Decomposition of Mixing Layer Turbulence into Coherent Structures and Background Fluctuations |
| |
Authors: | Jacques Lewalle Joël Delville Jean-Paul Bonnet |
| |
Institution: | (1) Department of Mechanical, Aerospace and Manufacturing Engineering, Syracuse University, 151 E.A. Link Hall, Syracuse, NY, 13244-1240, U.S.A.;(2) Laboratoire d'Etudes Aérodynamiques, UMR CNRS 6609, Université de Poitiers, France |
| |
Abstract: | The eduction of coherent structures from cross-wire rake data in a fully turbulent incompressible mixing layer confirms the
feasibility of a decomposition of a turbulent flow field, first suggested by Farge, as non-periodic non-equilibrium coherent
structures interacting with a ‘thermalized’ broad-band turbulence. A simple wavelet coefficient decimation algorithm and orthogonalization
yields non-periodic dominant flow structures and a background field that has a Gaussian distribution of velocities at the
centerline. The coherent structures are classified in terms of their topology. The non-coherent background field has flat
energy spectra and normal distribution of velocity components. Most background field statistics depend only weakly on the
type of structure on which they are superposed. It may be possible to adapt existing subgrid scale models to this decomposition.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
Keywords: | flow decomposition wavelet coherent structures mixing layer |
本文献已被 SpringerLink 等数据库收录! |
|