Strouhal number
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The Strouhal Number is a dimensionless parameter describing the oscillating frequency of a flow. Usually it is defined as:
where 
is the frequency of the flow (e.g. vortex shedding frequency), 
is a characteristic length scale of the flow and 
is a characteristic velocity.
The Strouhal Number is a function of the Reynolds Number typically between 20 < Re < 20,000.
