Speaker
Dr
Paolo Muratore-Ginanneschi
(University of Helsinki)
Description
We inquire the scaling properties of the 2d Navier-Stokes
equation sustained by a forcing field with Gaussian
statistics, white-noise in time and with power-law
correlation in momentum space of degree 2-2*epsilon.
This is at variance with the setting usually assumed to
derive Kraichan's classical theory. We contrast accurate
numerical experiments with the different predictions
provided for the small epsilon regime by Kraichnan's
double cascade theory and by renormalization group (RG)
analysis. We give clear evidence that for all epsilon
Kraichnan's theory is consistent with the observed
phenomenology. Our results call for a revision in the RG
analysis of (2d) fully developed turbulence.
Primary author
Dr
Paolo Muratore-Ginanneschi
(University of Helsinki)
