UMR 5672

logo de l'ENS de Lyon
logo du CNRS logo UCBL
You are here: Home / Seminars / Other seminars / Effective action approach to evaluation of velocity gradient PDFs in a Lagrangian turbulence model

Effective action approach to evaluation of velocity gradient PDFs in a Lagrangian turbulence model

Leonardo Grigorio (CEFET/RJ - UnED Nova Friburgo)
When Feb 26, 2015
from 10:45 AM to 12:00 PM
Where Salle 115
Attendees Leonardo Grigorio
Add event to calendar vCal
iCal
The Recent Fluid Deformation Closure (RFDC) model of lagrangian turbulence is recast in path-integral language within the framework of the Martin-Siggia-Rose functional formalism. In order to derive analytical expressions for the velocity-gradient probability distribution functions (vgPDFs), we carry out noise renormalization in the low-frequency regime and find approximate extrema for the Martin-Siggia-Rose effective action. We verify, with the help of Monte Carlo simulations, that the vgPDFs so obtained yield a close description of the single-point statistical features implied by the original RFDC stochastic differential equations.