Strouhal Number

A dimensionless unit.

where
S = Strouhal Number
f = frequency [Hz]
D = hydraulic dimension [m]
V = velocity [ms-1]

Flow-acoustic coupling may be exhibited at a strouhal number of 0.25, 0.5, 0.75,....

See also: Aerodynamic Noise, Froude Number, Reynolds Number.

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Subjects: Noise & Vibration Physics