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Pressure distribution due to stern tab deflection at model scale


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 2015 Royal Institution of Naval Architects

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DOI: doi:10.3940/rina.ijme.2015.a1.303


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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