The effects of surface injection through a perforated square cylinder on some aerodynamic parameters

Turhal, Ahmet Ömür; Çuhadaroğlu, Burhan

doi:10.1016/j.expthermflusci.2009.12.014

Cited by 13 publications

(8 citation statements)

References 17 publications

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“…Cuhadaroglu and Turhal studied the effects of suction and blowing on surfaces of square cylinders by experiment and numerical simulation. Some similar conclusions about the aerodynamic drag force and Strouhal number were also obtained [9][10][11][12].…”

Section: Introductionsupporting

confidence: 76%

Numerical Investigation on Aerodynamic Force of Streamlined Box Girder with Uniform Air Suction

Ke¹,

Cong²,

Zhou³

et al. 2014

JESTR

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In the present study, the flow around a streamlined box girder with uniform air suction has been investigated numerically. Two-dimensional incompressible unsteady Reynolds averaged Navier-Stokes (URANS) equations are solved in conjunction with the SST k ω − turbulence model in simulations. Taking the Great Belt Bridge girder as an example, cases of different suction positions on the girder section were discussed. The effect of the suction ratio and the angle of attack (AOA) of wind also were investigated. The result showed that the aerodynamic drag force was influenced by the uniform suction through either upper surface or lower surface of the box girder. The larger the suction ratio was, the more the drag-reducing could be. The suction position and AOA had a comprehensive effect on the drag force. The vortex shedding frequency was also affected by air suction. For the aerodynamic lift force and moment, air suction showed no obvious influence. If necessary, using a combined suction scheme to reduce the aerodynamic drag force or to control the flow wake would be more efficient in engineering design.

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Section: Introductionsupporting

confidence: 76%

Numerical Investigation on Aerodynamic Force of Streamlined Box Girder with Uniform Air Suction

Ke¹,

Cong²,

Zhou³

et al. 2014

JESTR

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show abstract

“…Çuhadaroglu and Akansu [14], Çuhadaroglu and Turan [15], Çuhadaroglu [16], Turhal and Çuhadaroglu [17] and Sohankar and Khodadadi [18] employed an active control method with the injection/suction of fluid through the surfaces of the square cylinder to reduce the damaging effect of the vortex shedding phenomenon. Çuhadaroglu and Akansu [14] conducted an experimental study to investigate the injection effects on the pressure coefficient and drag coefficient of a perforated square cylinder at high Reynolds number between Re = 10,000 and 24,000.…”

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

“…Moreover, injection through the other faces have demonstrated negligible effects. Turhal and Çuhadaroglu [17] experimentally studied the variation of the pressure coefficient, drag coefficient and Strouhal number of a perforated square cylinder (horizontal and diagonal) with fluid injected through various surfaces at a high Reynolds number. The result revealed that in the case of a diagonal square cylinder, surface injection through the top-rear, rear and all surfaces reduced the drag coefficient.…”

Section: Perforated Bluff Bodiesmentioning

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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“…The numerical results reveal that increasing suction decreases the drag for almost all of the suction configurations while applying suction from the top/bottom surfaces weakens the vortex shedding. Turhal and Çuhadaroǧlu (2010) experimentally analyzed the drag coefficient and the Strouhal number in case of the injection through various perforated surfaces of the horizontal and diagonal square cylinders at Re = 10,000, 16,000 and 24,000. They revealed that surface injection through the top-rear, rear and all surfaces of a diagonal square cylinder reduces the drag coefficient for all Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Effects of uniform injection and suction through perforated pentagonal cylinders on the flow and heat transfer

Vakhshouri

Çuhadaroğlu

2021

HFF

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Purpose The purpose of this paper is to study the effects of uniform injection and suction through a perforated pentagonal cylinder on the flow field and heat transfer. Design/methodology/approach The finite-volume method has been used to solve the ensemble-averaged Navier-Stokes equations for incompressible flow at moderate Reynolds number (Re = 22,000) with the k-ɛ turbulence model equations. Findings A computational fluid dynamics analysis of turbulent flow past a non-regular pentagonal cylinder with three different aspect ratios aspect ratios has been carried out to investigate the effects of uniform injection/suction through the front and all surfaces of the cylinder. It is found that flow field parameters such as drag coefficient, pressure coefficient and Nusselt number are affected considerably in some cases depend on injection/suction rate (Γ) and perforated wall position. Research limitations/implications To optimize the efficiency of the injection and suction through a perforated surface, both wide-ranging and intensive further studies are required. Using various perforation ratios and injection/suction intensities are some possibilities. Practical implications Control of the vortex shedding and wake region behind bluff bodies is of vital interest in fluid dynamics. Therefore, applying uniform injection and suction from a perforated bluff body into the main flow can be used as a drag reduction mechanism, thermal protection and heat transfer enhancement. Originality/value This study provides unique insights into the active flow control method around pentagonal cylinders that can be useful for researchers in the field of fluid dynamics and aeronautics.

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The effects of surface injection through a perforated square cylinder on some aerodynamic parameters

Cited by 13 publications

References 17 publications

Numerical Investigation on Aerodynamic Force of Streamlined Box Girder with Uniform Air Suction

Numerical Investigation on Aerodynamic Force of Streamlined Box Girder with Uniform Air Suction

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Effects of uniform injection and suction through perforated pentagonal cylinders on the flow and heat transfer

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