Abstract:
The aerodynamic characteristics and flow field of rectangular cylinder with rounded corner are very complex. To further understand the Reynolds number (
Re) effect of rectangular cylinder with rounded corner, the large eddy simulations (LES) of flow around a 4∶1 rectangular cylinder with rounded corner under different
Res are carried out, which are based on the computational fluid dynamics (CFD). The aerodynamic coefficient, Strouhal number (
St), wind pressure coefficient and flow field under different
Res are comprehensively studied. The results indicate that the surface pressure and time-averaged flow field are sensitive to
Re when
Re ≤ 4×10
3; however, they are insensitive to
Re when
Re > 4×10
3. In addition, when
Re ≤ 4×10
3, the root mean square of lift coefficient and the mean drag coefficient increase and then decrease with
Re, and they reach the maximum at
Re = 1×10
3. Nevertheless,
St first increases, then decreases and finally increases, and its maximum and minimum are at
Re = 2×10
3 and 4×10
3, respectively. With the increase of
Re, the recirculation length first decreases and then increases, and the center of the wake vortex moves backward gradually.