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1- Persian Gulf University
Abstract:   (357 Views)
In this study, the effect of hydrofoil stabilizer location on the porpoising instability of a mono-hull planing craft and also its optimal location have been investigated. The craft used in this project was a planing mono-hull one which was longitudinally unstable in the sea test. More precisely, it should be said that the craft entered the longitudinal instability stage at a speed of 30 knots and severe changes in its pitch and heave movements were observed. Numerical simulation which was based on computational fluid dynamics (CFD) techniques was done to simulate a three-dimensional geometric model in the fluid Eulerian two phases flow. A validation study was carried out by comparing the numerical results with the experimental data of the planing hull without the hydrofoil stabilizer. To study the effect of the installation position of the hydrofoil stabilizer, three parameters include depth of the hydrofoil relative to the transom bottom, the longitudinal distance of hydrofoil from the transom and the angle of attack were selected. The effects of changes in each of these parameters were investigated separately. Finally, the most suitable installation parameters that provide the best performance of the hydrofoil stabilizer and reduce the porpoising influence were selected. From the results of this study, it was observed that by increasing the depth of the hydrofoil from the transom and also by increasing the angle of attack of the hydrofoil, the amplitude of heave and pitch diagrams has decreased. The longitudinal distance of the hydrofoil to transom has not significant effect on porpoising instability. However, the results showed that the proper position for the hydrofoil stabilizer should not be under the hull bottom.
Full-Text [PDF 3728 kb]   (45 Downloads)    
Type of Study: Research Paper | Subject: Ship Hydrodynamic
Received: 2024/01/28 | Accepted: 2024/06/8

1. Savitsky, D., (1985), Planing craft. Naval Engineers Journal, Vol. 97, No.2. [DOI:10.1111/j.1559-3584.1985.tb03397.x]
2. Ikeda Y., (2000), Stability of high speed craft. In: Vassalos D, et al., editors. Con-temporary ideas on ship stability. New York: Elsevier Science Ltd.; 2000.p. 401-9. [DOI:10.1016/B978-008043652-4/50031-6] []
3. Faltinsen, O.M., (2005), Hydrodynamics of High-Speed Marine Vehicles; Cambridge University Press: Cambridge, UK. [DOI:10.1017/CBO9780511546068]
4. Celano, T., (1998), The Prediction of Porpoising Inception for Modern Planing Craft. SNAME Transactions 106, pp.269-292.
5. King D. W., Lockwood A. L., (1928). Anti-cavitation plate for outboard motors. United States Patent Office. Patent No.: 1,734,911. Nov. 5, 1929, Appl. No. 290,306.
6. Larson W., (1984). Boat stabilizer. United States Patent Office. Patent No.: 4,487,152., Appl. No. 482,401.
7. Day, J. P., Haag R. J., (1952). Planing Boat Porpoising-A Study of the Critical Boundries for a Series of Prismatic Hulls, Thesis submitted to Webb Institute of Naval Architecture, Glen Cove, Long Island, N.Y.
8. Savitsky, D., (1964), Hydrodynamic design of planing hulls. Mar. Technol. SNAME News 1964, 1, 71-95 [DOI:10.5957/mt1.1964.1.4.71]
9. Clement, E.P., Blount, D.L., (1963), Resistance tests of a systematic series of planing hull form, Trans. SNAME 71.
10. Brown, P., (1971), An experimental and theoretical study of planing surfaces with trim flaps, Davison Laboratory report 1463, Stevens institute of Technology, Hoboken, NJ, USA. [DOI:10.21236/AD0722393]
11. Savitsky D., Brown P., (1976). Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water, Marine Technology vol. 13, pp. 381-400. [DOI:10.5957/mt1.1976.13.4.381]
12. Blount, Doald L., Codega Louis T., (1992), Dynamic stability of planing boats. Marine Technology, Vol. 29, No. 1, pp. 4-12. [DOI:10.5957/mt1.1992.29.1.4]
13. Kazemi H., Salari M., (2017), Effects of loading conditions on hydrodynamics of a hard-chine planing vessel using CFD and a dynamic model, International Journal of Maritime Technology, ijmt2017;7:11-18. [DOI:10.18869/acadpub.ijmt.7.11]
14. Xiaosheng, B., Hailong, S., Jin, Z., Yumin, S., (2019). Numerical analysis of the influence of fixed hydrofoil installation position on seakeeping of the planing craft. Appl. Ocean Res. 2019, 90, 101863. [DOI:10.1016/j.apor.2019.101863]
15. Liru Zan, Hanbing Sun, Shijie Lu, Jin Zou, Lei Wan, (2022), Experimental Study on Porpoising of a High-speed Planing Trimaran. Journal of Marine Science Engineering, 11, 769. [DOI:10.3390/jmse11040769]
16. McCroskey, W. J., (1987), A Critical Assessment of Wind Tunnel Results for the NACA 0012 Airfoil. NASA Technical Memorandum.
17. Sport marine technologies Inc. Products. Available: https://sesport.wpengine.com
18. ITTC., (2014). Practical Guidelines for Ship CFD Applications. Recommended procedures and guidelines section: 7.5-03-02-03 2014b.

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International Journal of Maritime Technology is licensed under a

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