On the extraordinary effect of Gyroid-based porous trailing edge in eliminating vortex shedding and induced vibration.

Gyroids are porous structures, member of triply periodic minimal surfaces, known for their intricate, non-self-intersecting geometry. In this study, we introduce a novel application of gyroid-structured extensions for flow control. Attached to a hydrofoil trailing edge, the gyroid extension suppresses the formation of Karman vortices, thereby eliminating vortex-induced vibration (VIV). Notably, the hydro-elastic resonance lock-in is completely removed and the vibrations are reduced up to 99.5%. Wake velocity measurements demonstrate that the characteristic Strouhal frequency peak linked to vortex shedding disappears with the gyroid insert, while the hydrofoil's lift and drag remain unchanged. In our presentation we will show how the gyroid affects the flow and disrupt coherent vortex formation. These results were obtained on a blunt NACA 0009 hydrofoil (100 mm chord, 150 mm span) tested at high Reynolds numbers (Re = 0.6×10⁶ to 2×10⁶).