[GTP] GTP Seminar-Alain Pumir

[Silvia Gentile]

GTP Seminar

THE PIROUETTE EFFECT IN TURBULENT FLOWS: AN EXAMPLE OF WHAT CAN BE 
LEARNED FROM LAGRANGIAN TETRADS
Alain Pumir
Laboratoire de Physique, Ecole Normale Supérieure de Lyon

The dynamics of the velocity gradient tensor, and in particular of 
vorticity, plays a crucial role for our understanding of turbulent 
flows. I will discuss recent numerical and experimental results 
concerning the "perceived velocity gradient tensor", constructed with 
the help of 4 points (a tetrad).
The evolution of the shape of the tetrad and of the perceived velocity 
gradient tensor sheds new light on the intriguing properties of 
alignment between vorticity and the strain eigenvectors observed in 
turbulent flows.


Monday, June 4, 2012
Foothills Laboratory 2, 1022 Large Auditorium
Lecture at 3:30pm




Silvia Gentile
NCAR IMAGe