Three-dimensional aspects of cylinder drag reduction by suction and oscillatory blowing

Shtendel, Tom; Seifert, Avi

doi:10.1016/j.ijheatfluidflow.2013.10.009

Cited by 31 publications

(10 citation statements)

References 31 publications

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“…Shtendel applied an active flow control system by suction and oscillatory blowing to research the drag reduction and wake stabilization of a circular cylinder. The system seemed efficient and robust [7].…”

Section: Introductionmentioning

confidence: 94%

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: Introductionmentioning

confidence: 94%

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

Ke¹,

Cong²,

Zhou³

et al. 2014

JESTR

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“…Suction/blowing method, one of the most effective active flow-control methods, has been widely used in many aspects, such as bluff body (Mathelin and Maitre 2009 ; Weller et al 2009 ; Zheng and Zhang 2012 ; Shtendel and Seifert 2014 ; Chen et al 2013 ; Muralidharan et al 2013 ; Boujo and Gallaire 2014 ; Sohankar et al 2015 ; Layek et al 2008a ), backward-facing step (Kaiktsis and Monkewitz 2003 ), symmetric sudden expanded channel (Layek et al 2008b ), and plane Poiseuille flow (Gao and Lu 2006 ). In recent years, several researchers have studied the effect of suction/blowing on flow past the bluff body.…”

Section: Introductionmentioning

confidence: 99%

“…Zheng and Zhang ( 2012 ) investigated the performance and mechanism of suction control on drag reduction for a high-rise building. Shtendel and Seifert ( 2014 ) conducted experiments on active flow control to control flow around a circular cylinder at transitional Reynolds number, for drag reduction and wake stabilization by applying the combined steady suction and pulsed blowing in close proximity. Chen et al ( 2013 ) conducted an experimental investigation to mitigate vortex-induced vibration of a circular cylinder by using a steady suction flow method.…”

Section: Introductionmentioning

confidence: 99%

Effects of wall suction/blowing on two-dimensional flow past a confined square cylinder

Zhang

Jiang

et al. 2016

SpringerPlus

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A numerical simulation is conducted to study the laminar flow past a square cylinder confined in a channel (the ratio of side length of the square to channel width is fixed at 1/4) subjected to a locally uniform blowing/suction speed placed at the top and bottom channel walls. Governing equations with boundary conditions are resolved using a finite volume method in pressure–velocity formulation. The flow patterns relevant to the critical spacing values are investigated. Numerical results show that wall blowing has a stabilizing effect on the flow, and the corresponding critical Reynolds number increases monotonically with increasing blowing velocity. Remarkably, steady asymmetric solutions and hysteretic mode transitions exist in a certain range of parameters (Reynolds number and suction speed) in the case of suction.

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“…Kim & Choi (2005) imposed spanwise varying blowing/suction on the surface of a cylinder to trigger spanwise phase-mismatch of vortex shedding and thus to reduce drag. Shtendel & Seifert (2014) adopted a combination of blowing and suction around the separation points to delay separation and reduce vortex shedding at Reynolds number up to 250 × 10 3 . Most of the previous numerical studies dealing with active control of vortex shedding targeted low Reynolds number flows (Re ≤ 200) and did not concentrate on the optimal or most effective control of vortex shedding, which is the goal of the current work.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optimal suppression of vortex shedding from a circular cylinder

2015

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This study is focused on two-and three-dimensional incompressible flow past a circular cylinder for Re ≤ 1000. To gain insight into the mechanisms underlying the suppression of unsteadiness for this flow we determine the nonlinear optimal open-loop control driven by surface-normal wall transpiration. The spanwise-constant wall transpiration is allowed to oscillate in time although steady forcing is determined to be most effective. At low levels of control cost, defined as the square integration of the control, the sensitivity of unsteadiness with respect to wall transpiration is a good approximation of the optimal control. The distribution of this sensitivity suggests that the optimal control at small magnitude is achieved by applying suction upstream of the upper and lower separation points and blowing at the trailing edge. At high levels of wall transpiration the assumptions underlying the linearised sensitivity calculation become invalid since the base flow is eventually altered by the size of the control forcing. The large magnitude optimal control is observed to spread downstream of the separation point, draw the shear layer separation towards the rear of the cylinder through suction while blowing along the centreline eliminates the recirculation bubble in the wake. We further demonstrate that it is possible to completely suppress vortex shedding in two-and three-dimensional flow past a circular cylinder up to Re = 1000, accompanied by 70% drag reduction when a nonlinear optimal control of moderate magnitude (with root mean square value 8% of the free stream velocity) is applied. This is confirmed through linearised stability analysis about the steady state solution when the nonlinear optimal wall transpiration is applied. While continuously distributed wall transpiration is not physically realisable, the study highlights localised regions where discrete control strategies could be further developed. It also highlights the appropriate range of application for linear and nonlinear optimal control to this type of flow problem.

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Three-dimensional aspects of cylinder drag reduction by suction and oscillatory blowing

Cited by 31 publications

References 31 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

Effects of wall suction/blowing on two-dimensional flow past a confined square cylinder

Nonlinear optimal suppression of vortex shedding from a circular cylinder

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