Journal of Advanced Research in Ocean Engineering

Korean Society of Ocean Engineers (한국해양공학회)
권호 표지
DOI QR코드

DOI QR Code

A Comparative Study on the Prediction of Bow Flare Slamming load using CFD and Prescript Formula for the Container Ship

  • Received : 2018.10.18
  • Accepted : 2018.12.20
  • Published : 2018.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

A ship repeatedly face free surface under rough sea conditions owing to relative motion with wave encounter. The impact pressure is transferred to the hull structure and causes structural damage. In this study, the bow flare slamming load of a container ship is estimated using computations fluid dynamics (CFD) and prescript formula according to various classifications. It is found that the bow flare slamming load calculated by the formulas of the common structural rule and ABS tends to be similar to the CFD results.

Keywords

E1GPC1_2018_v4n4_204_f0001.png 이미지

Fig. 1 Overset mesh system on the container ship

E1GPC1_2018_v4n4_204_f0002.png 이미지

Fig. 2 RAOs of the relative motion at the bow

E1GPC1_2018_v4n4_204_f0003.png 이미지

Fig. 3 Experiment on the 2D wedge (Kim et al., 2014)

E1GPC1_2018_v4n4_204_f0004.png 이미지

Fig. 4 Grid system for various numbers of cells

E1GPC1_2018_v4n4_204_f0005.png 이미지

Fig. 5 Comparison of the pressure history on various grid systems

E1GPC1_2018_v4n4_204_f0006.png 이미지

Fig. 6 Comparison of the pressure history on various delta times

E1GPC1_2018_v4n4_204_f0007.png 이미지

Fig. 7 Comparison of the wave height generated by the CFD and theory methods (Vs = 5 knots, H = 20.7 m, and T = 12.57 s)

E1GPC1_2018_v4n4_204_f0008.png 이미지

Fig. 9 Pressure measuring points of the numerical simulation

E1GPC1_2018_v4n4_204_f0009.png 이미지

Fig. 8 Time history of the heave and pitch motion on the KCS ship (Vs = 5 knots, H = 20.7 m and T = 12.57 s)

E1GPC1_2018_v4n4_204_f0010.png 이미지

Fig. 10 Pressure time history at specific points

E1GPC1_2018_v4n4_204_f0011.png 이미지

Fig. 11 Pressure time history at FP12

E1GPC1_2018_v4n4_204_f0012.png 이미지

Fig. 12 Pressure distributions and free surface

E1GPC1_2018_v4n4_204_f0013.png 이미지

Fig. 13 Comparison of the slamming pressure calculated using various formulas of the classifications

Table 1. Principal parameters of the container ship

E1GPC1_2018_v4n4_204_t0001.png 이미지

Table 2 Test conditions for numerical simulation

E1GPC1_2018_v4n4_204_t0002.png 이미지

Table 3 Test conditions of the various grid systems

E1GPC1_2018_v4n4_204_t0003.png 이미지

Table 4 Test conditions for various time steps (dt)

E1GPC1_2018_v4n4_204_t0004.png 이미지

Table 5 Categorization of the slamming formulas in the classification

E1GPC1_2018_v4n4_204_t0005.png 이미지

References

  1. Abdussamie, N., Amin, W., Ojeda, R., Thomas, G., and Drobyshevski, Y., 2014(a). Vertical Wave-in-Deck Loading and Pressure Distribution on Fixed Horizontal Decks of Offshore Platforms. The 24th International Offshore and Polar Engineering, Busan, South Korea.
  2. Abdussamie, N., Ojeda, R., Amin, W., Thomas, G., and Drobyshevski, Y., 2014(b). Prediction of Wave-in- Deck Loads on Offshore Structures Using CFD. The 19th Australasian Fluid Mechanics Conference, Melbourne, Australia, 8-11.
  3. ABS, 2016. Rules for building and classing Steel Vessels, Part 5C, Section 3.
  4. ABS, 2002. A Direct Calculation Approach for Designing a ship-shaped FPSO's Bow Against Wave Slamming Load, Technical Report.
  5. BV, 2017. Structure Rules for Container ships, Chapter 4, Section 5.
  6. Chen, C.R. and Chen, H.C., 2014. CFD simulation of Extreme Slamming on a Containership in Random Waves. The 24th International Ocean and Polar Engineering Conference, Korea.
  7. DNV-GL, 2016. Rule for Classificaion of Ships- Hull structural design Ships with length 100 meters and above, Part.3 Chapter 1, Section 7.
  8. Dobrovol'skaya, Z.N., 1969. On some problems of similarity flow of fluids with a free surface. Journal of Fluid Mechanics. 36, 805-829. https://doi.org/10.1017/S0022112069001996
  9. Hong, S.Y., Kyoung, J.H., Kim, Y.S., Song, K.-H., Kim, S., Malenica, S., Lindergren, M., Rathje, H., and Ge, C., 2008. Validation of wave loads on a large container ship in oblique waves. The 6th Osaka Colloquium on Seakeeping and stability of ships, Osaka, 109-117.
  10. Hong, S.Y., Kim, K.H., Kim, B.W., and Kim, Y.S., 2014. Experimental Study on the Bow-Flare Slamming of a 10,000 TEU Containership. Proc. the 24th Int. Ocean and Polar Engineering Conference, Busan, Korea.
  11. IACS, 2014. Common Structural Rules for Bulk Carriers and Oil Tankers, Part 1, Chapter 4, Section 5.
  12. Kim, K., Shin, Y.S., and Wang, W., 2008. A Stern Slamming Analysis Using Three-Dimensional CFD Simulation. The 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril Portugal.
  13. Kim, K.H., Lee, D.Y., Hong, S.Y., Kim, B.W., Kim, Y.S. and Nam, B.W., 2014. Experimental study on the water impact load on symmetric and asymmetric wedges, The 24th international Ocean and Polar Engineering Conference, 15-20 June, Busan, Korea, 2014, ISOPE-I-14-336.
  14. Lee, S. and Lew, J., 2015. Numerical Computations of Impact Forces Acting on Breakwater Plate of Bow Deck of Container Carrier. Journal of the Society of Naval Architects of Korea, 52(3), 198-205. https://doi.org/10.3744/SNAK.2015.52.3.198
  15. LR, 2017. Rules and Regulations for the classification of Naval Ships, Part 4, Chapter 2, Section 4.
  16. Muzaferija, S., Peric M.P., Sames, P., and Schellin, T., 1998. A Two Fluid Navier-Stokes Solver to Simulate WAter Entry, The 22nd Symposium on Naval Hydrodynamics, Washington D.C., USA, 638-651.
  17. NK, 2016. Rules for the Survey and Construction of Steel Ships, Part C, Chapter 6.
  18. Ock, Y.B., 2014. Numerical Simulations of Added Resistance around Ships in Regular Head Waves using Overset Grids, Master's thesis, Department of Naval Architecture and Ocean Engineering, Pusan National University.
  19. Peric, M. and Zorn, T.: Simulation of sloshing loads on moving tanks, 2005. 24th International Conference on Offshore Mechanics and Artic Engineering, 12-17 June, Halkidiki, Greece, 2005, OMAE2005-67581.
  20. Von Karman, T., 1929. The impact on sea plane floats during landing. National Advisory Committee for Aeronautics. Technical Note No 321, 309-313.
  21. Wagner, H., 1932. Uber Stossund Gleitvergange an der Oberflache von Flussigkeiten. Z. Angew. Mathematik and Mechanik. 12, 193-215. https://doi.org/10.1002/zamm.19320120402
  22. Wang, S. and Guedes Soares, C., 2012. Analysis of the water impact of symmetric wedges with a multimaterial eulerian formulation. International Journal of Maritime Engineering, 154 (A4), 191-206.
  23. Wang, S. and Guedes Soares, C., 2013. Slam induced loads on bow-flared sections with various roll angles. Ocean Engineering, 67, 45-57. https://doi.org/10.1016/j.oceaneng.2013.04.009
  24. Wang S. and Soares, C.G., 2016. Stern slamming of chemical tanker in irregular head waves, Ocean Engineering, 122, 322-332. https://doi.org/10.1016/j.oceaneng.2016.05.013
  25. Wang, R., Faltinsen, O.M., and Aarsnes, J.V., 1996. Water entry of arbitrary two-dimensional sections with and without flow separation, The 21st Symposium on Naval Hydrodynamics, 408-423.
  26. Zhao, R. and Faltisen, O., 1998. Water Entry of Arbitrary Axisymmetric Bodies With and Without Flow Separation. The 22nd Symposium on Naval Hydrodynamics, Washington D.C., USA, 652-664.