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<p>This study addresses the critical challenge of mitigating vortex-induced vibrations (VIV), a phenomenon that compromises the structural stability of chimneys, towers, cables, high-rise supports, bridges, and offshore installations. The objective was to experimentally evaluate the performance of helical strakes with varying pitch and diameter ratios as passive flow control devices for suppressing VIV. Using a 64-channel simultaneous pressure scanner, pressure data were collected across the surface of a cylindrical model equipped with helical strakes featuring circular cross-sections. The strakes were tested with pitch ratios of 0.5, 1, and 2 and diameter ratios of 0.03, 0.04, 0.1, and 0.13. The results demonstrate that helical strakes effectively disrupt unsteady vortex shedding, leading to significant reductions in aerodynamic drag and VIV. These findings highlight the efficacy of helical strakes in enhancing the stability and durability of structures exposed to unsteady fluid flows. The study offers practical design insights for engineers and researchers seeking to optimize structural resilience in dynamic environments.</p>

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Aerodynamic and vortex-induced vibration suppression using helical strakes on cylindrical structures

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Ranga Srinivas Gokul,
  • U. Rohinth,
  • S. Abhishek,
  • E. Karthik Vel,
  • Amjad Ali Pasha,
  • K. Kamahshi Priya,
  • Nadaraja Pillai

摘要

This study addresses the critical challenge of mitigating vortex-induced vibrations (VIV), a phenomenon that compromises the structural stability of chimneys, towers, cables, high-rise supports, bridges, and offshore installations. The objective was to experimentally evaluate the performance of helical strakes with varying pitch and diameter ratios as passive flow control devices for suppressing VIV. Using a 64-channel simultaneous pressure scanner, pressure data were collected across the surface of a cylindrical model equipped with helical strakes featuring circular cross-sections. The strakes were tested with pitch ratios of 0.5, 1, and 2 and diameter ratios of 0.03, 0.04, 0.1, and 0.13. The results demonstrate that helical strakes effectively disrupt unsteady vortex shedding, leading to significant reductions in aerodynamic drag and VIV. These findings highlight the efficacy of helical strakes in enhancing the stability and durability of structures exposed to unsteady fluid flows. The study offers practical design insights for engineers and researchers seeking to optimize structural resilience in dynamic environments.