| タイトル | Continuous wavelet analysis of coherent structures |
| 著者（英） | Guezennec, Y.; Meneveau, C.; Ho, C. M.; Farge, M. |
| 著者所属（英） | Ecole Normale Superieure |
| 発行日 | 1990-12-01 |
| 言語 | eng |
| 内容記述 | We perform an analysis of planar cuts through three dimensional turbulent fields (planar channel flow and mixing layer) using the 2D continuous wavelet transform. We propose two new diagnostics: (1) a measure of intermittency I(r, vector x), which is the ratio of local energy and average energy at a given scale r; and (2) a local Reynolds number, defined on the local velocity contribution at a given scale, computed from the wavelet transform of the three velocity components, the scale of the transform, and molecular viscosity; this gives a representation of the local non-linearity of the flow viewed in both space and scale. We find, for the analyzed flows, strong small-scale intermittency located in the ejection regions for the channel flow and in the vortex core of the mixing layer. |
| NASA分類 | FLUID MECHANICS AND HEAT TRANSFER |
| レポートNO | 92N30673 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/230845 |
|
