Following doctoral studies and a research appointment at The Johns Hopkins University, Professor Stavros Tavoularis has, since 1980, been a member of the Department of Mechanical Engineering at the University of Ottawa, where he served terms as Department Chair, Director of the Ottawa-Carleton Institute for Mechanical and Aerospace Engineering and Interim Vice Dean, Research. He is Director of the Univ. Ottawa Fluid Mechanics Laboratory, supervising a team of researchers on turbulence, turbulent mixing, vortex dynamics, aerodynamics, nuclear reactor thermal hydraulics, cardiovascular mechanics and design of flow apparatus and instrumentation. Stavros Tavoularis has been elected as a Fellow of the Canadian Academy of Engineering, a Fellow of the Engineering Institute of Canada, a Fellow of the Canadian Society for Mechanical Engineering and a Fellow of the American Physical Society and is a recipient of the George S. Glinski Award for Excellence in Research and the 2017 Medal of the Canadian Congress for Applied Mechanics. He is the author of the graduate textbook Measurement in Fluid Mechanics, published by Cambridge University Press, and numerous research articles and reports in fluid mechanics and heat transfer.
Energy dissipation in multi-structure and other non-canonical turbulence
Whether ad hoc or justified by theoretical arguments, the constancy of the dimensionless dissipation parameter, defined in terms of the turbulence kinetic energy, its dissipation rate and the length scale of the energetic motions, has been the basis of many acclaimed turbulence theories and models. The growing body of evidence that, although this postulate holds in extensive regions of canonical flows, it is invalid in other regions of the same flows will be reviewed first. This will be followed by a review of recent evidence that the dissipation parameter varies significantly in non-canonical flows, including multi-structure turbulence, which is generated by multiple, distinct production mechanisms. In several, but not all, cases, the dissipation parameter is seen to be inversely proportional to the local turbulence Reynolds number.
03 December 2020, 16h3017h30
Webinar (please contact F. Romano for the link)
