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<p>Numerical simulations are performed to study the wake control and reduction of the loads (forces) for fluid flowing around three-square cylinders placed side-by-side using lattice Boltzmann method. For controlling the flow, a pair of splitter plates is placed in the wake of cylinders. The Reynolds number is fixed at 200, while the length of the splitter plates is varied from 1 to 5. The dimensionless spacing (<i>G</i>) between the cylinders is fixed at <i>G =</i> 1. Similarly, the distance between the cylinders and plates is also fixed as <i>G</i> = 1. The motivation behind the current work is the fact that the flow around side-by-side cylinders exhibits complexities in the wake structures and random fluctuations in the flow induced drag and lift forces due to the uncontrolled jet flow emerging within the gaps. Keeping in view such chaos and unsteady flows around side-by-side structures, the current work aims to find the optimum conditions for maximum flow control around a triad of square cylinders through coupled splitter plates. Results indicate that the wake displays distinct flow regimes initializing from complexity at smaller lengths of plates which is gradually controlled by plates as their length increases. The current analysis reveals that the statistical parameters like the mean drag coefficient, root-mean-square values of drag and lift coefficients, the Strouhal number as well as the amplitudes of time dependent drag and lift coefficients comprehensively reduce as compared to uncontrolled fluid flow around such triad of cylinders. The control plates are found more effective in reducing the forces on the cylinders placed at upper and lower sides as compared to the central one. Due to placement of the splitter plates, up to 18% reduction is observed in the mean drag coefficient, root mean square values of drag and lift coefficients reduced up to 40.7% and 66% while the Strouhal number reduced up to 14% compared to the cylinders without splitter plates. The reduction trend in forces is found to more likely occur on lower cylinder as compared to the upper ones.</p>

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Flow control around a triad of square cylinders placed in proximity via the splitter plates

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Waqas Sarwar Abbasi,
  • Sumaira Nadeem,
  • Hamid Rahman

摘要

Numerical simulations are performed to study the wake control and reduction of the loads (forces) for fluid flowing around three-square cylinders placed side-by-side using lattice Boltzmann method. For controlling the flow, a pair of splitter plates is placed in the wake of cylinders. The Reynolds number is fixed at 200, while the length of the splitter plates is varied from 1 to 5. The dimensionless spacing (G) between the cylinders is fixed at G = 1. Similarly, the distance between the cylinders and plates is also fixed as G = 1. The motivation behind the current work is the fact that the flow around side-by-side cylinders exhibits complexities in the wake structures and random fluctuations in the flow induced drag and lift forces due to the uncontrolled jet flow emerging within the gaps. Keeping in view such chaos and unsteady flows around side-by-side structures, the current work aims to find the optimum conditions for maximum flow control around a triad of square cylinders through coupled splitter plates. Results indicate that the wake displays distinct flow regimes initializing from complexity at smaller lengths of plates which is gradually controlled by plates as their length increases. The current analysis reveals that the statistical parameters like the mean drag coefficient, root-mean-square values of drag and lift coefficients, the Strouhal number as well as the amplitudes of time dependent drag and lift coefficients comprehensively reduce as compared to uncontrolled fluid flow around such triad of cylinders. The control plates are found more effective in reducing the forces on the cylinders placed at upper and lower sides as compared to the central one. Due to placement of the splitter plates, up to 18% reduction is observed in the mean drag coefficient, root mean square values of drag and lift coefficients reduced up to 40.7% and 66% while the Strouhal number reduced up to 14% compared to the cylinders without splitter plates. The reduction trend in forces is found to more likely occur on lower cylinder as compared to the upper ones.