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High porosity net drag at a low angle of attack in application to a representative prawn trawl


Balash, C and Bose, N and Binns, J and Sterling, D, High porosity net drag at a low angle of attack in application to a representative prawn trawl, Proceedings of the 31st International Conference on Ocean, Offshore and Arctic Engineering, 1-6 July 2012, Rio de Janeiro, Brazil, pp. 1-6. ISBN 978-0-7918-4494-6 (2012) [Refereed Conference Paper]

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Copyright 2012 ASME

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The presented work investigated the extent by which Reynolds number determines the drag coefficient for high porosity nets at a low angle of attack. A simple prawn trawl model that incorporates the main design features of prawn trawls employed in Australia was developed. Four trawl models of various high porosities were tested in a flume tank with respect to drag and shape over a range of flow velocities. The physical trawl model was analysed as a system of independent plane net sheets, each with an orientation to the flow estimated from analysis of stereo-vision data. The main finding was that the drag coefficient was weakly dependent on the Reynolds number in the range typical for prawn trawl operations, 1000<Re<1700. These combined findings imply that trawler operators can approximately estimate prawn net drag from a function containing trawl twine area, towing speed and spread ratio.

Item Details

Item Type:Refereed Conference Paper
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ocean engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Balash, C (Dr Cheslav Balash)
UTAS Author:Bose, N (Professor Neil Bose)
UTAS Author:Binns, J (Professor Jonathan Binns)
ID Code:79059
Year Published:2012
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2012-08-15
Last Modified:2014-09-01
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