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Pressure distribution due to stern tab deflection at model scale
Citation
Arnold, T and Lavroff, J and Davis, MR, Pressure distribution due to stern tab deflection at model scale, Royal Institution of Naval Architects. Transactions. Part A. International Journal of Maritime Engineering, 157, (A1) pp. A31-A40. ISSN 1479-8751 (2015) [Refereed Article]
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Copyright Statement
Copyright 2015 Royal Institution of Naval Architects
Official URL: http://www.rina.org.uk/IJME_303.html
DOI: doi:10.3940/rina.ijme.2015.a1.303
Abstract
Trim tabs form an important part of motion control systems on high-speed watercraft. By altering the pitch angle,
significant improvements in propulsion efficiency can be achieved by reducing overall resistance. For a ship in heavy
seas, trim tabs can also be used to reduce structural loads by changing the vessel orientation in response to encountered
waves. In this study, trials have been conducted in the University of Tasmania hydraulics laboratory using a closed circuit
water tunnel to measure model scale trim tab forces. The model scale system replicates the stern tabs on the full scale
INCAT Tasmania 112 m high-speed wave-piercer catamaran. The model was designed for total lift force
measurement and pressure tappings allowed for pressures to be measured at fixed locations on the underside of the hull
and tab. This investigation examines the pressures at various flow velocities and tab deflection angles for the case of
horizontal vessel trim. A simplified two-dimensional CFD model of the hull and tab has also been analysed using
ANSYS CFX software. The results of model tests and CFD indicate that the maximum pressure occurs in the vicinity
of the tab hinge and that the pressure distribution is long-tailed in the direction forward of the hinge. This accounts for
the location of the resultant lift force, which is found to act forward of the tab hinge.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | stern tab, pressure distribution, model scale |
| Research Division: | Engineering |
| Research Group: | Mechanical engineering |
| Research Field: | Mechanical engineering not elsewhere classified |
| Objective Division: | Transport |
| Objective Group: | Water transport |
| Objective Field: | Domestic passenger water transport (e.g. ferries) |
| UTAS Author: | Arnold, T (Mr Arnold) |
| UTAS Author: | Lavroff, J (Dr Jason Ali-Lavroff) |
| UTAS Author: | Davis, MR (Professor Michael Davis) |
| ID Code: | 96418 |
| Year Published: | 2015 |
| Web of Science® Times Cited: | 4 |
| Deposited By: | Engineering |
| Deposited On: | 2014-11-04 |
| Last Modified: | 2017-11-03 |
| Downloads: | 3 View Download Statistics |
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