CFD Online Logo CFD Online URL
Home > Wiki > Strouhal number

Strouhal number

From CFD-Wiki

Revision as of 00:18, 20 September 2005 by Discoganya (Talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

The Strouhal Number is a dimensionless parameter describing the oscillating frequency of a flow. Usually it is defined as:

St = \frac{fL}{U}

where f is the frequency of the flow (e.g. vortex shedding frequency), L is a characteristic length scale of the flow and U is a characteristic velocity.

The Strouhal Number is a function of the Reynolds Number typically between 20 < Re < 20,000.

My wiki