Flow-induced Oscillations Of A Circular Cylinder Due To Interference Effects

Gowda, B. H. Lakshmana; Sreedharan, Vikram

doi:10.1006/jsvi.1994.1392

Cited by 14 publications

(16 citation statements)

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“…In all the cases considered, the interfering cylinder was never upstream of the test cylinder. In an attempt to bring out the influence of geometry, in some of the cases, the results are compared with those of circular geometry (Sreedharan, 1992;Gowda and Sreedharan, 1994). The response of the test cylinder was obtained for different ratios of interfering cylinder side dimension b to the test cylinder side dimension B: i.e., b=B ¼ 0:5, 1.0, 1.5 and 2.0 (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced vibration of a square cylinder without and with interference

Kumar

Gowda

2006

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 99%

Flow-induced vibration of a square cylinder without and with interference

Kumar

Gowda

2006

Journal of Fluids and Structures

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“…Literature confirms this possibility. At a free stream turbulence intensity of less than 1% and at low damping conditions, Gowda and Sreedharan [43] report a peak-topeak amplitude value equal to 13% of the diameter of the cylinder at a reduced velocity value of 5.3 (present case value for circular cylinder). It is interesting that under closely similar conditions, a square cylinder was found to exhibit a higher peak-to-peak amplitude value equal to 16% of the cylinder side dimension [44].…”

Section: Mode and Mechanism Of Shedding At R/b=05mentioning

confidence: 93%

Influence of corner radius on the near wake structure of a transversely oscillating square cylinder

Kumar

Sohn

Gowda³

2009

J Mech Sci Technol

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The near wake flow field features of transversely oscillating square section cylinders with different corner radii were studied in an attempt to assess the influence of corner radius. The investigation was performed by using particle image velocimetry (PIV) technique in a water channel with a turbulence intensity of 6.5%. Five models were studied with r/B=0, 0.1, 0.2, 0.3 and 0.5 (r is the corner radius and B is the characteristic dimension of the body), and the body oscillation was limited to lock-in condition (at fe/fo=1.0; fe is the excitation frequency and fo is the vortex shedding frequency from a stationary cylinder at the same Re). The corner radius was found to significantly influence the flow features around the bodies. Except for r/B=0.5, for all the other cases of r/B ratios, cycle-to cycle variation in the mode of vortex shedding was observed in the case of oscillating cylinders inducing highly non-linear wake characteristics. Apart from variation in the shedding mode, changes in shedding cycle timing were also observed for sharp and rounded square cylinders. The hgher the r/B ratio, shedding in the near wake was found to be more uniform (lesser variation in shedding cycle timings). Another admissible shedding mechanism is newly identified to operate in the near wake of oscillating cylinders now being called as the 'passive shedding' mechanism. Results indicate that increasing the corner radius suppresses the possible instabilities of the cylinder.

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“…The arrangement is essentially the same as that used by Gowda and Sreedharan [17]. The experimental model features are the same as those described in G&A.…”

Section: Experimental Set Upmentioning

confidence: 96%

“…This is found to be somewhat similar to the response characteristics reported at position A1 [11] wherein amplitude once triggered is not returning to lower levels as the reduced velocity is increased (for b/B>1.0). The response observed at A13 for b/B 1.0 is typically of vortex-induced vibration (self-limiting characteristic) and for b/B>1.0, quite possibly, the excitation mechanism is due to 'proximity-induced galloping' (Bokain and Geoola [19]; Gowda and Sreedharan [17]). To highlight further, composed with the response of the single cylinder case, considerable interference effects could be observed for the cases with b/B>1.0 wherein they do not exhibit a finite resonance range, unlike the cases with b/B 1.0.…”

Section: Interference Effects; Influence Of B/b Ratio (Vibratory Resumentioning

confidence: 99%

“…Zdravkovich [16] and Gowda and Sreedharan [17] have given extensive results for the interference effects on a circular cylinder. Kumar and Gowda [18] and Gowda and Kumar [11] (hereafter referred to as G&A) have studied the interference excitation of a square section cylinder and have reported the vibratory response characteristics of a square cylinder (test cylinder) due to interference effects from another square placed in its vicinity (interfering cylinder).…”

Section: Introductionmentioning

confidence: 99%

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Interference excitation of a square section cylinder

2008

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Wind tunnel experiments were conducted to study the interference excitation of a square section cylinder (test cylinder) and the results are reported in this paper. The study was carried out at some specific relative positions identified between the test cylinder (side dimension B) and the interfering cylinder (side dimension b) so that the latter is never upstream of the former. Experiments were carried out for the b/B ratios of 0.5, 1.0, 1.5 & 2.0. In this paper, emphasis is laid on bringing out the influence of b/B ratio on the vibratory response of the test cylinder, considering a few interference positions. The results show that at a particular relative position, the magnitude of vibrations and the response trend of the test cylinder are markedly influenced by the b/B ratio. Under certain combinations of b/B ratio, relative position and reduced velocity, test cylinder vibrations are considerably magnified and in certain other combinations they are suppressed. Flow visualization results are provided in an attempt to bring out the influence of b/B ratio and also to explain the observed vibratory features of the test cylinder.

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Flow-induced Oscillations Of A Circular Cylinder Due To Interference Effects

Cited by 14 publications

References 0 publications

Flow-induced vibration of a square cylinder without and with interference

Flow-induced vibration of a square cylinder without and with interference

Influence of corner radius on the near wake structure of a transversely oscillating square cylinder

Interference excitation of a square section cylinder

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