University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > On the relevance of Reynolds stresses in linear analyses of turbulent flows

On the relevance of Reynolds stresses in linear analyses of turbulent flows

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact nobody.

TURW04 - Wall-bounded turbulence: beyond current boundaries

There is a growing body of evidence that the nature of wall-bounded turbulence can be associated to a continuum of nonlinear self-sustained dynamical processes whose kinematic counterparts in the logarithmic layer are Townsend’s attached eddies. Linear energy amplification mechanisms play an important role in these dynamical processes and in the selection of the most energetic turbulent structures. I will argue that the definition of the linear operator, and in particular the inclusion (or not) of the effect of Reynolds stresses in it, has profound consequences on linear analyses of the amplifications of mean flow perturbations. It will be shown that second-order correlations can be well predicted by suitably modeling Reynolds stresses in resolvent analyses of constant-density turbulent channel flows where no information is available on forcing statistics. It will be also shown that the same type of modeling is necessary to predict the onset of turbulent large-scale convection in unstably stratified turbulent channels.

This talk is part of the Isaac Newton Institute Seminar Series series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2022 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity