Numerical Investigation on Galloping Response of the Semi-Arc Cylindrical Structure

The galloping responses of a semi-arc cylindrical structure inspired by the curved leaf are investigated numerically over a Reynolds numbers range of 0.8 × 10⁴ to 5.6 × 10⁴. A circular cylinder is used as the reference case, denoted as T₀, while the bio-inspired cylinder is denoted as T₁. Compared with the maximum normalized transverse displacement of T₀, it increases by 145.8% for T₁. And compared with the maximum normalized in-line displacement of T₀, it increases by 240.6% for T₁. In the high Reynolds numbers region, the normalized vortex-shedding frequency of T₁ remains around 1.0, indicating sustained lock-in behavior, with a broader lock-in range than T₀. Moreover, the hydrodynamic damping of T₀ is positive, while that of T₁ is negative, demonstrating a pronounced galloping response for the bioinspired cylinder. These findings provide valuable insights for the engineering design of marine renewable energy devices.