Study on the flow past an origami-inspired cylinder at low Reynolds numbers

This study numerically investigates the three-dimensional wake dynamics of origami-inspired cylinders at low Reynolds numbers. Using parametric modeling, the effects of the fold angle parameter (φ), short-edge orientation angle (β), relative height ratio (h/D), and inflow attack angle (α) on the flow patterns and hydrodynamic forces are systematically analyzed. The results reveal that, compared with a circular cylinder, the origami-inspired configuration exhibits a higher overall Strouhal number (St) and a lower mean drag coefficient when Re > 260, indicating a potential drag-reduction advantage at higher Reynolds numbers. Parametric analysis indicates that the lift coefficient (CL) decreases with increasing φ, while the drag coefficient (CD) peaks at φ = 90°. The β positively regulates lift, and increasing α leads to “U-shaped” variations in both CD and CL. Larger h/D promotes three-dimensional wake transitions. These findings provide new insights into the flow-control potential and aerodynamic optimization of origami-inspired bodies.