Speaker
Marie Farge
Description
We have proposed a wavelet based method, called Coherent
Vorticity Extraction (CVE), to extract coherent fluctuations
out of fully developed turbulent flows. We will explain its
principles and illustrate its use in the context of 3D fluid
turbulence. We will then extract coherent vorticity sheets
and coherent current sheets from DNS data of 3D forced
incompressible MHD turbulence. We will show that it
preserves both the vorticity sheets and the current sheets
present in the original fields, while retaining only a few
percent of the degrees of freedom. Studying the energy flux
confirms that the nonlinear dynamics is fully captured by
the coherent contributions only.
