[Speaker]

Prof. Mahendra K. Verma

Department of Physics, Indian Institute of Technology Kanpur

[Abstract]

In three-dimensional hydrodynamic turbulence forced at large length scales, the Kolmogorov’s energy flux is constant in the inertial range.   However, in the presence of multiscale forcing and dissipation, the energy flux $\Pi(k)$  varies in the inertial range itself.   For example, $\Pi(k)$  decreases with wavenumbers in quasi-static MHD turbulence, stably stratified turbulence, MHD turbulence and dynamo, and in flows with Ekman friction.  But, $\Pi(k)$  increases with wavenumbers in turbulent thermal convection and unstable stratified flows.  In this seminar, I will try to provide a holistic perspective on the energy flux.

References:

1. M. K. Verma, Variable Energy Flux in Turbulence, A Topical Review, J. Phys. A, 55, 013002 (2022). 

2. M. K. Verma, Energy Transfers in Fluid Flows: Multiscale and Spectral Perspectives, Cambridge Univ. Press, Cambridge (2019).