Multiresolution analysis of the two-dimensional free decaying turbulence in a pure electron plasma
Articolo
Data di Pubblicazione:
2009
Citazione:
Multiresolution analysis of the two-dimensional free decaying turbulence in a pure electron plasma / G. Bettega, R. Pozzoli, M. Romé. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 11(2009 May 19), pp. 053006.1-053006.10.
Abstract:
The two-dimensional (2D) freely decaying turbulence is investigated
experimentally in an electron plasma confined in a Malmberg–Penning trap
and studied using a wavelet-based multiresolution analysis. The coherent and
incoherent parts of the flow are extracted using a recursive denoising algorithm
with an adaptive self-consistent threshold. Only a small number of wavelet
coefficients (but corresponding to the greatest part of the enstrophy or energy
contents) turns out to be necessary to represent the coherent component. The
remaining small amplitude coefficients represent the incoherent component,
which is characterized by a near Gaussian vorticity PDF. Scale contributions to
the measured enstrophy and energy distributions are inferred, and the results are
compared with recent experiments and theoretical pictures of the 2D turbulence.
The results suggest that the computational complexity of 2D turbulent flows may
be reduced in simulations by considering only coherent structures interacting
with a statistically modeled background.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
G. Bettega, R. Pozzoli, M. Romé
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