Estimate of Strouhal and Reynolds numbers for swimming penguins
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10436022" target="_blank" >RIV/00216208:11320/21:10436022 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=DhPYhkQpSa" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=DhPYhkQpSa</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jav.02886" target="_blank" >10.1111/jav.02886</a>
Alternative languages
Result language
angličtina
Original language name
Estimate of Strouhal and Reynolds numbers for swimming penguins
Original language description
Propulsion performance of swimming and flying animals is often evaluated by using dimensionless numbers, such as the Strouhal and Reynolds numbers. They have been shown to allow a better understanding of locomotion efficiency, using relatively simple approaches and avoiding overly complex computational models. Specifically, it has been reported that efficient propulsion is more likely to occur when Strouhal number values - estimated from propulsive frequencies and amplitudes - are within a relatively narrow range, depending on the corresponding Reynolds number, broadly expressing the fluid resistance to the animal motion. We have estimated both Strouhal and Reynolds numbers for seven species of penguins after analysing relevant kinematic data taken from the literature. The obtained values neatly indicate that, as expected, penguins employ efficient propulsion mechanisms. Additionally, by comparing these values with those for alcids - seabirds that can also fly - we have found that penguins swim at least as efficiently as alcids. However, we have also found that the swimming number - proportional to the product of Strouhal and Reynolds numbers - neatly correlates to the diving abilities of the considered species and apparently indicates, in a straightforward hierarchical manner, the gains in diving due to the loss of flying abilities. Within the penguin species, a clear correlation is also observed between diving performance and drag coefficient values.
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
10613 - Zoology
Result continuities
Project
<a href="/en/project/GA19-00939S" target="_blank" >GA19-00939S: Dynamics of large vortices in quantum turbulence</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Avian Biology
ISSN
0908-8857
e-ISSN
—
Volume of the periodical
2021
Issue of the periodical within the volume
2021
Country of publishing house
DK - DENMARK
Number of pages
6
Pages from-to
e02886
UT code for WoS article
000730466000001
EID of the result in the Scopus database
2-s2.0-85121370243