Flow induced vibration (FIV) of a pentagonal cylinder with high mass-damping ratio

Masoudi, Esmaeel; Gan, Lian; Sims-Williams, David; Marshall, Adam

Abstract

In this study, fluid structure interactions of a fixed and oscillating pentagonal cylinder are studied using experimental approaches. Specifically, flow induced vibration (FIV) of a pentagonal cylinder is studied with six different incidence angles (α) in a recirculating wind tunnel at fixed mass damping ratios. A series of free oscillation experiments are carried out in order to explore galloping behaviour as well as the lock-in region for vortex induced vibration (VIV). It is found that VIV for a pentagonal cylinder is substantially stronger than for a circular cylinder with a similar mass ratio. VIV maximum amplitude changes non-monotonically with incidence angle, and is smaller for incidences where galloping is dominant. Also, galloping was found to be substantially stronger where the stiffness of the system is lower.

Citation

Masoudi, E., Gan, L., Sims-Williams, D., & Marshall, A. (2025). Flow induced vibration (FIV) of a pentagonal cylinder with high mass-damping ratio. Journal of Fluids and Structures, 133, Article 104267. https://doi.org/10.1016/j.jfluidstructs.2025.104267

• Journal Article Type: Article
• Acceptance Date: Jan 9, 2025
• Online Publication Date: Jan 17, 2025
• Publication Date: 2025-03
• Deposit Date: Jan 9, 2025
• Publicly Available Date: Mar 5, 2025
• Journal: Journal of Fluids and Structures
• Print ISSN: 0889-9746
• Electronic ISSN: 1095-8622
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 133
• Article Number: 104267
• DOI: https://doi.org/10.1016/j.jfluidstructs.2025.104267
• Public URL: https://durham-repository.worktribe.com/output/3328837