Khujadze, George ; Nguyen van yen, Romain ; Schneider, Kai ; Oberlack, Martin ; Farge, Marie (2011)
Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets.
In: Journal of Physics: Conference Series, 318 (2)
doi: 10.1088/1742-6596/318/2/022011
Artikel, Bibliographie
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Kurzbeschreibung (Abstract)
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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2011 |
| Autor(en): | Khujadze, George ; Nguyen van yen, Romain ; Schneider, Kai ; Oberlack, Martin ; Farge, Marie |
| Art des Eintrags: | Bibliographie |
| Titel: | Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets |
| Sprache: | Englisch |
| Publikationsjahr: | 2011 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Conference Series |
| Jahrgang/Volume einer Zeitschrift: | 318 |
| (Heft-)Nummer: | 2 |
| Kollation: | 10 Seiten |
| DOI: | 10.1088/1742-6596/318/2/022011 |
| URL / URN: | http://stacks.iop.org/1742-6596/318/i=2/a=022011 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | 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. |
| ID-Nummer: | Artikel-ID: 022011 |
| Zusätzliche Informationen: | 13th European Turbulence Conference (ETC13), Warsaw, Poland, 5th - 8th September, 2011 |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) |
| Hinterlegungsdatum: | 06 Jan 2012 07:29 |
| Letzte Änderung: | 07 Feb 2024 09:15 |
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Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets. (deposited 06 Feb 2024 09:58)
- Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets. (deposited 06 Jan 2012 07:29) [Gegenwärtig angezeigt]
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