Strouhal Number


In dimensional analysis, the Strouhal number (St) is a dimensionless number describing oscillating flow mechanisms. The parameter is named after Vincenc Strouhal, a Czech physicist who experimented in 1878 with wires experiencing vortex shedding and singing in the wind. The Strouhal number is an integral part of the fundamentals of fluid mechanics.

Related formulas


StStrouhal number (dimensionless)
fvortex shedding frequency (Hz)
Lcharacteristic length (for example hydraulic diameter, or chord length) (m)
Vvelocity of the fluid (m/s)