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ITS » Proceeding » Fakultas Teknologi Kelautan
Posted by rudiwp@oe.its.ac.id at 23/09/2015 16:11:36  •  761 Views


EXPERIMENTAL STUDY ON TWO FLEXIBLE HANGING-OFF CIRCULAR CYLINDERS UNDERGOING WAKE INTERFERENCE

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




ABSTRAK

This paper presents experimental results of three different configurations of two flexible circular cylinders were towed in still water. Each cylinder has length-to-diameter ratio of 34.4 with low mass ratio of 1.24. The cylinders were submerged partially into the still water from towing carriage as hanging vertical cantilever and towed by various speeds that give Reynolds number of 1.08 104 up to 3.78 104. For side-by-side arrangement two distinct center-to-center distances between the two cylinders were considered while for the tandem arrangement the relative position of the cylinders is only 4D. For staggered arrangement a distance between upstream and downstream cylinders LUD was fixed by 4D and the position of the downstream cylinder in transverse direction LT was varied by 1D 1.5D 2D and 2.5D respectively. Measurement of the hydrodynamics forces in two in-line drag force and transverse lift force directions are conducted simultaneously with twocomponent load cells. For all test cases the characteristics of the time-dependent forces are strongly dictated by the reduced velocity Ur parameter. Frequency of the drag force was found approximately twice the corresponding lift force frequency at the related Ur. For all cases the CD and CL values lie in the range of approximately 0.03 up to 0.25. The tandem case became a very special case due to an extreme drop of the CD for the downstream cylinder compared with all other cases. In addition for staggered configuration the wake interference only has strong influence on the forces fluctuation until the LT 1D especially for the downstream cylinder.



Keywordshydrodynamics;velocity;fluctuation;cylinders
 
Subject:  Hidrodinamika
Date Create: 05/11/2015
Type: Text
Format: PDF
Language: English
Identifier: ITS-Proceeding-40114150000114
Collection ID: 40114150000114
Call Number: 532.5 Pra e


Source
Article of Proceedings

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ITS Community

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Article of Proceedings 2008 IEEE




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ITS-Proceeding-40114150000114-38963.pdf




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