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<p>This study presents the computational analysis of flow regimes transitions around two side-by-side square cylinders under the impact of attached upstream splitters. For the current work, we have used lattice Boltzmann method as numerical technique and for numerical simulations an in-house self-written code based on Fortran is used. Focus is laid upon the impact of two influencing parameters, that is, the length of the splitters (SL) and spacing ratio (SR) between cylinders. Both parameters are varied from 1 to 4 times the characteristic length (<i>d</i>) at a fixed value of Reynolds number = 150. Under the impact of these parameters, the flow regimes transition occurred from the flip-flopping to non-synchronized regime and then finally a synchronized flow regime is achieved which is considered as favorable flow regime in case of side-by-side arranged bluff bodies. The introduction of splitter plates is found to have a promising impact in controlling the drag force on both cylinders. Furthermore, results indicate an early transition to synchronized flow regime due to splitters as compared to the case of two side-by-side cylinders without splitters.</p>

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Reduction of drag force for flow around two side-by-side square cylinders through attached upstream splitters

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Hamid Rahman

摘要

This study presents the computational analysis of flow regimes transitions around two side-by-side square cylinders under the impact of attached upstream splitters. For the current work, we have used lattice Boltzmann method as numerical technique and for numerical simulations an in-house self-written code based on Fortran is used. Focus is laid upon the impact of two influencing parameters, that is, the length of the splitters (SL) and spacing ratio (SR) between cylinders. Both parameters are varied from 1 to 4 times the characteristic length (d) at a fixed value of Reynolds number = 150. Under the impact of these parameters, the flow regimes transition occurred from the flip-flopping to non-synchronized regime and then finally a synchronized flow regime is achieved which is considered as favorable flow regime in case of side-by-side arranged bluff bodies. The introduction of splitter plates is found to have a promising impact in controlling the drag force on both cylinders. Furthermore, results indicate an early transition to synchronized flow regime due to splitters as compared to the case of two side-by-side cylinders without splitters.