DOI QR코드

DOI QR Code

CFD Application to Evaluation of Wave and Current Loads on Fixed Cylindrical Substructure for Ocean Wind Turbine

해상풍력발전용 고정식 원형 하부구조물에 작용하는 파랑 및 조류 하중 해석을 위한 CFD 기법의 적용

  • Park, Yeon-Seok (Dept. of Ocean Engineering, Mokpo National University) ;
  • Chen, Zheng-Shou (School of Naval Architecture and Civil Engineering, Zhejiang Ocean University) ;
  • Kim, Wu-Joan (Dept. of Ocean Engineering, Mokpo National University)
  • 박연석 (목포대학교 해양시스템공학과) ;
  • 진정수 (중국절강해양대학교 선박해양공학과) ;
  • 김우전 (목포대학교 해양시스템공학과)
  • Received : 2011.03.08
  • Accepted : 2011.04.22
  • Published : 2011.04.30

Abstract

Numerical simulations were performed for the evaluation of wave and current loads on a fixed cylindrical substructure model for an ocean wind turbine using the ANSYS-CFX package. The numerical wave tank was actualized by specifying the velocity at the inlet and applying momentum loss as a wave damper at the end of the wave tank. The Volume-Of-Fluid (VOF) scheme was adopted to capture the air-water interface. An accuracy validation of the numerical wave tank with a truncated vertical circular cylinder was accomplished by comparing the CFD results with Morison's formula, experimental results, and potential flow solutions using the higher-order boundary element method (HOBEM). A parametric study was carried out by alternately varying the length and amplitude of the wave. As a meaningful engineering application, in the present study, three kinds of conditions were considered, i.e., cases with current, waves, and a combination of current and progressive waves, passing through a cylindrical substructure model. It was found that the CFD results showed reasonable agreement with the results of the HOBEM and Morison's formula when only progressive waves were considered. However, when a current was included, CFD gave a smaller load than Morison's formula.

Keywords

Computational fluid dynamics;Morison's formula;High-order boundary element method;Numerical wave tank;Wave load;Current load;Circular cylinder;Ocean wind turbine;Substructure

References

  1. Boo, S.Y. (1995). "Weakly Nonlinear Diffraction Due to Vertical Cylinder in a 3-D Numerical Wave Tank", Proceedings of the Fifth International Offshore and Polar Engineering Conference, Hague, Netherlands, Vol 3, pp 19-25.
  2. Boo, S.Y. (2002). "Linear and Nonlinear Irregular Waves and Forces in a Numerical Wave Tank", Ocean Engineering, Vol 29, No 5, pp 475-493. https://doi.org/10.1016/S0029-8018(01)00055-5
  3. Choi, Y.R., Hong, S.Y. and Choi, H.S. (2001). "An Analysis of Second-order Wave Forces on Floating Bodies by using a Higher-order Boundary Element Method", Ocean Eng, Vol 13, No 5, pp 117-138.
  4. Dong, C.M. and Huang, C.J. (2001). "2-Dimensional Wave Tank in Viscous Fluid", Proceedings of the 11th International Offshore and Polar Engineering Conference, Stavanger, Norway.
  5. Guenter, C., Ike, L. and Ostergaard. (1988). Offshore Structures Engineering, Springer-Verlag Berlin Heideiberg.
  6. Hirt, C.W. and Nichols, B.D. (1981). "Volume of Fluid (VOF) Method for The Dynamics of Free Boundaries", Journal of Computational physics, Vol 39, No 201.
  7. Hong, S.Y., Kim, H.J. and Choi, Y.R. (2002). "Experimen-tal Study on Behavior of Tandem and Side-by-side Moored Vessels", Proceedings of 12th ISOPE, Kita-Kyushu 3, 841-847.
  8. Liu, Y.H., Kim, C.H. and Lu, X.S. (1990). "Comparison of Higher-order Boundary Element and Constant Panel Methods for Hydrodynamic Loadings", Journal of Offshore and Polar Engineering, ISOPE, Vol 1, No 1, pp 8-17.
  9. Park, J.C., Uno, Y., Matsuo, H. and Miyata, H. (2001). "Reproduction of Fully Nonlinear Multi-directional Waves by a 3-D Viscous Numerical Wave Tank", Proceedings of 11th International offshore and polar Engineering Conference, Stavanger, Norway.
  10. Sung, H.G., Kim, Y.S., Nam, B.W. and Hong, S.Y. (2007). "Experimental Investigation of Wave Loads on a Truncated Vertical Circular Cylinder", Proceedings of 2007 Fall Meeting of The Korean Society of Ocean Engineers.
  11. Weggel, D.C., Roesset, J.M. and Kim, M.H. (1996). "Second Order Vertical Diffraction Forces on Truncated Cylinders", Journal of Offshore Mechanics and Arctic Engineering 118, pp 259-266. https://doi.org/10.1115/1.2833914

Cited by

  1. Analysis on Interaction of Regular Waves and a Circular Column Structure vol.20, pp.2, 2017, https://doi.org/10.7846/JKOSMEE.2017.20.2.63