Influence of surface roughness on the wake structure of a circular cylinder at Reynolds number 5×10³ to 12×10³
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F22%3A00559027" target="_blank" >RIV/61388998:_____/22:00559027 - isvavai.cz</a>
Alternative codes found
RIV/68378297:_____/22:00559027 RIV/49777513:23210/22:43966464
Result on the web
<a href="https://doi.org/10.1016/j.euromechflu.2022.06.003" target="_blank" >https://doi.org/10.1016/j.euromechflu.2022.06.003</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.euromechflu.2022.06.003" target="_blank" >10.1016/j.euromechflu.2022.06.003</a>
Alternative languages
Result language
angličtina
Original language name
Influence of surface roughness on the wake structure of a circular cylinder at Reynolds number 5×10³ to 12×10³
Original language description
The flow around roughened circular cylinders and the wake behind them were studied in a wind tunnel flow using the Particle Image Velocimetry (PIV) method. The Reynolds number ranged from 5140 to 11800, and the real diameter of the cylinders including surface roughness ranged from 15.06 to 17.34 mm. The flow properties and forces around the roughened cylinders was evaluated by means of Strouhal number and coefficient of drag. The wake was analysed by means of mean velocities along the cylinder centreline, its width and the Proper Orthogonal Decomposition (POD) method. The addednsurface roughness was found to decrease the wake length and increase the wake width at lower Reynolds numbers. At higher Reynolds numbers, the added surface roughness did not decrease the wake length, but did increase the wake width, although with less effect. The POD analysis showed changes in the higher modes of the flow. The kinetic energy of the first two modes covers up to 50% of the total kinetic energy - the first two modes in the case of the smooth cylinder have the lowest kinetic energy, whereas the first two modes in the case of the roughest cylinder have the highest kinetic energy. The similarity between the POD modes of the smooth and roughened cylinders might be due the fact that the actual Reynolds number range was below the transitional one.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20302 - Applied mechanics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Journal of Mechanics B-Fluids
ISSN
0997-7546
e-ISSN
1873-7390
Volume of the periodical
96
Issue of the periodical within the volume
November-December
Country of publishing house
FR - FRANCE
Number of pages
11
Pages from-to
15-25
UT code for WoS article
000827411200002
EID of the result in the Scopus database
2-s2.0-85133278525