Flow control of a circular cylinder by using an attached flexible filament

Wu, Jie; Qiu, Yunlong; Chen, Shu; Zhao, Ning

doi:10.1063/1.4896942

Cited by 68 publications

(46 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that these studies considered very low values of structure-fluid density ratio ((0.1)) as well as flexural rigidity ((0.001)-(0.1)), which is two-three orders of magnitude lesser than the values used in the present study. An attached filament on a cylinder also helps in reducing mean drag as well as fluctuations of lift on the cylinder, as reported by Wu et al [22].…”

Section: Studies On Steady/pulsatile Inflow Past Flexible Thin Structmentioning

confidence: 60%

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

Kundu

Soti

Bhardwaj

et al. 2017

Journal of Fluids and Structures

View full text Add to dashboard Cite

The flow-induced deformation of a thin, elastic splitter plate attached to the rear of a circular cylinder and subjected to laminar pulsatile inflow is investigated. The cylinder and elastic splitter plate are contained within a narrow channel and the Reynolds number is mostly restricted to Re = 100, primarily covering the two-dimensional flow regime. An in-house fluidstructure interaction code is employed for simulations, which couples a sharp-interface immersed boundary method for the fluid dynamics with a finite-element method to treat the structural dynamics. The structural solver is implicitly (two-way) coupled with the flow solver using a partitioned approach. This implicit coupling ensures numerical stability at low structure-fluid density ratios. A power spectrum analysis of the time-varying plate displacement shows that the plate oscillates at more than a single frequency for pulsatile inflow, compared to a single frequency observed for steady inflow. The multiple frequencies obtained for the former case can be explained by beating between the applied and plate oscillatory signals. The plate attains a self-sustained time-periodic oscillation with a plateau amplitude in the case of steady flow, while the superimposition of pulsatile inflow with induced plate oscillation affects the plateau amplitude. Lock-in of the plate oscillation with the pulsatile inflow occurs at a forcing frequency that is twice of the plate natural frequency in a particular mode and this mode depends on the plate length. The plate displacement as well as pressure drag increases at the lock-in condition. The percentage change in the maximum plate 2 displacement, and skin-friction and pressure drag coefficients on the plate, due to pulsatile inflow is quantified. The non-linear dynamics of the plate and its coupling with the pulsatile flow are briefly discussed.

show abstract

Section: Studies On Steady/pulsatile Inflow Past Flexible Thin Structmentioning

confidence: 60%

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

Kundu

Soti

Bhardwaj

et al. 2017

Journal of Fluids and Structures

View full text Add to dashboard Cite

show abstract

“…To validate the present computational procedure, a preliminary calculation was carried out for Re=150 and an amplitude of the membrane A = 0 m. We note that for this amplitude, the membrane appears to be at rest. The Strouhal number St, the mean drag coefficient ⟨C d ⟩ and the amplitude of the C l oscillation (C lmax ) are compared in Table 1 with those of Golani et al [27], Farhoud et al [28] and, Wu et al [3]. Results obtained with our computational model have a maximum deviation of the order of 3.5%, 6.8% and 4.5% on the Strouhal number, the mean drag coefficient and the amplitude of the C l oscillation respectively.…”

Section: Validation Of the Present Numerical Modelmentioning

confidence: 99%

“…Up to now, many techniques have been studied to control the flow with the aim to suppress the von Karman sheet or to influence the aerodynamic forces. These techniques varied from passive control which affects the surface of the bluff body, such as the addition of splitter plates [1,2], flexible filament [3], or changing its property like adding dimples [4] or grooves [5], to active control using synthetic jets [6][7][8][9], plasma actuators [10][11][12], blowing suction [13,14], flapping foil [15,16], electromagnetic forces [17,18] acoustic actuator [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…It seems that nowadays, the flexible objects represent an attractive research topic in the fluid control field, from free oscillation to the forced one many phenomena have been found. For example, inspired by the fish swimming, the free motion of a flexible plate attached to the rear side of a circular cylinder was investigated by Wu et al [3]. Their numerical results conducted for Reynolds number equal to 150 show a suppression of the vortex shedding, the vortex induced vibration as well as the fluctuation of the lift force.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation of the vibration effect of a flexible membrane on the flow behaviour around a circular cylinder

Maktouf

Moussa

Turki

2018

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

Active control of the flow behind a bluff body is obtained by integrating a vibrating membrane. A numerical study has been conducted to investigate the effect of the vibration of a flexible membrane, stuck to the rear side of a circular cylinder, on the global flow parameters such as the Strouhal number, the drag and lift coefficients. The shape of the membrane is evolving as a vibrating chord using a dynamic mesh. The governing equations of 2D and laminar flow have been solved using ANSYS Fluent 16.0 as a solver and the Gambit as a modeler. The motion of the membrane is managed by two parameters: frequency f and amplitude A. The effect of the flexible membrane motion is studied for the range of conditions as 0.1 Hz ≤ f ≤ 6 Hz and 5 × 10−4 m ≤ A ≤ 10−3 m at a fixed Reynolds number, Re = 150. Three different sizes of the flexible membrane have been studied. Results show that a beat phenomenon affects the drag coefficient. The amplitude does not affect significantly the Strouhal number as well as drag and lift coefficients. By increasing the size of the flexible membrane, we show a lift enhancement by a growth rate equal to 39.15% comparing to the uncontrolled case.

show abstract

“…The idea to use passive or active control strategies to improve the performance as well as the efficiency of certain applications is far from new and has been extensively investigated both numerically and experimentally. [1][2][3] Numerical modelling of fluid flows and mathematically rigorous theories for their control 4,5 have been usually first tested and verified in simplified conditions, at low or moderate Reynolds numbers. [6][7][8][9] Within this framework, the concept of structural sensitivity has gained interest with applications to a large variety of globally unstable flows.…”

Section: Introductionmentioning

confidence: 99%

Global stability and control of the confined turbulent flow past a thick flat plate

et al. 2017

View full text Add to dashboard Cite

This article investigates the structural stability and sensitivity properties of the confined turbulent wake behind an elongated D-shaped cylinder of aspect-ratio 10 at Re = 32 000. The stability analysis is performed by linearising the incompressible Navier-Stokes equations around the numerically computed and the experimentally measured mean flows. We found that the vortex-shedding frequency is very well captured by the leading unstable global mode, especially when the additional turbulent diffusion is modelled in the stability equations by means of a frozen eddy-viscosity approach. The sensitivity maps derived from the computed and the measured mean flows are then compared, showing a good qualitative agreement. The careful inspection of their spatial structure highlights that the highest sensitivity is attained not only across the recirculation bubble but also at the body blunt-edge, where tiny pockets of maximum receptivity are found. The impact of the turbulent diffusion on the obtained results is investigated. Finally, we show how the knowledge of the unstable adjoint global mode of the linearised mean-flow dynamics can be exploited to design an active feedback control of the unsteady turbulent wake, which leads, under the adopted numerical framework, to completely suppress its low-frequency oscillation. Published by AIP Publishing. [http://dx

show abstract

Flow control of a circular cylinder by using an attached flexible filament

Cited by 68 publications

References 55 publications

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

Numerical investigation of the vibration effect of a flexible membrane on the flow behaviour around a circular cylinder

Global stability and control of the confined turbulent flow past a thick flat plate

Contact Info

Product

Resources

About