Khujadze, George ; Nguyen van yen, Romain ; Schneider, Kai ; Oberlack, Martin ; Farge, Marie (2010)
Coherent vorticity extraction in turbulent boundary layers using orthogonal wavelets.
In: Center for Turbulence Research, Proceedings of the Summer Program 2010
Buchkapitel, Bibliographie
Kurzbeschreibung (Abstract)
High-resolution data obtained by direct numerical simulation of turbulent boundary layers are analysed by means of orthogonal wavelets. The data, originally given on a Chebychev grid, are first interpolated onto an adapted 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 thresh-olding 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: | Buchkapitel |
|---|---|
| Erschienen: | 2010 |
| 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: | 2010 |
| Verlag: | Stanford University/NASA Ames |
| (Heft-)Nummer: | XIII |
| Buchtitel: | Center for Turbulence Research, Proceedings of the Summer Program 2010 |
| Reihe: | Studying Turbulence Using Numerical Simulation Database |
| URL / URN: | http://www.stanford.edu/group/ctr/Summer/SP10/2_04_khujadze.... |
| Kurzbeschreibung (Abstract): | High-resolution data obtained by direct numerical simulation of turbulent boundary layers are analysed by means of orthogonal wavelets. The data, originally given on a Chebychev grid, are first interpolated onto an adapted 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 thresh-olding 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. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) |
| Hinterlegungsdatum: | 02 Sep 2011 13:06 |
| Letzte Änderung: | 26 Aug 2018 21:26 |
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