Experimental study on suppression of vortex street behind perforated square cylinder

Teimourian, Amir; Hacisevki, Hasan; Bahrami, Arian

doi:10.15632/jtam-pl.55.4.1397

Cited by 7 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, a number of researchers [20][21][22][23][24][25] investigated the passive flow control methodology of perforated surfaces. Castro [21] investigated the wake behind perforated flat plates normal to flow experimentally.…”

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

“…Hence, by the aid of the jet, the vortex formation phenomena was shifted downstream in the wake region. Teimourian and Hacişevki [20] took a passive flow control approach to investigate perforated surfaces and the effects of fluid entrainment on the vortex shedding phenomenon and possible suppression in the wake region of square cylinder. The research investigated the wake region behind the cylinder in terms of the coherent flow structure, time averaged properties and effectiveness of different perforations.…”

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

See 1 more Smart Citation

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Teimourian¹,

Teimourian²

2021

Eng

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Teimourian¹,

Teimourian²

2021

Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…The study demonstrates that the optimum case happened where suction was applied through all surfaces of the cylinder concerning heat transfer. Teimourian et al (2017) experimentally studied the effects of wake suppression by entrainment of fluid around the perforated square cylinder on the flow structure and vortex shedding. Some results show HFF 32,4 that velocity profiles and flow structure has been affected by different perforated surfaces and, as a result, wake structures have been reduced considerably.…”

Section: Effects Of Uniform Injectionmentioning

confidence: 99%

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

Vakhshouri

Çuhadaroğlu

2021

HFF

View full text Add to dashboard Cite

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.

show abstract

“…They observed 86, 92 and 90% reduction for drag coefficient, root-mean-square value of lift coefficient (C Lrms ) and drag coefficient (C Drms ), respectively. In the literature one can find more different types of passive flow control devices used for square cylinders [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of reduction of fluid forces acting on a square cylinder using a control plate

Zia-ul-Islam

Shams-ul-Islam

Zhou

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

A numerical study on the effects of control plate on the fluid force reduction on a square cylinder has been carried out using lattice Boltzmann method where a configuration of a square cylinder with upstream control plate is studied. In the present computations we have studied the important flow characteristics for 0.1 ≤ l/w ≤ 1 and 1 ≤ g/D ≤ 10. The effects of the l/w and g/D on force reduction, flow separation and vortex shedding frequency have been studied with Reynolds number focused on 150. Vorticity structures, vortex shedding frequency and fluctuating forces and time-mean are presented and discussed. It was found that considerable change in the wake structure and fluid forces depending on the values of l/w and g/D. The numerical results show that there exists an optimum position where the force coefficients acting on the main square cylinder attains their minimum values. At the optimum position, the mean drag coefficient is reduced by 139.3%. Four different flow regimes were identified in this study at different g/D for selected range of l/w. The negative values of drag coefficient for the main square cylinder are also found for different combinations of l/w and g/D.

show abstract

Experimental study on suppression of vortex street behind perforated square cylinder

Cited by 7 publications

References 16 publications

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

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

Numerical study of reduction of fluid forces acting on a square cylinder using a control plate

Contact Info

Product

Resources

About