Fig. 1. [in Chinese]

Fig. 2. [in Chinese]

Fig. 3. [in Chinese]

Fig. 4. [in Chinese]

Fig. 5. [in Chinese]

Fig. 6. Streamlines for the equal tandem square cylinders and variable sized tandem square cylinders at = 2等截面和变截面下串列双方柱绕流= 2的流线图

Fig. 7. Velocity contours for the equal tandem square cylinders and variable sized tandem square cylinders at = 2等截面和变截面串列双方柱绕流= 2的速度云图

Fig. 8. Comparison of average velocity amplitudes along the boundary region width at the centerline of the downstream cylinder for the equal tandem square cylinders and variable sized tandem square cylinders at = 2= 2时等截面和变截面串列双方柱绕流在下游方柱中线处沿边界区域宽度方向的平均速度幅值对比

Fig. 9. [in Chinese]

Fig. 10. [in Chinese]

Fig. 11. Comparison of the time history of the lift coefficients on the downstream cylinder for the equal tandem square cylinders and variable sized tandem square cylinders at = 7等截面和变截面串列双方柱绕流的下游方柱升力系数的时历曲线对比图（= 7）