| Description | We are pleased to welcome Sutanu Sarkar, Professor in Mechanical and Aerospace Engineering at University of California San Diego, for an ME seminar on Tuesday, April 11, 2023 at 4 pm PT. The seminar is both in-person and offered on Zoom: washington.zoom.us… Seminar title: Turbulent wakes in the environment About the talk:
The wake of an object in motion with respect to its environment is a flow that is important in engineering (ships, wind turbines, aircraft, underwater submersibles, marine energy), biology (marine swimmers, aerial flyers) and geophysical (flow past underwater topography or hills and mountains) applications. We will discuss results from high-resolution simulations in a homogeneous fluid that show how the shape of a submersible, even for canonical examples, influences how the flow progresses from at the body to the near wake and into the far wake. Non-equilibrium scaling of turbulent dissipation is found to affect the progression. We will then turn to a density-stratified fluid where the structure of the submerged wake is inevitably changed. It becomes long-lived and its manifestation through turbulence, coherent motions and internal gravity waves changes qualitatively. We will demonstrate how buoyancy is linked to these changes and show that the shape of the submersible matters to buoyancy effects. About the speaker:
Professor Sutanu Sarkar received his Ph.D. from the Mechanical and Aerospace Engineering Department at Cornell University in 1988. After 4 years as a staff scientist at ICASE, NASA Langley Research Center, he joined UCSD where he is currently the Blasker Professor of Engineering. His honors include a NASA group achievement award (1994), Friedrich Wilhelm Bessel Research Prize (2001) from the Humboldt Foundation, Fellow of the American Physical Society (2006), Associate Fellow of the American Institute of Aeronautics and Astronautics (2010) and Fellow of the American Society of Mechanical Engineers (2010). He has been with the MAE UCSD Faculty since 1993 and served as the Chair of the department of Mechanical and Aerospace Engineering from July 2009 to June 2014. |
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