Convergence of POD modes for cylinder wake flow
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F24%3A00584697" target="_blank" >RIV/61388998:_____/24:00584697 - isvavai.cz</a>
Result on the web
<a href="http://www2.it.cas.cz/fm/im/im/proceeding/2024/9" target="_blank" >http://www2.it.cas.cz/fm/im/im/proceeding/2024/9</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.14311/TPFM.2024.009" target="_blank" >10.14311/TPFM.2024.009</a>
Alternative languages
Result language
angličtina
Original language name
Convergence of POD modes for cylinder wake flow
Original language description
Proper orthogonal decomposition (POD) is a popular technique for both flow analysis and model order reduction. However, its applicability is strongly dependent on the amount of inputndata. In the present contribution, we investigate the convergence of numerical POD modes for the canonical case of turbulent flow in the wake behind a circular cylinder. In particular, thencylinder placed at a crossflow at Reynolds number of 4815 was simulated using detached eddy simulation (DES) with sufficient mesh resolution to achieve a large eddy simulation (LES) andndirect numerical simulation (DNS) blend in the region of interest located directly behind the examined cylinder. The convergence of POD modes with respect to (i) the number of temporalnsnapshots used, (ii) the enforcement of the assumed symmetries, and (iii) spatial resolution of the CFD results was examined. Only the first eleven modes can be assumed converged whennusing standard POD and 12000 snapshots sampled at 2 kHz. However, the results may be significantly improved by enforcing symmetries in the data, which enables to converge evennthe fifteenth mode with a significantly lower number of snapshots. Finally, simple norm-based techniques did not proved to be a sufficient tool for POD toposes comparison. Therefore thenquantitative evaluation of the modes convergence remains an open question.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10102 - Applied mathematics
Result continuities
Project
<a href="/en/project/TN02000069" target="_blank" >TN02000069: National centre of competence for Materials, Advanced Technologies, Coatings and their Applications</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Topical Problems of Fluid Mechanics
ISBN
978-80-87012-88-8
ISSN
2336-5781
e-ISSN
—
Number of pages
8
Pages from-to
61-68
Publisher name
Institute of Thermomechanics AS CR, v. v. i.
Place of publication
Prague
Event location
Prague
Event date
Feb 21, 2024
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
001242655400009