Instantaneous and Time-Averaged Flow Structure around Two Heated Square Cylinders in the Laminar Flow Regime

Etminan, Amin; Barzegar, Abazar

doi:10.4028/www.scientific.net/amm.110-116.2896

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Based on this figure, the dimensionless height of the domain is 20; upstream distance is 8.5 and downstream distance is 20. These constant values are suggested by several reputable studies such as [16][17][18][19]. The inlet X-velocity component of 1.0 is applied to the entrance while the fully developed boundary condition is employed at flow output as well.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Laminar Vortex-shedding Flow Around a very Slender and Rectangular Bluff Body

Etminan¹,

Bodaghkhani²,

Muzychka³

2020

Progress in Canadian Mechanical Engineering. Volume 3

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In the present study, the numerical results of flow and heat transfer structure around a very slender bluff body with a rectangular cross-sectional area are investigated in detail. The Reynolds number is considered so low that the flow presumably is laminar. Reynolds number, Prandtl number, aspect ratio, and the angle of incidence are assumed to be 100, 0.71, 0.1, and 45 degrees respectively. A finite volume method using the SIMPLEC algorithm and nonstaggered grid is employed for the simulation in the twodimensional and incompressible flow regime. The studies of spatial resolution and grid independency are carried out as well. Furthermore, the instantaneous variations of flow parameters are provided and discussed thoroughly. The global quantities including pressure and viscous drag and lift coefficients, the Root Mean Square (RMS) of drag and lift, and Strouhal number are also computed. The simulations reveal that the angle of incidence of the bluff body relocates the stagnation point from the centre to a point at the one-fifth of the frontal side. An acceptable verification has been observed by making a comparison between the provided results and available data in the literature.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Laminar Vortex-shedding Flow Around a very Slender and Rectangular Bluff Body

Etminan¹,

Bodaghkhani²,

Muzychka³

2020

Progress in Canadian Mechanical Engineering. Volume 3

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show abstract

Dynamic mode decomposition analysis of the two-dimensional flow past two transversely in-phase oscillating cylinders in a tandem arrangement

et al. 2022

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The flow through tandem square cylinders was investigated at a Reynolds number of 100 for oscillation amplitudes A = 0.1 D to 0.7 D and gaps L = 2.0 D, 5.0 D, and 6.0 D, where D is the width of the cylinders. A moving reference frame method combined with the spectral/hp element method was employed to simulate the two-dimensional flow in the lock-in regime. Fluid forces, vorticity fields, power spectrum density, and pressure distribution were first investigated. Since surface pressure is directly connected with fluid forces, pressure and velocity field were synchronously analyzed by employing optimal dynamic mode decomposition. An underlying link between fluid forces and coherence modes was then uncovered. The results reveal that the move-induced forces and flow structures strongly depend on gaps and amplitudes in the lock-in regime. With respect to the dynamic mode decomposition analysis, odd-order modes contribute to lift forces, while even-order modes result in drag forces. The flow structures are dominated by at most three modes; as the amplitude increases, the high-order mode energy increases, coinciding with corresponding power spectrum density results of forces. Typical 2S, 2P, and C(2S) wakes were observed for various gaps and two representative amplitudes ( A/D = 0 and 0.7), and their dominant modes show distinctive differences that lead to different local pressure shapes on the cylinders. It is the combined effects of local mode shape and global mode energy that account for the change in fluid forces for various gaps and two oscillating amplitudes.

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Numerical Simulation of Laminar Vortex-Shedding Flow around a very Slender and Rectangular Bluff Body

Etminan¹,

Bodaghkhani²,

Muzychka³

2020

JFFHMT

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Instantaneous and Time-Averaged Flow Structure around Two Heated Square Cylinders in the Laminar Flow Regime

Cited by 3 publications

References 13 publications

Numerical Simulation of Laminar Vortex-shedding Flow Around a very Slender and Rectangular Bluff Body

Numerical Simulation of Laminar Vortex-shedding Flow Around a very Slender and Rectangular Bluff Body

Dynamic mode decomposition analysis of the two-dimensional flow past two transversely in-phase oscillating cylinders in a tandem arrangement

Numerical Simulation of Laminar Vortex-Shedding Flow around a very Slender and Rectangular Bluff Body

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