On the new vortex shedding mode past a rotating circular cylinder

Stojković, Dragan; Schön, Philipp A.E.; Breuer, M.; Durst, F.

doi:10.1063/1.1562940

Cited by 85 publications

(54 citation statements)

References 8 publications

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“…Coutanceau & Ménard 1985;Badr et al 1990;Kang, Choi & Lee 1999;He et al 2000;Stojković, Breuer & Durst 2002;Mittal & Kumar 2003;Rao et al 2013). Over a small range of α 4 there is a secondary region of wake unsteadiness, comprising low-frequency one-sided vortices, as shown by Mittal & Kumar (2003), Stojković et al (2003) and Pralits, Brandt & Giannetti (2010). Numerical simulations have shown that the critical Reynolds number of the secondary instability associated with the spanwise undulation of the von Kármán vortices increases with Reynolds number (El Akoury et al 2008;Rao et al 2015).…”

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confidence: 97%

Experimental investigation of flow-induced vibration of a rotating circular cylinder

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18605 While flow-induced vibration of bluff bodies has been extensively studied over the last half-century, only limited attention has been given to flow-induced vibration of elastically mounted rotating cylinders. Since recent low-Reynolds-number numerical work suggests that rotation can enhance or suppress the natural oscillatory response, the former could find applications in energy harvesting and the latter in vibration control. The present experimental investigation characterises the dynamic response and wake structure of a rotating circular cylinder undergoing vortex-induced vibration at a low mass ratio (m * = 5.78) over the reduced velocity range leading to strong oscillations. The experiments were conducted in a free-surface water channel with the cylinder vertically mounted and attached to a motor that provided constant rotation. Springs and an air-bearing system allow the cylinder to undertake low-damped transverse oscillations. Under cylinder rotation, the normalised frequency response was found to be comparable to that of a freely vibrating non-rotating cylinder. At reduced velocities consistent with the upper branch of a non-rotating transversely oscillating cylinder, the maximum oscillation amplitude increased with non-dimensional rotation rate up to α ≈ 2. Beyond this, there was a sharp decrease in amplitude. Notably, this critical value corresponds approximately to the rotation rate at which vortex shedding ceases for a non-oscillating rotating cylinder. Remarkably, at α = 2 there was approximately an 80 % increase in the peak amplitude response compared to that of a non-rotating cylinder. The observed amplitude response measured over the Reynolds-number range of (1100 Re 6300) is significantly different from numerical predictions and other experimental results recorded at significantly lower Reynolds numbers.

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confidence: 97%

Experimental investigation of flow-induced vibration of a rotating circular cylinder

et al. 2017

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“…The critical α values are presented in Figure 9 for different Reynolds numbers in comparison with the results of Stojkovic et al (2003) and Mittal & Kumar (2003). This figure shows a stability map with the three curves representing the rotation rates (α L1 ; α L2 and α L3 ) at which three transitions between steady and unsteady flows with the four flow regimes are found: I VS (vortex shedding) regime for α ≤ α L1 , I Steady regime at α L1 < α < α L2 , II VS (vortex shedding) regime for α L2 ≤ α ≤ α L3 and II Steady regime for α > α L3 .…”

Section: Flow Transitionsmentioning

confidence: 99%

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Bouakkaz

Talbi

Ouazzazi

et al. 2015

Braz. J. Chem. Eng.

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-In this work, forced convection heat transfer past a rotating circular cylinder with a constant nondimensional rotation rate α varying from 0 to 6 was investigated for Reynolds numbers of 20-200 and a Prandtl number of 0.7. The numerical calculations are carried out by using a finite-volume method based commercial computational fluid dynamics solver FLUENT. The successive changes in the flow pattern are studied as a function of the rotation rate. Suppression of vortex shedding occurs as the rotation rate increases (α > 2). A second kind of instability appears for higher rotation speed where a series of counter-clockwise vortices is shed in the upper shear layer. The rotation attenuates the secondary instability and increases the critical Reynolds number for the appearance of this instability. In addition, time-averaged (lift and drag coefficients and Nusselt number) results were obtained and compared with the literature data. A good agreement was obtained for both the local and averaged values.

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“…The correlations proposed by Zukauskas [25] have been widely practiced to compute the average Nusselt number in different ranges of Reynolds number. Saparrow et al [26] proposed a correlation to predict average Nusselt number for a wide range of Reynolds and Prandtl number: …”

Section: Re Prmentioning

confidence: 99%

Free stream flow and forced convection heat transfer across rotating circular cylinder in steady regime: effects of rotation, Prandtl number and thermal boundary condition

2015

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Free stream flow and forced convection heat transfer across a rotating circular cylinder have been investigated numerically for the range of Reynolds number between 5 and 40 (5 ≤ Re ≤ 40). The non-dimensional rotation rate, α is employed upto a maximum value of 5. The governing equations namely, continuity, momentum, and energy equations have been solved in 2D steady laminar flow regime for the range of Prandtl number between 0.7 and 67 (0.7 ≤ Pr ≤ 67). Uniform heat flux (UHF) and constant wall temperature (CWT) boundary conditions have been considered, separately, for the range of afore mentioned parameters. New results are presented depicting the behavior of temperature field around the cylinder rotating in a high Pr environment (Pr ≥ 33) with non-dimensional rotation rate in the range between 0 and 5 (0 ≤ α ≤ 5). It is noted that the heat transfer across the cylinder becomes increasingly independent of the thermal boundary condition i.e. UHF or CWT.

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On the new vortex shedding mode past a rotating circular cylinder

Cited by 85 publications

References 8 publications

Experimental investigation of flow-induced vibration of a rotating circular cylinder

Experimental investigation of flow-induced vibration of a rotating circular cylinder

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Free stream flow and forced convection heat transfer across rotating circular cylinder in steady regime: effects of rotation, Prandtl number and thermal boundary condition

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