Colloquium # 261

Scaling Law for Turbulence in Stratified Fluids : Kolmogorov or Bolgiano?

by Prof. Jayanta Bhattacharjee
Harish-Chandra Research Institute

Monday, August 29th 3:30 PM, Seminar Hall

Kolmogorov's 5/3-law is a cornerstone of fully developed turbulence. However, for turbulence in a density -stratified fluid, it was argued by Bolgiano (and independently by Obukhov) about fifty years ago that the 5/3  could change to 11/5. In the last several decades the 11/5  scaling had never been seen experimentally or numerically. We will discuss under what conditions would one see a 11/5 -law and show that these conditions are satisfied in the very recent simulations from IITK where this scaling has been unambiguously observed for the first time.

About the speaker

Jayanta Bhattacharjee obtained his PhD from the University of Maryland in 1979. He joined the IITK faculty in 1982 and moved to IACS, Kolkata in 1995.Subsequently, he joined S. N. Bose National Centre, Kolkata in 2008 before coming to HRI, Allahabad in 2012. His specialization is in statistical physics, hydrodynamic instabilities and nonlinear dynamics.