A Numerical Study for Flow Around Three Square Cylinders in Triangular Arrangement

Rahman, Hamid; Islam, Shams Ul; Abbasi, Waqas Sarwar; Nazeer, Ghazala

doi:10.1007/s40997-019-00283-2

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…Another reason for choosing this grid size is that the values given in Table 3, which agree well with the literature results, are also computed at d � 20. Te domain independence study can be found in our previous work [40].…”

Section: Code Validation Studymentioning

confidence: 97%

Passive Flow Control around Two Side‐by‐Side Square Cylinders Using a Control Plate

Abbasi

Nadeem

Rahman

2023

Mathematical Problems in Engineering

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This article is concerned with the numerical analysis of reduction of fluid forces (drag and lift) and suppression of vortex shedding around two side-by-side square cylinders using the lattice Boltzmann method. For this purpose, a passive flow control methodology is adopted in which a flat plate (termed as the control plate) is placed at the upstream position of cylinders. The gap ratio ( g ) between the cylinders and the plate is varied from 0 to 4 while the height of the control plate is varied from 0.2 to 0.8 at fixed Reynolds number of 150. Different flow patterns are found in this study depending on the gap ratios and different heights of the control plate. These flow patterns are single bluff body flow, flip-flopping flow, and antiphase vortex shedding flow patterns. The narrow gap ratio ( g = 0.5) is found to have more impact in terms of force reduction and flow control as compared to larger gap ratios. This article also shows that the fluid flow parameters such as the mean drag coefficient, the Strouhal number, and rms values of drag and lift coefficients of both cylinders reduce considerably due to the control plate as compared to without the control plate. In this regard, it is found that the mean drag coefficient of upper cylinder reduces upto 45.94%, the Strouhal number of both cylinders reduces upto 18.66%, while a maximum reduction of 83.47% and 95.39% is observed in root-mean-square values of drag and lift coefficients of upper cylinder, respectively. Another important finding of this article is that the control plate does not suppress forces and control flow at all gap ratios and heights of control plate considered in this article. In some cases, the flow-induced forces were found to be increasing as compared to without the control plate, and this generally happened at higher gap ratios.

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Section: Code Validation Studymentioning

confidence: 97%

Passive Flow Control around Two Side‐by‐Side Square Cylinders Using a Control Plate

Abbasi

Nadeem

Rahman

2023

Mathematical Problems in Engineering

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“…They observed symmetric and asymmetric biased flow regimes for three structures at g/D = 1.25. The studies of flow past three structures were also carried out by Rahman et al [ 21 ], Zheng and Alam [ 22 ], Islam et al [ 23 ], Inoue and Suzuki [ 24 ], Kumada et al [ 25 ] and Guillaume and LaRue [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Reduction of fluid forces for flow past side-by-side cylinders using downstream attached splitter plates

et al. 2023

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A two-dimensional numerical simulation is performed to investigate the drag reduction and vortex shedding suppression behind three square cylinders with attached splitter plates in the downstream region at a low Reynolds number (Re = 150). Numerical calculations are carried out using the lattice Boltzmann method. The study is carried out for various values of gap spacing between the cylinders and different splitter plate lengths. The vortices are completely chaotic at very small spacing, as observed. The splitter plates are critical in suppressing shedding and reducing drag on the objects. The splitter plates with lengths greater than two fully control the jet interaction at low spacing values. There is maximum percentage reduction in C D mean for small spacing and the selected largest splitter plate length. Furthermore, systematic investigation reveals that splitter plates significantly suppress the fluctuating lift in addition to drastically reducing the drag.

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“…The flow behind three square cylinders in two different triangular arrangements was investigated numerically by Rahman et al [18]. They reported that the Strouhal number varied between 0.0132 and 0.2003 in both arrangements.…”

Section: Introductionmentioning

confidence: 99%

Computational Examination of Aerodynamics Forces and Evolution of Vortex Shedding of Flow Past Three Square Cylinders at Two Symmetrical Vee Shapes

Fezai¹

2021

CTCSE

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The flow past three square cylinders at two symmetrical vee shapes has been investigated by a finite-volume method numerical technique. The two-dimensional computations have been performed for different Reynolds number (Re) ranging from 1 to 180 in order to consider different flow regimes; the steady, the periodic and the turbulent flow. The validation of the code with the available literature results regarded both the reliability of the computed solutions and the overall resulting efficiency of the methods. Velocity profiles, vorticity contours and integral parameters such as Strouhal number, drag and lift coefficients have been presented and analyzed. Steady and unsteady regimes of flow have been observed by monotonously changing the Re value, leading to the prediction of the critical Reynolds number for each configuration considered. Furthermore, the change in the geometry of the obstacle is found to affect dramatically the emergence of the Hopf bifurcation points. The oscillatory periodic wake is also seen to be influenced by the Strouhal number, which varies with obstacle shape and the Re values. Relevant outcomes of this work are the estimation of the vortex shedding frequencies and the prediction of the best configuration considering the computation of the lift and drag coefficients.

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A Numerical Study for Flow Around Three Square Cylinders in Triangular Arrangement

Cited by 13 publications

References 30 publications

Passive Flow Control around Two Side‐by‐Side Square Cylinders Using a Control Plate

Passive Flow Control around Two Side‐by‐Side Square Cylinders Using a Control Plate

Reduction of fluid forces for flow past side-by-side cylinders using downstream attached splitter plates

Computational Examination of Aerodynamics Forces and Evolution of Vortex Shedding of Flow Past Three Square Cylinders at Two Symmetrical Vee Shapes

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