Numerical investigation of wake modes for flow past three tandem cylinders using the multi-relaxation-time lattice Boltzmann method for different gap spacings

Ul-Islam, Shams; Abbasi, Waqas Sarwar; Rahman, Hamid; Naheed, Rizwana

doi:10.1007/s40430-014-0282-4

Cited by 21 publications

(10 citation statements)

References 21 publications

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“…The code for the present problem is validated against experimental and numerical data available in literature. The results obtained from the present study show good agreement with the results obtained from Vamsee et al [12], Igarashi and Suzuki [29], Zdravkovich [31], Islam et al [32], Harichandan and Roy [33], and Abbasi et al [34]. Some concluding points of this study are as follows:…”

Section: Discussionsupporting

confidence: 91%

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Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method

et al. 2020

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Numerical simulations are performed to examine the effect of size of control rods (d1) and spacing ratio (g) on flow around a square rod with upstream and downstream control rods aligned in-line using the lattice Boltzmann method (LBM). The Reynolds number (Re) is fixed at Re = 160, while the spacing between the main rod and control rods is taken in the range 1 ≤ g ≤ 5 and the size of the control rod is varied between 4 and 20. Seven different types of flow mods are observed in this study at different values of g and d1. Variation in force statistics, like mean drag coefficient (Cdmean), Strouhal number (St), root mean square values of drag (Cdrms) and lift coefficients (Clrms), and percentage reduction in mean drag coefficient is discussed in detail. It was examined that vortex shedding completely suppressed at (g, d1) = (1, 12), (2, 12), and (2, 16) where steady flow mode exists. Moreover, it was found that at large gap spacing, where g = 5, the effect of control rods on the main rod vanishes. Due to this strong vortex shedding produced and as a result, maximum value of Cdmean is found at (g, d1) = (5, 8). The negative values of mean drag force are also observed at some gap spacing and size of control rods are due to the effect of thrust. Furthermore, the maximum percentage reduction in Cdmean is 121%, found at (g, d1) = (2, 20).

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Section: Discussionsupporting

confidence: 91%

“…It is clear from the figure that both the drag and lift graphs exhibit periodic behavior. Similarly, two rows vortex street flow mode was also reported by Islam et al [32] for flow over three tandem square rods at g ≥ 5.…”

Section: Two Rows Vortex Street (Trvs) Flow Modesupporting

confidence: 79%

Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method

et al. 2020

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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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“…A detailed numerical simulation about the flow past two and three inline cylinders associated with fluid-structure interaction can be found in references [16][17][18][19][20][21][22][23]. Zdravkovich [16] experimentally examined the different flow patterns and sensitivity of the force coefficients for flow past two inline circular cylinders.…”

Section: Introductionmentioning

confidence: 99%

“…The authors also observed that the flow patterns strongly depended on the reattachment of the separated shear layer from the upstream cylinder. Islam et al [23] numerically examined the flow past three inline square cylinders using the lattice Boltzmann method. They reported steady flow, nearly unsteady flow, sparse Karman vortex street, non-fully developed vortex street in single and double row by systematically increasing g. The authors also reported that g = 3 is critical spacing value.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of different aspect ratios for flow past three inline rectangular cylinders

Islam

Manzoor

Ying

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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In this paper, numerical investigations are carried out to study the effect of aspect ratios (AR = length/height) for flow past three rectangular cylinders aligned inline at different gap spacings (g) using lattice Boltzmann method. The aspect ratio is varied between 0.25 and 3, gap spacing is taken in the range from 0.5 to 7 and the Reynolds number is fixed at 150. With the help of present numerical investigation, it is found that the variation of forces with different AR and g is governed by six distinct flow patterns: (1) shear layer reattachment flow; (2) steady flow; (3) quasi-steady flow; (4) strongly interactive vortex shedding flow; (5) two-row vortex street flow; and (6) critical flow pattern. It is observed that the development of vortices, interferences of the free shear layers and the wake vortices distribution of three cylinders play a vital role in the variation of shedding frequencies and fluid forces. Consequently, the cylinders placed at downstream usually experience serious fluctuating forces due to unsteady wakes generated by the upstream cylinders. Also, the upstream cylinder normally experiences larger mean drag force as compared to the downstream ones. The sudden jumps in mean drag coefficients and Strouhal numbers with their maximum and minimum values are identified, respectively. The upstream and middle cylinders force coefficients strongly affected due to critical aspect ratios at different fixed gap spacings. It is observed that the wake transition at early stages significantly changes by changing the aspect ratios for fixed gap spacings. The results also show that the middle and downstream cylinders experience negative drag force for some aspect ratios and gap spacings. Furthermore, the dependence of the critical gap spacing on the aspect ratios is also discussed.

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Numerical investigation of wake modes for flow past three tandem cylinders using the multi-relaxation-time lattice Boltzmann method for different gap spacings

Cited by 21 publications

References 21 publications

Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method

Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method

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

Numerical investigation of different aspect ratios for flow past three inline rectangular cylinders

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