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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.

Subjects: Noise & Vibration Physics