A numerical study on turbulent flow around a square cylinder with uniform injection or suction

Çuhadaroğlu, Burhan

doi:10.1108/09615530910972977

Cited by 12 publications

(8 citation statements)

References 16 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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“…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%

“…The significant changes of the flow wake structure by employing injection are completely apparent as the vortices disappear for higher injection parameters due to the suppression of vortex shedding. Çuhadaroğlu and Turan [15] and Çuhadaroğlu [16] numerically studied the effects of uniform injection and suction through a porous square cylinder on the wake flow and its aerodynamic characteristics. It was observed that despite the lower velocity magnitude of injection and suction velocity relative to the main flow, drag and lift coefficients and vortex shedding frequency had been affected significantly.…”

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

“…It was observed that for a low value of porosity, the vortex street dominates the wake and its strength decreases as the vorticity in the shear layers decreases with the introduction of bleed air. On the other hand, it was suggested for high values of porosity Çuhadaroglu and Turan [15] and Çuhadaroglu [16] numerically studied the effects of uniform injection and suction through a porous square cylinder on the wake flow and its aerodynamic characteristics. It was observed that despite the lower velocity magnitude of injection and suction velocity relative to the main flow, drag and lift coefficients and vortex shedding frequency had been affected significantly.…”

Section: Perforated Bluff Bodiesmentioning

confidence: 99%

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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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“…Mass transfer through surface plays vital role in controlling boundary layer separation and many researchers have studied the influence of uniform suction/injection over different geometries (Tashtoush et al, 2000;Cuhadaroglu, 2009;Datta et al, 2009). Mass transfer through a wall slot (i.e.…”

Section: Introductionmentioning

confidence: 99%

Boundary layer flow over a yawed cylinder with variable viscosity

Saikrishnan

2012

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this paper is to study the effect of non-uniform double slot suction (injection) into a steady laminar boundary layer flow over a yawed cylinder when fluid properties such as viscosity and Prandtl number are inverse linear functions of temperature. Non-similar solutions have been obtained from the starting point of the streamwise co-ordinate to the exact point of separation. Design/methodology/approach -The governing equations are tackled by the implicit finite difference scheme in combination with the quasi-linearization technique. Quasi-linear technique can be viewed as a generalization of the Newton-Raphson approximation technique in functional space. An iterative sequence of linear equations is carefully constructed to approximate the nonlinear equations for achieving quadratic convergence and monotonicity. The quadratic convergence and monotonicity are unique characteristics of the quasilinear implicit finite difference scheme, which makes this scheme superior to built-in iteration of upwind or finite amplitude techniques. Findings -The results indicate that the separation can be delayed by non-uniform double slot suction and also by moving the slot downstream. However, the effect of non-uniform double slot injection is just the opposite. Yaw angle has very little affect on the location of the point of separation. Originality/value -This analysis is useful in understanding many boundary layer problems of practical importance for undersea applications, for example, in suppressing recirculating bubbles and controlling transition and/or separation of the boundary layer over submerged bodies.

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A numerical study on turbulent flow around a square cylinder with uniform injection or suction

Cited by 12 publications

References 16 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

Boundary layer flow over a yawed cylinder with variable viscosity

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