| Re range | Strouhal number | |----------|----------------| | < 1e5 | 0.18 | | 1e5 – 3.5e6 | 0.20 | | > 3.5e6 | 0.22 |
Use VLOOKUP or XLOOKUP to adjust ( S_t ) automatically. Create a table for different velocities and headings: wake frequency calculation excel sheet
| Velocity (m/s) | Angle (deg) | Proj. Diameter (m) | f_shed (Hz) | Resonance? | |----------------|-------------|--------------------|-------------|-------------| | 5 | 0 | 0.5 | 2.0 | OK | | 10 | 0 | 0.5 | 4.0 | RESONANCE | | 15 | 30 | 0.5 | 6.0 | OK | | Re range | Strouhal number | |----------|----------------|
1. Theoretical Background When a fluid (wind or water) flows past a cylindrical structure, vortices alternately shed from each side, creating a periodic force. The vortex shedding frequency (( f )) is given by: vortices alternately shed from each side