Title: Helicity in three-dimensional turbulence

Abstract:
Helicity plays an important role in many atmospheric, geophysical and
astrophysical flows. Being an invariant of the three-dimensional
Navier-Stokes equations, non-zero helicity affects certain aspects of the
turbulent flows. In this seminar I would discuss the effects of helicity on
the energy cascade and small-scale intermittency of the system.
Using the tool of Fourier-helical decomposition of velocity field we could
understand the dynamics of the basic triadic interactions involved. I would
show how some of the triads have more significance than others depending on
the boundary conditions and forcing mechanism.