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Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets

Khujadze, George ; Nguyen van Yen, Romain ; Schneider, Kai ; Oberlack, Martin ; Farge, Marie (2024)
Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets.
In: Journal of Physics: Conference Series, 2011, 318 (2)
doi: 10.26083/tuprints-00020768
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets
Language: English
Date: 6 February 2024
Place of Publication: Darmstadt
Year of primary publication: 2011
Place of primary publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics: Conference Series
Volume of the journal: 318
Issue Number: 2
Collation: 10 Seiten
DOI: 10.26083/tuprints-00020768
Corresponding Links:
Origin: Secondary publication DeepGreen

Turbulent boundary layer data computed by direct numerical simulation are analyzed using orthogonal anisotropic wavelets. The flow fields, originally given on a Chebychev grid, are first interpolated on a locally refined dyadic grid. Then, they are decomposed using a wavelet basis, which accounts for the anisotropy of the flow by using different scales in the wall-normal direction and in the planes parallel to the wall. Thus the vorticity field is decomposed into coherent and incoherent contributions using thresholding of the wavelet coefficients. It is shown that less than 1% of the coefficients retain the coherent structures of the flow, while the majority of the coefficients corresponds to a structureless, i.e., noise-like background flow. Scale-and direction-dependent statistics in wavelet space quantify the flow properties at different wall distances.

Identification Number: Artikel-ID: 022011
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-207687
Additional Information:

13th European Turbulence Conference (ETC13)

Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Exzellenzinitiative > Graduate Schools > Graduate School of Computational Engineering (CE)
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Date Deposited: 06 Feb 2024 09:58
Last Modified: 06 Feb 2024 09:59
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20768
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