Strouhal number (related to Reduced Frequency)


In dimensional analysis, the Strouhal number (St) is a dimensionless number describing oscillating flow mechanisms. In certain cases like heaving (plunging) flight, the characteristic length at Strouhal formula is the amplitude of oscillation and can be used to present a distinction between Strouhal number and Reduced Frequency.

Related formulas


StStrouhal number (dimensionless)
kThe reduced frequency (1/s)
aAmplitude of the heaving oscillation. (m)
cVelocity (m/s)