Strouhal number

From Glossary of Meteorology
Revision as of 19:06, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == Strouhal number == </div> <div class="definition"><div class="short_definition">A [[nondime...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)



Strouhal number

A nondimensional number occurring in the study of periodic or quasiperiodic variations in the wake of objects immersed in a fluid stream.

The phenomena are due to the more or less regular formation of vortices or vortex streets in the wake (especially at Reynolds numbers around 100 in the case of circular cylinders):
ams2001glos-Se77
where n is a frequency, D a representative length, and U a representative velocity of the stream. Common examples are aeolian sounds such as those produced by electric power or telephone lines in a wind.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.