Work

Flow-Induced Vibrations of a Square Cylinder in the Combined Steady and Oscillatory Flow

Year: 2025

Type: article

Abstract: The paper presents a two-dimensional RANS–SST k–ω investigation of vortex-induced vibration of a square cylinder with two degrees of freedom under combined steady and oscillatory flow at the Reynolds number of 5000, Keulegan–Carpenter number of 10, mass ratio of 2.5, and zero structural damping. Flow ratio a (steady-to-total velocity) is varied from 0 to 1.0, and the reduced velocity Ur from 2 to 25 to map lock-in regimes, response amplitudes, frequency content, hydrodynamic loads, trajectories, and wake patterns. At low a ≤ 0.4, in-line vibrations dominate at Ur > 5, with double-frequency transverse lock-in peaking near Ur = 5. As a → 1.0, in-line motion diminishes, and single-frequency transverse oscillation prevails, with the maximum transverse displacement up to 0.54D. The mean drag coefficient increases with increasing flow ratio; the fluctuating drag coefficient decreases with increasing a; while the lift coefficient peaks at a = 1, Ur = 2. Wake topology transitions from a mixed vortex shedding towards a 2S pattern, as a → 1.

Source: Journal of Marine Science and Engineering

DOI: 10.3390/jmse13091621

Authors: Henry Francis Annapeh, Victoria Kurushina

Institution: Industrial University of Tyumen

Language: English

Topic: Fluid Dynamics and Vibration Analysis

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $3,137