Flow-induced vibrations of a square cylinder at different angles of attack: The importance of the in-line vibrations

• DOI: 10.1063/5.0250587
• Publication Date: 2025-02-10T11:15:51Z
• Authors: Boyang Li; Huichao Li; Yongjian Zhong; Baoshou Zhang; Shenfang Li; Junlei Wang; Rui Zhang; Peng Han
• Keywords: Square (algebra); Line (geometry); Vortex-induced vibration

A square cylinder is an ideal geometry for investigating both vortex-induced vibration (VIV) and galloping instabilities. The present work aims to evaluate the significance of in-line freedom on flow-induced vibrations (FIVs) a subjected flow. Numerical simulations were conducted two-degree-of-freedom (2-DOF) one-degree-of-freedom (1-DOF) with different angles attack. mass ratio, which structural divided by displaced fluid mass, set 5, Reynolds number fixed at 200. Detailed comparisons amplitude responses, frequency hydrodynamic characteristics, forces, transitions VIV-galloping, vortex shedding modes 2-DOF one only cross-flow oscillation conducted. Overall, trend 1-DOF similar that cylinder. However, when α between 5° 20°, results show there are two obvious peak regions in response cylinder, while second region not found This indicates considering crucial FIV as can alter responses vibrations.