Vortex shedding suppression and aerodynamic characteristics of square cylinder due to offsetting of rectangular cylinders towards a plane

Maiti, Dilip K.; Bhatt, Rajesh

doi:10.1016/j.oceaneng.2014.02.033

Cited by 20 publications

(3 citation statements)

References 48 publications

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“…They showed that using a control plate delays the onset of vortex shedding. Maiti and Bhatt (2014) studied the dynamic behavior of a flow exposed square cross-section cylinder above which a rectangular cylinder was installed as flow controller. Chen and Shao (2013) empirically studied the effect of the presence of a smaller object behind the main cylinder as flow controller.…”

Section: Transversementioning

confidence: 99%

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Farahani

Rabiee

2021

HFF

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Purpose) In this study, for the first time, the efficacy of control rods for full suppression of vortex-induced vibrations (VIV) and galloping of an elastically supported rigid square cylinder that vibrates freely in the cross-flow direction is investigated. Design/methodology/approach To this aim, two small control rods are placed at constant angles of ± 45° relative to the horizontal axis and then the influence of diameter and spacing ratios on the oscillation and hydrodynamic response along with the vortex structure behind the cylinder is evaluated in the form of nine different cases in both VIV and galloping regions. Findings The performed simulations show that using the configuration presented in this study results in full VIV suppression for the spacing ratios G/D = 0.5, 1 and 1.5 at the diameter ratios d/D = 0.1, 0.2 and 0.3 (D: diameter of square cylinder, G: distance between rods and cylinder, d: diameter of rods). On the contrary, a perfect attenuation of galloping is only achieved at the largest diameter (d/D = 0.3) and the smallest spacing ratio (G/D = 0.5). In general, for both VIV and galloping regions, with increasing diameter ratio and decreasing spacing ratio, the effect of the control rods wake in the vortex street of square cylinder gradually increases. This trend carries on to the point where the vortex shedding is completely suppressed and only the symmetric wake of control rods is observed. Originality/value So far, the effect of rod control on VIV of a square cylinder and its amplitude of oscillations has not been investigated.

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Section: Transversementioning

confidence: 99%

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Farahani

Rabiee

2021

HFF

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“…Their results indicate that the peak of vortex shedding frequency decreases during steady plasma actuation of 10 dB. Maiti and Bhatt [17] investigated vortex shedding suppression for a square obstacle by a family of upstream rectangular obstacles. Their study indicated that the aerodynamic forces acting on the downstream obstacle (main obstacle) decreases by increasing height of the upstream obstacle (virtual or control obstacle).…”

Section: Introductionmentioning

confidence: 99%

The effect of magnetic field on instabilities of heat transfer from an obstacle in a channel

Rashidi

Esfahani

2015

Journal of Magnetism and Magnetic Materials

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“…Jafari.S et al [2] simulated the flow over a square cylinder in square channel by lattice Boltzmann method. The effect of distance between the cylinders S, Height of the cylinder L, height ratio r1, aspect ratio r2, with Re was numerically investigated by maiti et al [3]. Distance between cylinder plays major role in the vortex shedding in cylinder placed in confined environment with increasing aspect the flow pattern is varied and the flow patterns is essentially minimum between the cylinders.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Forced Convection Heat Transfer from Offset Square Cylinders Placed in a Three Dimensional Confined Channel

Paulraj

Sivasubramanian

Kanna

et al. 2015

AMM

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Abstract-Flow over two offset square cylinders in a confined channel is simulated for different Reynoldsnumber to reveal the forced convection heat transfer from the heated square cylinders to the ambientfluid. The bottom of the cylinder is maintained at constant temperature. The distance between thecylinder in normal direction as well as transverse direction are fixed as 2d and the blockage ratio is fixedas 0.167. Heat transfer from the cylinders to the ambient fluid as well as conducted within solid wallthrough conjugate interface boundary investigated in connection with Reynolds number are reportedfor both steady and periodic flow. Simulation is carried out for Reynolds number varies from 10 to100 for the fluid as air with Prandtl number as 0.71. The isotherm contours, local Nusselt number andaverage Nusselt number are reported for various Reynolds number. The stagnation zone results higherNusselt number than remaining walls and rear wall results lowest Nusselt number. The downstreamcylinder results higher Nusselt number than the upstream cylinder. The top and bottom surfaceNusselt number from upstream and downstream cylinder are not analogous to single cylinder placed ina channel.

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Vortex shedding suppression and aerodynamic characteristics of square cylinder due to offsetting of rectangular cylinders towards a plane

Cited by 20 publications

References 48 publications

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

The effect of magnetic field on instabilities of heat transfer from an obstacle in a channel

Numerical Investigation of Forced Convection Heat Transfer from Offset Square Cylinders Placed in a Three Dimensional Confined Channel

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