NUMERICAL SIMULATION OF VORTEX-INDUCED VIBRATIONS OF TWO TANDEM CIRCULAR STRUCTURES IN OSCILLATORY FLOW
Henry Francis Annapeh,
Victoria Kurushina
Abstract: This study investigates vortex-induced vibration (VIV) of two tandem circular cylinders with two degrees of freedom (2DOF) under a pure oscillatory flow. Numerical simulations are performed using a detached eddy simulation solver with the k-ω SST turbulence model, and the results are validated against existing data. The maximum transverse amplitude occurs at a reduced velocity of 10, coinciding with the lock-in regime, while the single isolated cylinder shows a higher amplitude than the tandem setup. Streamwise displacement amplitude exceeds 2.5D for the considered cases. Frequency analysis reveals mode transitions from double to single-frequency modes as the reduced velocity increases. XY trajectory patterns vary with velocity, showing infinity (∞), arc-like, O-shape, and net-like forms. This study enhances understanding of VIV in tandem cylinders and provides insights for engineering applications.
Keywords: Vortex-induced vibration, VIV, Oscillatory flow, Tandem cylinders, Two degree-of-freedom structure
DOI: 10.24874/PES08.01.001
Recieved: 13.03.2025 Revised: 26.06.2025 Accepted: 17.07.2025
UDC:
Reads: 898 
