Effect of Reynolds numbers on flow past four square cylinders in an in-line square configuration for different gap spacings

Abbasi, Waqas Sarwar; Shams-ul-Islam,; Saha, Suvash C.; Gu, Yuantong; Ying, Zhou Chao

doi:10.1007/s12206-013-1121-8

Cited by 33 publications

(20 citation statements)

References 31 publications

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“…In such case the flow characteristics become different from those in the case of single spacing. This interesting feature of fluid structure interaction has also been investigated by many researchers [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Abbasi

Islam

2018

J Braz. Soc. Mech. Sci. Eng.

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Numerical computations are carried out to analyze the transition in flow states around two inline square cylinders under the effect of Reynolds numbers (Re). For this analysis, Re is varied from 1 to 110 at a fixed spacing ratio g = 3.5. The results are presented in the form of vorticity contours, streamline graphs, temporal histories of drag and lift coefficients and power spectrum of lift coefficients. Also the physical parameters like average drag coefficient, Strouhal number and the rootmean-square values of drag and lift coefficients are presented as a function of Re. Three different states of flow are found in this study by systematically varying Re: (a) steady state, (b) quasi-unsteady state, and (c) unsteady state. The points of separation and reattachment of shear layers depend on Re. This study shows that the values of physical parameters strongly depend on flow states and change their behavior when flow mode changes from one state to another. A significant reduction in the values of flow induced forces found due to the presence of two cylinders in the flow field when compared to single cylinder values. The results of the present study are also compared with the available data of other researchers and found to be in good agreement.

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Section: Introductionmentioning

confidence: 99%

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Abbasi

Islam

2018

J Braz. Soc. Mech. Sci. Eng.

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“…Some more studies related to the analysis of flow around three or more square cylinders arranged inline can be found in Refs. [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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In this work, fluid-solid interactions are numerically investigated for flow around three equally/unequally spaced square cylinders using the lattice Boltzmann method. Two major trends of shear layers observed for equal gap spacings between cylinders: (i) without roll up (W), and (ii) with roll up (R). While for unequal gap spacings, four major trends of shear layers observed: (i) without roll up in both gaps (WW), (ii) without rollup in first gap and with roll up in second gap (WR), (iii) with roll up in first gap and without roll up in second gap (RW), and (iv) with roll up in both gaps (RR). g = 3 is found to be the critical equal spacing value. Also g = 1.5 is found to be suitable equal spacing in terms of minimum drag force. While the suitable unequal gap spacing combinations found in this study are (g1, g2) = (1.5, 0.5), (g1, g2) = (3, 0.5) and (g1, g2) = (5, 0.5). Results show that flow induced forces can be suppressed by suitable unequal gap spacing combinations.

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“…Abbasi et al . [ 15 ] examined the effect of Reynolds number on flow past four square cylinders in an inline square configuration and discussed in detail the observed flow patterns. Chatterjee and Biswas [ 16 ] reported the chaotic and synchronous flow patterns at 1 ≤ g ≤ 5 for a fixed Reynolds number of 100.…”

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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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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Effect of Reynolds numbers on flow past four square cylinders in an in-line square configuration for different gap spacings

Cited by 33 publications

References 31 publications

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Numerical investigation of fluid-solid interaction for flow around three square cylinders

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

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