Journal ArticleDOI
Influence of Staggering Angle of a Rotating Rod on Flow Past a Circular Cylinder
T. Ayyappan,S. Vengadesan +1 more
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In this article, the influence of the staggering position of a rotating rod on flow past a main circular cylinder is investigated numerically, and the effect of the diameter ratio of the rotating rod is studied by considering two different diameter ratios.Abstract:
The influence of the staggering position of a rotating rod on flow past a main circular cylinder is investigated numerically. The rod is rotated at a constant speed ratio of 3. The effect of the diameter ratio of the rotating rod is studied by considering two different diameter ratios. The investigation is carried out at a fixed pitch length of 1. The study is carried out for two Reynolds number, viz., 100 and 500. The momentum injection from the rod is found to alter the flow characteristics behind the main cylinder. For a certain arrangement of stagger angle and diameter ratio, the vortex shedding behind the main cylinder gets suppressed. The corresponding configuration for which minimum drag coefficient is achieved is suggested from this study.read more
Citations
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Journal ArticleDOI
Numerical investigation of fluid flow past circular cylinder with multiple control rods at low Reynolds number
Lin Lu,Mingming Liu,Bin Teng,Zhendong Cui,Zhendong Cui,Guoqiang Tang,Ming Zhao,Liang Cheng,Liang Cheng +8 more
TL;DR: In this paper, the effects of rod-to-cylinder spacing ratio, rod and cylinder diameter ratio, cylinder Reynolds number, number of control rods and angle of attack on the hydrodynamics of the main circular cylinder are investigated.
Journal ArticleDOI
Numerical Investigation of Flow and Heat Transfer Characteristics of Two Tandem Circular Cylinders of Different Diameters
Necati Mahir,Zekeriya Altaç +1 more
TL;DR: In this paper, the authors investigated laminar flow and heat transfer characteristics from a downstream cylinder of two tandem circular cylinders of different in diameters, where the working fluid is air and the downstream cylinder is isothermal while the upstream cylinder is kept adiabatic.
Journal ArticleDOI
A computational study of drag reduction and vortex shedding suppression of flow past a square cylinder in presence of small control cylinders
TL;DR: In this article, a two-dimensional numerical study of the unsteady laminar flow from a square cylinder in presence of multiple small control cylinders is presented and discussed in terms of instantaneous vorticity contours visualization, time-trace analysis of drag and lift coefficients and power spectra analysis of lift coefficient.
Journal ArticleDOI
Wall proximity effects on the effectiveness of upstream control rod
K. Shaafi,S. Vengadesan +1 more
TL;DR: In this article, a two dimensional flow over a circular cylinder with an upstream control rod of same diameter is simulated in unbound condition and in wall bounded conditions, where cylinders are placed at various heights from the wall and the inter-distance between cylinders is also varied.
Experimental and theoretical investigation of the effect of rotating circular cylinder speed on the lift and drag forces
Ghassan Fadhil Smaisim,Oula Fatla,Agustin Valera Medina,Abdul Muhsin A. Rageb,Nicholas Syred +4 more
TL;DR: In this article, a laminar infinite flow of viscous incompressible fluid around a rotating circular cylinder at Reynolds number 80,120,160 and dimensionless rotation rate, α, (ratio of cylinder surface speed to the free stream velocity) varying from 0 to 6 has been carried out.
References
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Journal ArticleDOI
Three-dimensional Floquet stability analysis of the wake of a circular cylinder
TL;DR: In this paper, a global numerical stability analysis of the periodic wake of a circular cylinder for Reynolds numbers between 140 and 300 is presented, showing that the two-dimensional wake becomes (absolutely) linearly unstable to three-dimensional perturbations at a critical Reynolds number of 1885±10.
Journal ArticleDOI
Numerical simulation of flow interference between two circular cylinders in tandem and side-by-side arrangements
TL;DR: In this article, the shedding of vortices and flow interference between two circular cylinders in tandem and side-by-side arrangements are investigated numerically in a Fractional Step Method and the flow is assumed two-dimensional.
Journal ArticleDOI
The instability of the shear layer separating from a bluff body
TL;DR: In this article, it was shown that the spanwise end conditions which control the primary mode of vortex shedding significantly affect the shear-layer instability and contributed to the large discrepancy in quoted values of the critical Reynolds number.
Journal ArticleDOI
Laminar flow past a rotating circular cylinder
TL;DR: In this paper, the authors numerically investigated two-dimensional laminar flow past a circular cylinder rotating with a constant angular velocity, for the purpose of controlling vortex shedding and understanding the underlying flow mechanism.
Journal ArticleDOI
Unsteady incompressible flows past two cylinders in tandem and staggered arrangements
TL;DR: In this paper, a stabilized finite element formulation is employed to study incompressible flows past a pair of cylinders at Reynolds numbers 100 and 1000 in tandem and staggered arrangements, and the results show that the qualitative nature of the flow depends strongly on the arrangement of cylinders and the Reynolds number.
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