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The airflow around a cylindrical object holds significant engineering applications and remains a prominent topic in aerodynamics research. The circular cylinder experiences substantial dynamic drags due to flow separation. The Ansys Fluent® was employed to analyze the aerodynamic forces on the main cylinder and its interaction within a 2D unsteady flow. The main cylinder investigation has a D = 60 mm diameter tandem with a d/D = 0.125 cylinder of the D-65° type. The distance between the central points of both cylinders was s/D = 1.375. The Reynolds number was Re = 5.3 × 104 with a U∞ = 14 m/s velocity. The simulation employed the transition k-kl-ω (3 eqn) turbulence model. The study revealed that tandem cylinders exhibit superior aerodynamic performance by comparing measurement parameters for single and tandem cylinders. One key parameter investigated was the coefficient of pressure (CP), which indicates the extent of separation delay around the central cylinder. The result presented within the lift coefficient (CL) decreased by 15%, the coefficient of drag (CD) reduced by 46.95%, and the pressure and wind speed contours indicated delayed separation and diminished pressure drag.

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The Shear Layer of D-65° Type Bluff Body in Effect of Main Cylinder as Passive Control Flow Modification: A Numerical Analysis

  • 会议论文

  • 发表日期：

    2025年

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  • Gunawan Sakti,
  • Anisah Nurul Izzah,
  • Erwhin Irmawan,
  • Hadi Prajitno,
  • Sukahir

摘要

The airflow around a cylindrical object holds significant engineering applications and remains a prominent topic in aerodynamics research. The circular cylinder experiences substantial dynamic drags due to flow separation. The Ansys Fluent® was employed to analyze the aerodynamic forces on the main cylinder and its interaction within a 2D unsteady flow. The main cylinder investigation has a D = 60 mm diameter tandem with a d/D = 0.125 cylinder of the D-65° type. The distance between the central points of both cylinders was s/D = 1.375. The Reynolds number was Re = 5.3 × 104 with a U∞ = 14 m/s velocity. The simulation employed the transition k-kl-ω (3 eqn) turbulence model. The study revealed that tandem cylinders exhibit superior aerodynamic performance by comparing measurement parameters for single and tandem cylinders. One key parameter investigated was the coefficient of pressure (CP), which indicates the extent of separation delay around the central cylinder. The result presented within the lift coefficient (CL) decreased by 15%, the coefficient of drag (CD) reduced by 46.95%, and the pressure and wind speed contours indicated delayed separation and diminished pressure drag.