Abstract: This study explores the characteristics of cylindrical winding flow at varying axis ratios (AR) within subcritical Reynolds numbers. We examine the flow’s lift coefficient, drag coefficient, and St at critical Reynolds numbers of Re=3.9×10³, 5.0×10³, 6.0×10³, 8.0×10³, and 10.0×10³, with AR ranging from 0.1 to 1.6. We analyze the causes of flow characteristics by examining the vorticity cloud map and pressure coefficient distribution. The findings indicate that at subcritical Reynolds numbers, maximum lift coefficient CL.m varies with different Reynolds numbers, displaying a trend of initial increase followed by a decrease as AR increases, peaking at AR = 0.7. The trend in St numbers across various Reynolds numbers is consistently upward. The mean drag coefficient exhibits two distinct trends at a critical point when AR = 0.7. These results offer valuable insights for the optimal design of devices utilizing piezoelectric configurations.

Key words: ?ow around a cylinder, long short axis ratio, subcritical Reynolds number, characteristics of ?ow around a cylinder