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For circular cylinders, with Reynolds number greater than 1000, how would the Strouhal number behave?

For circular cylinders, with Reynolds number greater than 1000, how would the Strouhal number behave? Correct Answer Constant at 0.21

The Strouhal Number is a dimensionless value useful for analyzing oscillating unsteady fluid flow dynamics problems.

The Strouhal Number can be expressed as

S = ω L / v                                            

Where,

S = Strouhal Number

ω = oscillation frequency

L= characteristic length

V = flow velocity

For a circular section cylinder this number remains, in a wide range of Reynolds, approximately constant and equal to 0.2. This is an experimental fact.

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