Influence of shape change on the flow characteristics around the original main structure

Based on the CFD fluid computing platform Fluent calculation software, the three-dimensional flow around a wavy cylindrical structure under Reynolds number Re=3 900 is studied. The main analysis is the wavelength ratio (λ/D m =1.8～5.0) and amplitude ratio (a/D m = 0.05～0.2) The influence of two key parameters on the flow characteristics around the wavy cylinder and the distribution characteristics of the wake field, and the smooth cylinder (UC) calculation results are introduced for comparison, and further reveal its inherent wake control mechanism . The research shows that: there is a strong three-dimensional effect on the characteristics of the wave-shaped cylindrical wake, and the distribution of the flow field characteristics at the node and the saddle is obviously different; The time-averaged velocity distribution in the axial direction shows a strong three-dimensional effect; the pressure distribution along the radial direction of the wave-shaped cylinder also shows a strong three-dimensional effect. Ge