[GTP] GTP Seminar March 6, 2012

[Carolyn Mueller]

Just a reminder of next week's seminar.

Carolyn Mueller
NCAR IMAGe
1850 Table Mesa Drive 
Boulder, CO 80305 
www.image.ucar.edu 
Tel: 303 497-2491
Fax: 303-497-2483



Carolyn Mueller wrote:
> Tuesday, March 6, 2012
> Refreshments
> Mesa Laboratory, Main Auditorium
> Lecture at 11:00am
>
> Non Kolmogorov Elements in Small-scale Turbulence Dynamics:
> bypassing the Cascade
> James G. Brasseur
> Pennsylvania State University
> APS Faculty Fellow, NCAR
>
>
> The Kolmogorov 1941 (K41) phenomenology dominates our understanding of 
> internal interscale dynamics within high Reynolds number free 
> turbulence. In particular, K41 underlies a description of inertial 
> turbulence dynamics that is restricted, on average, to nonlinear 
> interactions among turbulence motions that are commensurate in scale. 
> Thus, the small-scale dissipation-dominant turbulence motions 
> dynamically communicate with the large-scale energy-dominant motions 
> only indirectly, through a sea of local scale interactions that 
> progressively isotropize turbulence structure as energy and momentum 
> move to progressively smaller scales. Kolmogorov dynamics, however, is 
> restricted to turbulence in equilibrium. There exist potentially 
> useful unexplored nonlinear interscale dynamics when turbulence is 
> forced out of equilibrium. I will address three interrelated dynamics 
> in a general discussion of scale interactions in high Reynolds number 
> free turbulence, contrasting equilibrium and nonequilibrium turbulence 
> dynamics: (1) fundamental issues of energy exchange within triadic 
> interactions and general features of “local,” “non-local,” and 
> “distant” triadic interactions, (2) nonclassical interscale inertial 
> dynamics as fully developed isotropic decaying turbulence is 
> anisotropically forced from equilibrium, and (3) a study in which the 
> phase changes at the small scales are found to be strongly influenced 
> by distant triadic interactions in stationary isotropically forced 
> turbulence.
>
>
>
> Carolyn Mueller
> NCAR IMAGe
> 1850 Table Mesa Drive Boulder, CO 80305 www.image.ucar.edu Tel: 303 
> 497-2491
> Fax: 303-497-2483
>