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ITS » Proceeding » Fakultas Teknologi Kelautan
Posted by rudiwp@oe.its.ac.id at 23/09/2015 16:17:13  •  785 Views


DYNAMICS OF TWO FLEXIBLE HANGING-OFF CIRCULAR CYLINDERS IN STAGGERED CONFIGURATIONS

Author :
PRASTIANTO ,RUDI WALUJO ( 1971 0508 1997 03 1001 )
KOJI OTSUKA   YOSHIHO IKEDA




ABSTRAK

motions experienced by two flexible circular cylinders in staggered arrays which are towed in still water. The cylinders were submerged partially into the still water from a towing carriage as hanging-off vertical cantilevers. Each cylinder has length-to-diameter ratio of 34.4 with low mass ratio 1.24. The Reynolds number varied from 27000 up to 37800. For examining wake interference effects on the forces and motion of the cylinders in the staggered configuration a centre to centre longitudinal gap between the upstream and downstream cylinders was fixed by 4D with transverse gaps were varied by 1D 1.5D 2D 2.5D 3.5D and 4.5D respectively. Measurement of the hydrodynamics forces and motions in two in-line and transverse directions to the flows were performed simultaneously. Frequency of the drag force was found approximately twice the corresponding lift force frequency at the related reduced velocity Ur for all cases and the forces frequencies ratio was independent from the Ur and LT parameters in the range used. For the upstream cylinder



Keywordshanging-off flexible cylinders; drag and lift coefficients; upstream and downstream cylinders; wake interference; motion trajectories.
 
Subject:  Hidrodinamika
Date Create: 09/11/2015
Type: Text
Format: PDF
Language: English
Identifier: ITS-Proceeding-40114150000115
Collection ID: 40114150000115
Call Number: 532.5 Pra d


Source
Article of Proceedings

Coverage
ITS Community

Rights
Proceedings of the Eighth (2008) ISOPE Pacific/Asia Offshore Mechanics Symposium Bangkok, Thailand, November 10-14, 2008 Copyright 2008 by The International Society of Offshore and Polar Engineers ISBN 978-1-880653-52-4




[ Download - Summary ]

ITS-Proceeding-40114150000115-38965.pdf




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