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This numerical study examines the unsteady wake control of a two-dimensional square cylinder using a hinged splitter plate at Re = 100. One end of the plate is hinged at the center of the rear side of the cylinder. The other end undergoes a pitching motion with various dimensionless frequencies (St = 0.1–0.4), amplitude ( \(\theta_{max}\)  = 10°–20°), and length (L/D = 0.5–2.0), where D indicates the cylinder’s side length. The pitching parameters influence wake flow patterns that are categorized as Type-1A, Type-1B, Type-2A, Type-2B, Type-3A, and Type-3B. A regular vortex shedding takes place in the cylinder’s wake for Type-1A and Type-1B. A parallel vortex street is found in Type-2A and Type-2B, with Type-2B yielding a more stable wake. A series of vortex pairs is observed in the case of Type-3A and Type-3B. It is found that the Type-2A and Type-2B regimes are associated with the lower range of drag on the cylinder-plate setup. In comparison to a cylinder with no plate, the maximum drag reduction of the cylinder-plate setup is 33.6%, obtained for \(\theta_{max}\)  = 10°, L/D = 2.0, and St = 0.4. Furthermore, this study evaluates the effectiveness of drag reduction ( \(\zeta\) ), which reveals that the \(\zeta\) is affected by the change in power consumption as the pitching parameters are varied.

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A Numerical Investigation on the Wake Regime Control and Drag Reduction of a Square Cylinder Using a Hinged Splitter Plate

  • 会议论文

  • 发表日期：

    2026年

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  • Bibhas Chand,
  • Prabir Sikdar,
  • Sunil Manohar Dash

摘要

This numerical study examines the unsteady wake control of a two-dimensional square cylinder using a hinged splitter plate at Re = 100. One end of the plate is hinged at the center of the rear side of the cylinder. The other end undergoes a pitching motion with various dimensionless frequencies (St = 0.1–0.4), amplitude ( \(\theta_{max}\)  = 10°–20°), and length (L/D = 0.5–2.0), where D indicates the cylinder’s side length. The pitching parameters influence wake flow patterns that are categorized as Type-1A, Type-1B, Type-2A, Type-2B, Type-3A, and Type-3B. A regular vortex shedding takes place in the cylinder’s wake for Type-1A and Type-1B. A parallel vortex street is found in Type-2A and Type-2B, with Type-2B yielding a more stable wake. A series of vortex pairs is observed in the case of Type-3A and Type-3B. It is found that the Type-2A and Type-2B regimes are associated with the lower range of drag on the cylinder-plate setup. In comparison to a cylinder with no plate, the maximum drag reduction of the cylinder-plate setup is 33.6%, obtained for \(\theta_{max}\)  = 10°, L/D = 2.0, and St = 0.4. Furthermore, this study evaluates the effectiveness of drag reduction ( \(\zeta\) ), which reveals that the \(\zeta\) is affected by the change in power consumption as the pitching parameters are varied.