Journal ArticleDOI
Forced-convection heat transfer from tandem square cylinders in cross flow at low Reynolds numbers
Ahmad Sohankar,Amin Etminan +1 more
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In this paper, the authors present the results of a numerical study on the flow characteristics and heat transfer over two equal square cylinders in a tandem arrangement, and the instantaneous and mean streamlines, vorticity and isotherm patterns for different Reynolds numbers are presented and discussed.Abstract:
This paper presents the results of a numerical study on the flow characteristics and heat transfer over two equal square cylinders in a tandem arrangement. Spacing between the cylinders is five widths of the cylinder and the Reynolds number ranges from 1 to 200, Pr=0.71. Both steady and unsteady incompressible laminar flow in the 2D regime are performed with a finite volume code based on the SIMPLEC algorithm and non-staggered grid. A study of the effects of spatial resolution and blockage on the results is provided. In this study, the instantaneous and mean streamlines, vorticity and isotherm patterns for different Reynolds numbers are presented and discussed. In addition, the global quantities such as pressure and viscous drag coefficients, RMS lift and drag coefficients, recirculation length, Strouhal number and Nusselt number are determined and discussed for various Reynolds numbers. Copyright © 2008 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
A numerical investigation of the flow over a pair of identical square cylinders in a tandem arrangement
TL;DR: In this article, a numerical study of the two-dimensional and three-dimensional unsteady flow over two square cylinders arranged in an in-line configuration for Reynolds numbers from 40 to 1000 and a gap spacing of 4D, where D is the cross-sectional dimension of the cylinders.
Journal ArticleDOI
Effect of thermal buoyancy on vortex shedding behind a square cylinder in cross flow at low Reynolds numbers
TL;DR: In this paper, the influence of cross buoyancy on the vortex shedding process behind a stationary heated square cylinder at low Reynolds numbers is analyzed in an unbounded medium, however, fictitious confining boundaries are chosen to make the problem computationally feasible.
Journal ArticleDOI
Low-Reynolds-number flow around a wall-mounted square cylinder: Flow structures and onset of vortex shedding
TL;DR: In this article, a direct numerical simulation is applied to investigate three-dimensional unsteady flow characteristics around a finite wall-mounted square cylinder with an aspect ratio of 7 at a Reynolds number (Re) of 40-250.
Journal ArticleDOI
Flow around six in-line square cylinders
TL;DR: In this paper, a flow regime map is proposed as a function of spacing and Reynolds number for six in-line square cylinders, where is the surface-to-surface distance between two cylinders, is the size of the cylinder and is the Reynolds number.
Journal ArticleDOI
Control of fluid flow and heat transfer around a square cylinder by uniform suction and blowing at low Reynolds numbers
TL;DR: In this paper, the effects of uniform suction and blowing through the surfaces of a square cylinder on the vortex shedding, wake flow and heat transfer are investigated, Re = 70 −150, Pr = 0.7.
References
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Journal ArticleDOI
A laser-Doppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder
TL;DR: In this article, an ensemble-averaged statistics at constant phase of the turbulent near-wake flow (Reynolds number ≈ 21400 around a square cylinder) were obtained from two-component laser-Doppler measurements.
Journal ArticleDOI
Three-dimensional wake transition
TL;DR: In this paper, it is shown that the wake transition regime for a circular cylinder involves two modes of small-scale three-dimensional instability (modes “A” and “B”; Williamson, 1988), depending on the regime of Reynolds number (Re), and their effects on near wake formation.
Journal ArticleDOI
Low-Reynolds-number flow around a square cylinder at incidence: study of blockage, onset of vortex shedding and outlet boundary condition
TL;DR: In this paper, an incompressible SIMPLEC code is used with a non-staggered grid arrangement for the convective terms and the time discretization is implicit and a second-order Crank-Nicolson scheme is employed.
Journal ArticleDOI
Heat and fluid flow across a square cylinder in the two-dimensional laminar flow regime
Atul Sharma,Vinayak Eswaran +1 more
TL;DR: In this paper, the flow structure and heat transfer characteristics of an isolated square cylinder in cross flow are investigated numerically for both steady and unsteady periodic laminar flow in the two-dimensional regime, for Reynolds numbers of 1 to 160 and a Prandtl number of 0.7.
Journal ArticleDOI
Three-dimensional floquet instability of the wake of square cylinder
TL;DR: In this paper, the authors investigated the onset of three-dimensionalality in an otherwise two-dimensional periodic wake of a square cylinder and employed the Floquet stability analysis to extract the different modes of 3D instabilities.
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