Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets

Khujadze, George ; Nguyen van yen, Romain ; Schneider, Kai ; Oberlack, Martin ; Farge, Marie :
Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets.
[Online-Edition: http://stacks.iop.org/1742-6596/318/i=2/a=022011]
In: Journal of Physics: Conference Series, 318 (2) 022011/1-022011/10. ISSN 1742-6588
[Artikel], (2011)

Offizielle URL: http://stacks.iop.org/1742-6596/318/i=2/a=022011

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
Titel:	Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets
Sprache:	Englisch
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.
Titel der Zeitschrift, Zeitung oder Schriftenreihe:	Journal of Physics: Conference Series
Band:	318
(Heft-)Nummer:	2
Verlag:	Institute of Physics
Fachbereich(e)/-gebiet(e):	16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) 16 Fachbereich Maschinenbau
Hinterlegungsdatum:	06 Jan 2012 07:29
Offizielle URL:	http://stacks.iop.org/1742-6596/318/i=2/a=022011
Zusätzliche Informationen:	13th European Turbulence Conference (ETC13), Warsaw, Poland, 5th - 8th September, 2011
ID-Nummer:	doi:10.1088/1742-6596/318/2/022011
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