TY - JOUR
T1 - Coherent structures and conditional statistics in inhomogeneous turbulent mixing
AU - Stolovitzky, Gustavo
AU - Aider, Jean Luc
AU - Wesfreid, Jose Eduardo
PY - 1997/6/9
Y1 - 1997/6/9
N2 - We study the statistics of a passive scalar mixed by a turbulent flow that contains coherent structures (Görtler vortices). These structures entrain the passive scalar in such a way that its one-point probability density function (pdf) has a nonstandard shape that can be explained as a superposition of a background Gaussian mixing on the one hand, and the action of the Görtler vortices on the other. We propose a “mean field” approach to predict this pdf. This study (applicable to a wider class of systems) constitutes the first experimental example for which the conditional expectation of the second temporal derivative of the concentration of a passive scalar given the concentration deviates from a linear behavior.
AB - We study the statistics of a passive scalar mixed by a turbulent flow that contains coherent structures (Görtler vortices). These structures entrain the passive scalar in such a way that its one-point probability density function (pdf) has a nonstandard shape that can be explained as a superposition of a background Gaussian mixing on the one hand, and the action of the Görtler vortices on the other. We propose a “mean field” approach to predict this pdf. This study (applicable to a wider class of systems) constitutes the first experimental example for which the conditional expectation of the second temporal derivative of the concentration of a passive scalar given the concentration deviates from a linear behavior.
UR - https://www.scopus.com/pages/publications/0039529136
U2 - 10.1103/PhysRevLett.78.4398
DO - 10.1103/PhysRevLett.78.4398
M3 - Article
AN - SCOPUS:0039529136
SN - 0031-9007
VL - 78
SP - 4398
EP - 4401
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
ER -