Experimental investigation of wake evolution behind a couple of flat discs in a hydrochannel

Naumov, I. V.; Litvinov, I. V.; Mikkelsen, Robert Flemming; Okulov, Valery

doi:10.1134/s0869864316050048

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…Therefore, the vortex shedding phenomenon's importance develops a growing interest in researchers to dedicate their research on this phenomenon to investigate bluff bodies such as a circular cylinder, square cylinder or flat plate resembling structures in engineering [1][2][3][4][5][6][7][8][9]. The application of the research varies from wind turbines and the wind energy sector [10][11][12] to building aerodynamics [13], which provide additional insight to Eng 2021, 2 326 the understanding of the shedding phenomenon for design stages.…”

Section: Introductionmentioning

confidence: 99%

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Teimourian¹,

Teimourian²

2021

Eng

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Vortex shedding phenomenon behind bluff bodies and its destructive unsteady wake can be controlled by employing active and passive flow control methods. In this quest, researchers employed experimental fluid dynamics (EFD), computational fluid dynamics (CFD) and an analytical approach to investigate such phenomena to reach a desired outcome. This study reviews the available literature on the flow control of vortex shedding behind bluff bodies and its destructive wake through the modification of the geometry of the bluff body. Various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder have been reviewed. The effectiveness of these methods has been discussed in terms of drag variation, wake structure modifications and Strouhal number alteration.

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Section: Introductionmentioning

confidence: 99%

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Teimourian¹,

Teimourian²

2021

Eng

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Influence of repeating elements on the far wake characteristics

Litvinov

Yusupov

Naumov

et al. 2018

AIP Conference Proceedings

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Numerical study on the flow over two circular disks in tandem arrangement

et al. 2019

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The flows over the two circular disks in tandem arrangement at low Reynolds numbers are numerically studied using large-eddy simulations. Both disks have the same aspect ratio (χ = d/w = 5, where d and w are, respectively, the diameter and the thickness of the disk), while the upstream disk has a coaxial hole in D diameter. First, the effect of the Reynolds number on the near-wake evolution of the tandem disks with spacing of l/d = 0.1 is investigated. Compared with a single circular disk, it is found that the upstream apertured disk (D/d = 0.2) delays the wake transition. Four bifurcations, i.e., “Steady state,” “Zig-zig,” “Zig-Zag,” and “Weakly chaotic” modes, are captured at critical Reynolds numbers of 178, 207, 212, and 275, respectively. Second, the effect of disk spacing on near-wake evolution is studied for Re = 200 and D/d = 0.2. The wake is steady and planar-symmetric at l/d = 1, in which a totally new wake mode characterized by a three-thread wake is observed. The wake becomes unsteady but planar-symmetric at l/d = 1.5. At l/d = 2, however, the planar-symmetric wake structures are all broken. The upstream disk wake retains planar-symmetry, while the downstream disk wake is similar to the “Reflectional-symmetry-broken” mode in a single disk wake. The planar symmetry is recovered for both disks at l/d = 6. It is found that for l/d > 3, the interaction between the two disks becomes weaker as the spacing increases. Finally, the effect of disk spacing on the drag and lift coefficients for each disk is examined. When disk spacing is constant, the lift coefficient of the upstream disk is always lower than that of the downstream disk. The drag coefficient of each disk in tandem is smaller than that of a single disk. With the increase in disk spacing, the drag coefficient of the upstream disk changes little while the drag coefficient of the downstream disk increases rapidly.

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Experimental investigation of wake evolution behind a couple of flat discs in a hydrochannel

Cited by 6 publications

References 17 publications

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Influence of repeating elements on the far wake characteristics

Numerical study on the flow over two circular disks in tandem arrangement

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