Parametric comparison of rectangular and circular pontoons performance as floating breakwater numerically

• Autorzy: Tabatabaei S. M. R. , Zeraatgar H.

Identyfikatory

DOI

10.2478/pomr-2018-0029

• Języki publikacji: EN

Abstrakty

EN

Rectangular and circular pontoons are one of the most widely cross-sections used as floating breakwaters (FB). Although, there are several articles on comparison of behavior of rectangular and circular floating breakwaters however, the Authors try to show some details of difference between these two types where they have not been addressed before. To do so, transmission coefficient (Ct), as a measure of merit, of similar rectangular and circular sections is numerically compared. A computer code is developed for two-dimensional hydrodynamic analysis of floating breakwater based on diffraction theory in frequency domain in regular waves with any configuration of mooring line. The numerical method is the finite element method and validated by comparing with experimental and numerical results. Three types of rectangular sections are defined equivalent to circular section and a numerical comparison is made between 100 similar sections. The Ct versus wave frequency has been considered in detail and three new points called LMinF, LMaxF and LMaxCt are introduced. It has been shown that LMinF and LMaxF of circular section are greater and LMaxCt is much smaller than equivalent rectangular section. The LMaxCt of both sections are very dependent to new nondimensional parameter B/D (Breadth/Draft). Although, rectangular sections are more common for floating breakwater, however the results of this study show that possibility of using circular sections must be also considered.

Słowa kluczowe

EN

Floating Breakwater; transmission coefficient; circular section; rectangular section

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: S 1
• Strony: 94--103
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Tabatabaei S. M. R.

• Amirkabir University of Technology Tehran Iran

autor

Zeraatgar H.

• Amirkabir University of Technology Tehran Iran

Bibliografia

• 1. Behzad, M. and Akbari, M., 2007.Experimental investigation on response and efficiency of moored ponton type floating breakwaters, Iranian Journal of Science & Technology, Transaction B, Engineering., 31: 95-99
• 2. Blumberg, G. P. and Cox, R. J., 1998.Floating breakwater physical model testing for marina applications, Bulletin of the Permanent International Association of Navigation Congresses., 63: 5-13
• 3. Dimer, N., Agnon, Y., and Stiassnie M., 1992.A simplified analytical model for a floating breakwater in water of finite depth, Applied Ocean Research., 14: 33-41.
• 4. Isaacson, M., Whiteside, N., Gardiner, R. and Hay, D., 1995.Modeling of a circular-section floating breakwater, Canadian Journal of Civil Engineering., 22:714-722
• 5. Ji, C. Y., Chen, X., Cui, J., Yuan, Z. M. and Incecik, A., 2015. Experimental study of a new type of floating breakwater., Waterway, Port, Coastal, Ocean Eng., 105: 295-303
• 6. Lee, J. and Cho, W., 2003.Hydrodynamic analysis of wave interactions with a moored floating breakwater using the element-free Galerkin method, Canadian Journal of Civil Engineering., 30(4):720–33.
• 7. Loukogeorgaki, E. and Angelides, D., 2005.Performance of Moored Floating Breakwaters, International Journal Of Offshore and Polar Engineering., 15: 264–273
• 8. Loukogeorgaki, E. and Angelides, D., 2005.Stiffness of mooring lines and performance of floating breakwater in three dimensions, Applied Ocean Research., 27: 187–208.
• 9. Mani, J. S., 1991.Design of Y-frame floating breakwater. Waterway, Port, Coastal, Ocean Eng., 117(2):105–118.
• 10. Mays, T. W., Plaut, R. H. and Liapis, S., 1998.Threedimensional analysis of submerged moored cylinders used as breakwaters, Waterway, Port, Coastal, Ocean Eng 1998., 26(12):1311-1333
• 11. McCartney, B. L., 1985.Floating breakwater design. Waterway, Port, Coastal, Ocean Eng., 111(2):304–318.
• 12. Ozeren, Y., Wren, D. G., Altinakar, M. and Work, P. A., 2011.Experimental Investigation of Cylindrical Floating Breakwater Performance with Various Mooring Configurations, Waterway, Port, Coastal, Ocean Eng., 137(6): 300–399.
• 13. Sannasiraj, S. A., Sundar, V., and Sundaravadivelu R., 1998. Mooring forces and motion responses of pontoon-type floating breakwaters, Waterway, Port, Coastal, Ocean Eng., 25(1): 27–48.
• 14. Sawaragi, T., 1995.Coastal Engineering Waves Beaches, Wave-Structure Interactions, Amsterdam: Elsevier
• 15. Shankar, S., 1998.Performance of twin-pontoon floating breakwaters, University of British Columbia

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).