
  21. Yasseri, S. (2014), "Experimental of free-falling cylinders in water", Underwater Technol., 32(2), 177-191. https://doi.org/10.3723/ut.32.177
  22. Yu, X., Li, L., Xiong, Z. and Kang, S. (2020a), "Hit probability of cylindrical objects dropped on pipelines in offshore operations", J. Pipeline Systems - Engineering and Practice, 11(4), 04020048. https://doi.org/10.1061/(ASCE)PS.1949-1204.0000494
  23. Yu, X., Xiang, G., Collopy, H. and Kong, X. (2020b), "Trajectory tracking of a model rocket falling into the towing tank: Experimental tests versus numerical simulations", J. Aerosp. Eng., 33(5), 04020056. https://doi.org/10.1061/(ASCE)AS.1943-5525.0001172