Influence of inflow acceleration on the aerodynamic characteristics of a square cylinder

• DOI: 10.1016/j.jweia.2024.105814
• Publication Date: 2024-07-08T05:55:08Z
• Authors: G. Lunghi; S. Brusco; A. Mariotti; G. Piccardo; M.V. Salvetti
• Keywords: Strouhal number; Vortex shedding; Inflow; Wake turbulence

Large-Eddy Simulations were conducted to investigate accelerated flows around a square cylinder. The study explores flow characteristics for Gaussian-type accelerations of the inflow within range Reynolds numbers Re=1.720×104 Re=6.536×104. Three different acceleration intensities same Re have been considered. For all analyzed values, time cells with constant frequency in vortex shedding identified agreement experimental findings Brusco et al. (2022a). temporal behavior vorticity field indicates that packets are shed at these cells. Moving from one cell another, there is discontinuity vortex-shedding mechanism, leading an unsteady but more symmetrical wake and reduction crossflow-force fluctuations. Subsequently, restarts higher frequency. As intensity increases, length constant-frequency decreases. A similar Strouhal number obtained intensities.