Heave plates with holes for floating offshore wind turbines

• Autorzy: Ciba Ewelina , Dymarski Paweł , Grygorowicz Mirosław

Identyfikatory

DOI

10.2478/pomr-2022-0003

• Języki publikacji: EN

Abstrakty

EN

The paper presents an innovative solution which is heave plates with holes. The long-known heave plates are designed to damp the heave motion of platforms. They are most often used for Spar platforms. The growing interest in this type of platform as supporting structures for offshore wind turbines makes it necessary to look for new solutions. Based on the available literature and the authors’ own research, it was concluded that the main element responsible for the damping of heave plates is not so much the surface of the plate, but its edge. Therefore, it was decided to investigate the effect of the holes in heave plates on their damping coefficient. Model tests and CFD calculations were performed for three different structures: a smooth cylinder, a cylinder with heave plates with a diameter of 1.4 times the diameter of the cylinder, and a cylinder with the same plate, in which 24 holes were cut (Fig. 1). Free Decay Tests (FDT) were used to determine the damping coefficient and the natural period of heave, and then the values obtained were compared. The full and punched heave-plate designs were also tested with regular waves of different periods to obtain amplitude characteristics. The results obtained are not unequivocal, as a complex motion appears here; however, it is possible to clearly define the area in which the damping of a plate with holes is greater than that of a full plate.

Słowa kluczowe

EN

spar platforms; heave plates; damping coefficient; Floating Offshore Wind Turbines (FOWTs)

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2022
• Tom: nr 1
• Strony: 26--33
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Ciba Ewelina

• Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland

autor

Dymarski Paweł

• Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland

autor

Grygorowicz Mirosław

• Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland

Bibliografia

• 1. P. Dymarski, C. Dymarski, E. Ciba, (2019): “Stability Analysis of the Floating Offshore Wind Turbine Support Structure of Cell Spar Type during its Installation,” Polish Maritime Research, vol. 26, 4(104), 109-116.
• 2. H. A. Haslum, (2000): Simplified Methods Applied to Nonlinear Motion of Spar Platforms. Norwegian University of Science and Technology, Trondheim.
• 3. A. Subbulakshmi, R. Sundaravadivelu, (2016): “Heave damping of spar platform for offshore wind turbine with heave plate,” Ocean Engineering, vol. 121, pp. 24-36.
• 4. L. Tao, S. Cai, (2004): “Heave Motion Suppression of a Spar with a Heave Plate,” Ocean Engineering.
• 5. E. Ciba, (2021): “Heave Motion of a Vertical Cylinder with Heave Plates,” Polish Maritime Research, vol. 28, issue 1(109), pp. 42-47.
• 6. P.C. Mello, R.O.P Silva, E. Malta, L.H.S. Carno, (2019) Influence of heave plates on the dynamics of floating offshore wind turbine in waves, Conference Paper
• 7. L. Tao, D. Dray, (2008): “Hydrodynamic performance of solid and porous heave plates,” Ocean Engineering 35(10), doi:10.1016/j.oceaneng.2008.03.003[
• 8. A. Song, O.M. Faltinsen, (2013): “An experimental and numerical study of heave added mass and damping of horizontally submerged and perforated rectangular plates,” Journal of Fluids and Structures, vol. 39, pp. 87-101.
• 9. S. Holmes, P. Beynet, A. Sablock, I. Prislin, (2001): “Heave Plate Design with Computational Fluid Dynamics,” Journal of Offshore Mechanics and Arctic Engineering123(1).
• 10. L. Zhu, H.Ch. Lim, (2017): “Hydrodynamic characteristics of a separated heave plate mounted at a vertical circular cylinder,” Ocean Engineering, vol. 131, pp. 213-223.
• 11. H. Gu, P. Stansby, T. Stallard, E. C. Moreno, (2018): “Drag, added mass and radiation damping of oscillating vertical cylindrical bodies in heave and surge in still water,” Journal of Fluid and Structures, vol. 82, pp. 343-356.
• 12. B. Devolder, P. Troch, K. Rauwoens, (2019): “Accelerated numerical simulations of heaving floating body by coupling a motion solver with a two-phase fluid solver,” Computers &Mathematics with Applications77(6):1605-1625.
• 13. A.J. Dunbar, B.A. Craven, E. G. Paterson, (2015): “Development and validation of tightly coupled CFD/6- DOF solver for simulating floating offshore wind turbine platforms,” Ocean Engineering, vol. 110, pp. 98-105.
• 14. A. Maron, E. M. Fernandez, A. Valea, C. Lopez-Pavon, (2019): “Scale Effects on Heave Plates for Semi-Submersible Floating Offshore Wind Turbines: Case Study With a Solid Plain Plate,” Journal of Offshore Mechanics and Arctic Engineering142(3):1-14.
• 15. J. M. J. Journee, W. W. Massie, (2001): Offshore Hydromechanics. Delft University of Technology.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu „Społeczna odpowiedzialność nauki” - moduł: Popularyzacja nauki i promocja sportu (2022-2023).