Numerical investigation on characteristic flow regions for three staggered stationary circular cylinders

Yan, Weiwei; Wu, Jie; Yang, Shanshan; Wang, Yueshe

doi:10.1016/j.euromechflu.2016.07.006

Cited by 21 publications

(22 citation statements)

References 31 publications

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“…There have been a number of investigations on the wake of two, three, five and row of side-by-side circular [ 2 – 9 ] and square [ 10 – 20 ] cylinders. Bearman and Wadcock [ 2 ] experimentally studied the flow past a pair of circular cylinders.…”

Section: Introductionmentioning

confidence: 99%

“…Yan et al . [ 9 ] experimentally and numerically studied the characteristics of flow around three staggered circular cylinders using the multiple-relaxation-time lattice Boltzmann method (MRT-LBM). They found the steady and unsteady flow regions behind the upstream cylinder by varying the gap spacing between the cylinders from 1 to 10 at a fixed Reynolds number (R e = 200).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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A two-dimensional numerical study of flow across rows of identical square cylinders arranged in staggered fashion is carried out. This study will unreveal complex flow physics depending upon the Reynolds number (Re) and gap spacing (g) between the cylinders. The combined effect of Reynolds number and gap spacing on the flow physics around staggered rows of cylinders are numerically studied for 20 ≤ Re ≤ 140 and 1 ≤ g ≤ 6. We use the lattice Boltzmann method for numerical computations. It is found that with increase in gap spacing between the cylinders the critical Reynolds number for the onset of vortex shedding also increases. We observed a strong effect of Reynolds number at g = 2 and 4. Secondary cylinder interaction frequency disappears for large Reynolds number at g = 6 and 5 and the flow around cylinders are fully dominated by the primary vortex shedding frequency. This ensures that at large gap spacing with an increase in the Reynolds number the wakes interaction between and behind the cylinders is weaken. Furthermore, it also ensures that the wake interaction behind the cylinders is strongly influenced by the jets in the gap spacing between the cylinders. We also found that g = 2 is the critical gap spacing for flow across rows of staggered square cylinders for the considered range of Reynolds number. Depending on the Reynolds number we observed; synchronous, quasi-periodic-I, quasi-periodic-II, and chaotic flow patterns. In synchronous flow pattern, an in-phase and anti-phase characteristics of consecutive cylinders has been observed. The important physical parameters are also analyzed and discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…The first arrangement is the same as that of Yan et al. 23 that the unsteadiness of gap flow is suppressed at all Reynolds numbers. It is further observed that the wake flow after the downstream cylinder can still be stabilized by the two upstream cylinders at 103 ≤ Re ≤ 175.…”

Section: Introductionmentioning

confidence: 99%

“…Yan et al. 23 studied the flow across three circular cylinders positioned in a triangular configuration, i.e., one upstream and two downstream ones, at ( D , T ) = (3, 1–10) and Re = 200. The gap flow is steady at 1 ≤ T / D ≤ 1.2 and 2.5 ≤ T / D ≤ 3.1 where the vortex shedding after the upstream cylinder is greatly suppressed; the flow becomes unsteady at 1.3 ≤ T / D ≤ 2.4 and 3.2 ≤ T / D ≤ 10 where the temporal variations of forces are irregular and the wake flow is disordered due to strong wake interaction.…”

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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“…Yan et al [5], Yang et al [6] investigated three cylinders in a staggered arrangement at Re = 200 with laser-induced fluorescence flow visualization and lattice Boltzmann numerical method. Two diverse flow characteristic steady (1 ≤ / ≤ 1.2 and 2.5 ≤ / ≤ 3.1) and unsteady flow (1.3 ≤ / ≤ 2.4 and 3.2 ≤ / ≤ 10) were found.…”

Section: Introductionmentioning

confidence: 99%

Spectral Element Numerical Investigation of Flow between Three Cylinders in an Equilateral‐Triangular Arrangement with Different Spacing Distances

Bao

Qin

et al. 2018

Shock and Vibration

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Two-dimensional incompressible Navier-Stokes equations are numerically solved using the high resolution spectral element method at Reynolds number 200. The flow between three cylinders in an equilateral-triangular arrangement is investigated. The center-to-center spacing distance ratio between two circular cylinders is varied from 1.5 to 12. Present numerical results show that the flow patterns and force characteristics are the result of the combined effects of Reynolds number, spacing distance, configuration arrangement, and incident angle. For the small spacing distance ratio of 1.5, the well-known biased flow phenomenon in the gap of downstream cylinders is found. And the biased flow is bistable in our study but not monostable. A small spacing distance means lower Strouhal number, drag, and root-mean-square lift coefficients. In the medium spacing distance ratio of 4.0, the suppressed effect of vortex shedding for the presence of the side-by-side downstream cylinders disappeared. Mean drag coefficients of downstream cylinders are basically identical to the value of flow past around a single circular cylinder. For the large spacing distance ratio of 8.0, the effects between three cylinders basically disappeared. The mean drag and lift coefficients, root-mean-square lift coefficients, and Strouhal number of three cylinders are essentially equivalent to those values of a single circular cylinder.

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Numerical investigation on characteristic flow regions for three staggered stationary circular cylinders

Cited by 21 publications

References 31 publications

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

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

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

Spectral Element Numerical Investigation of Flow between Three Cylinders in an Equilateral‐Triangular Arrangement with Different Spacing Distances

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