620Extreme dissipation and intermittency in turbulence

Date:

17 May 2021 – 19 May 2021

Location:

Delft, The Netherlands

Chairperson:

Dr. Gerrit E. Elsinga
Delft University of Technology
Faculty of Mechanical, Maritime and Materials Engineering
Mekelweg 2
2628 CD, Delft
The Netherlands

Email: g.e.elsinga@tudelft.nl

Co-chairperson

Prof. Julian C. R. Hunt
University College London
Department of Earth Sciences
London WC1E 6BT
UK

Extreme viscous dissipation rates are critical in many industrial, environmental and astrophysical processes dominated by small-scale turbulence. Despite its importance, there is no suitable theory to explain the Reynolds number scaling of the dissipation PDF, its variance and extremes. Any successful new theory will need to properly account for the intermittency and the development turbulent flow structures at high Reynolds numbers. However, connecting the recent understanding of turbulent flow structure with the prediction of dissipation extrema in real industrial, environmental and astrophysical applications remains a significant challenge and opportunity.

The aim of this colloquium is to bring together scientists from different disciplines (fluid mechanics, turbulence, combustion, atmospheric and oceanic sciences, astrophysics) to discuss the key questions confronting the field. These will include:

  1. What are the turbulent flow structures relevant to dissipation and how do they depend on the Reynolds number?
  2. How do these insights in flow structure lead to new theories for the dissipation extremes? And how do these theoretical predictions compare to the available data?
  3. What are the implications of extreme dissipation and intermittency for combustion, atmospheric studies and astrophysics? And what are the open issues?