Transitions in the flow patterns and aerodynamic characteristics of the flow around staggered rows of cylinders

Islam, Saiful; Nazeer, Ghazala; Ying, Zhou Chao; Islam, Z.; Manzoor, Raheela

doi:10.1371/journal.pone.0184169

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…They revealed that the critical Reynolds number above which the vortex shedding occurs increases with increase in gap spacing between the cylinders. This conclusion was also drawn by Islam et al [11]. They also observed that the Reynolds number have substantial effect on the flow characteristics especially at g = 4 and 2.…”

Section: Introductionsupporting

confidence: 80%

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

Fezai,

oueslati,

Ben-Beya

2024

Preprint

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Two-dimensional numerical investigation is conducted for incompressible fluid flow around staggered square cylinders at different arrangements. The in-house code is firstly validated for flow around a single square cylinder by comparing the results with results present in literature and fair agreement is obtained. The calculations are carried out for several values of Reynolds numbers (Re) ranging from 1 to 120. Aerodynamic features, involving the lift (CL) and drag (CD) coefficients, are predicted and analyzed for three arrangements. Besides, the physical parameters and the flow pattern in the wake are presented by varying the Reynolds number. Sensitivity of the CL and CD values to the change in the arrangement of the square cylinders is analyzed. The numerical outcomes of the present study demonstrate that changing the arrangements of cylinders dramatically the fluctuation of the lift and drag coefficients values relatively to each square cylinder. Moreover, computation analysis reveals that the CD and CL evolutions depend significantly on the different cylinder combinations and the variation of Reynolds number as well.

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Section: Introductionsupporting

confidence: 80%

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

Fezai,

oueslati,

Ben-Beya

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The wake vortices are not clearly visible in the far-wake region for T < 2, and secondary cylinder interaction frequency originates which is not observed at large D . 21 The same physical model is investigated by Chatterjee and Gupta 22 with consideration of forced convection heat transfer. They found that there is no shedding between the rows of cylinders at small D , and the flow is chaotic at small T .…”

Section: Introductionmentioning

confidence: 99%

Quantification of wake unsteadiness for low-Re flow across two staggered cylinders

Zhang

Zhu

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work performs a numerical investigation on the two-dimensional flow across two circular cylinders in staggered arrangement at Re = 100. The seaparting distances between the centers of the cylinders are D/ d = 4–10 with Δ D/ d = 2 and T/ d = 0.0–2.0 with Δ T/ d = 0.5 in the streamwise and transverse directions, respectively, in which d is the cylinder diameter. Although the low- Re flow across staggered cylinders has been studied in a number of works, the authors mainly concerned about the identification and transition of various flow patterns. In this work, our objective is to quantitatively reveal the characteristics of flow unsteadiness as affected by the two separating distances. The flow unsteadiness is assessed from several aspects, including the spatial distributions and temporal variations of instantaneous flow patterns, fluctuating characteristic quantities, and fluctuating flow in the gap and in the near- and far-wake regions. To investigate the inherent instability of the flow, the global linear stability and sensitivity analysis is further carried out to demonstrate the unstable mode of perturbation growth and the critical flow patterns that destabilize the flow. The numerical results reveal that the wake flow between the two centerlines and beside the upstream cylinder is the most intensely perturbed. The flow around the downstream cylinder exhibits great fluctuation as perturbed by the destabilized shear layer of the upstream cylinder. The flow downstream of both cylinders shows multiple peak fluctuation of velocity because of the complex interactions between the destabilized shear layer and the wake vortices, resulting in the bidirectional transverse propagation of fluctuation. The stability analysis demonstrates that the unstable mode of perturbation growth is more significant in the far-wake region as the two cylinders are placed in proximity; the sensitivity analysis shows that the gap flow is crucial for the flow destabilization at small D, while the wake flow of cylinder- B is more significant for large D.

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Flow around an array of four equispaced square cylinders

Zhang

Chen

Zhou

et al. 2019

Applied Ocean Research

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Transitions in the flow patterns and aerodynamic characteristics of the flow around staggered rows of cylinders

Cited by 7 publications

References 33 publications

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

Quantification of wake unsteadiness for low-Re flow across two staggered cylinders

Flow around an array of four equispaced square cylinders

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