Study about Vortex Shedding from a Pair of In-Line Forced Oscillating Parallel Arranged Circular Cylinders

Yokoi, Yoshifumi; Hirao, Kazuyuki

doi:10.1299/kikaib.77.590

Cited by 2 publications

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“…The author is observing that mix as the symmetrical vortex street discharged from two circular cylinders which are oscillating in the direction of a flow flows and goes down through study of a lock-in phenomenon until now, and rearrangement occurs as a vortex of another kind [2,3]. By using the lock-in phenomenon and phenomenon of vortical rearrangement, the author conjectured what can promote liquid stirring.…”

Section: Introductionmentioning

confidence: 99%

Numerical experiment about the arrangement determination of multiple bluff cylinders which obtain the most suitable new type stir

Yokoi

2016

EPJ Web of Conferences

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Abstract. When developing the stirring rod for mixing two liquid with which the densities into which gas melted differ in little stirring operation, verification of the stirring effect was performed in the numerical simulation using a vortex method. Since it is calculation for specification examination of the preceding paragraph which creates a producing model, it becomes important to obtain a calculation result early and to feed back to the design. Two dimension calculation of the double file circular cylinder group which carried out staggered arrangement of the nine circular cylinders was performed. The aspects of the flow which strayed off from the design point or the design point were shown. The mixed degree was judged from the degree of the complexity of the flow pattern. In a design point, the complicated flow by a vortex is formed with oscillating 1 period, and interference stirring occurs. Adaptation ranges other than a design point are that the ranges of the value of P/L are 0.8-1.2.

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Section: Introductionmentioning

confidence: 99%

Numerical experiment about the arrangement determination of multiple bluff cylinders which obtain the most suitable new type stir

Yokoi

2016

EPJ Web of Conferences

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Vortex flow around a pair of in-line forced oscillating tandem arranged circular cylinder

Yokoi

2014

Transactions of the JSME (In Japanese)

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In this study, the flow features of vortex shedding from a pair of tandem arranged circular cylinders oscillating along the direction of the flow were observed by visualizing water flow experiment at the ranges of the frequency ratio f/f K =0~6.2 (28 steps), the amplitude ratio 2a/d=0.25, 0.5, 0.75 and 1.0, the distance ratio L/d=1.5, 2.5 and 5.5 and Reynolds number Re=640. The variations of mean vortex shedding frequency were investigated. Although the cylinder oscillation frequency f is lower than the natural Karman vortex's frequency f K , the lock-in phenomenon can be seen even in tandem arrangement case. The lock-in ranges have been shown in each distance ratio L/d. It is found that the lock-in ranges become wide when comparing with the single cylinder case. The typical flow patterns of the lock-in or unlock in states were shown every distance ratio L/d. In distance ratios L/d=2.5 and 5.5, the twin vortex street from the 2nd cylinder (rear set cylinder) was not seen. The 2nd circular cylinder has more flow patterns than the 1st circular cylinder. The flow pattern of the 2nd circular cylinder was complicated, and various.

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Study about Vortex Shedding from a Pair of In-Line Forced Oscillating Parallel Arranged Circular Cylinders

Abstract: In this study, the flow features of vortex shedding from a pair of parallel arranged circular cylinders (same diameters and

Cited by 2 publications

References 8 publications

Numerical experiment about the arrangement determination of multiple bluff cylinders which obtain the most suitable new type stir

Numerical experiment about the arrangement determination of multiple bluff cylinders which obtain the most suitable new type stir

Vortex flow around a pair of in-line forced oscillating tandem arranged circular cylinder

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