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SUMMARY:Unravelling the effects of turbulence: Vanishing tip vortices\, sc
 attering waves\, and enhanced gas transfer - R. Jason Hearst\; Professor\,
  Norwegian University of Science &amp\; Technology (NTNU)\, Trondheim\, No
 rway
DTSTART:20241016T130000Z
DTEND:20241016T140000Z
UID:TALK222703@talks.cam.ac.uk
CONTACT:Anna Walczyk
DESCRIPTION:We will explore three topics where recent advances in experime
 ntal turbulence measurements have enabled new discoveries. First\, time-re
 solved volumetric measurements of the wake of a model wind turbine are use
 d to investigate the often-observed phenomenon whereby vortices vanish rap
 idly downstream of a wind turbine. Shifting to air-water interfacial flows
 \, we explore the mutual interaction of surface waves and subsurface turbu
 lence with specific focus on enstrophy enhancement and wave scattering. Fi
 nally\, it will be demonstrated that turbulence enhances the rate at which
  environmentally significant gases\, e.g. O2\, CO2\, transfer from air to 
 water by up to 45%.  This will be accompanied by a brief demonstration of 
 recent advances in the measurement of these flows including quantifiable l
 aser-induced fluorescence of O2 concentration in water while simultaneousl
 y measuring the velocity field and surface topology\, as well as an introd
 uction to a new co-flowing air-water facility with independently controlla
 ble turbulence in each phase using active turbulence grids. \n\nBio:\nJaso
 n Hearst is a Professor at the Norwegian University of Science and Technol
 ogy (NTNU) in Trondheim\, Norway. His primary research activities are cent
 red around the generation of bespoke turbulent flows using active turbulen
 ce generating grids and investigating how turbulence influences other cano
 nical and environmental fluids problems. His team is primarily funded via 
 the European Research Council (Starting Grant\, GLITR)\, Marie Skłodowska
 -Curie Actions (Post-doctoral fellow\, Dr. Yi Hui Tee\, InMyWaves) and the
  Research Council of Norway (FRIPRO\, WallMix\; Knowledge Building Project
 \, reSail).  Jason Hearst earned his PhD in 2015 from the University of To
 ronto Institute for Aerospace Studies (Canada)\, and then worked as a post
 -doctoral fellow at the University of Southampton (UK) with Prof. Bharath 
 Ganapathisubramani. He moved to NTNU in 2017 as an Associate Professor and
  was promoted to Professor in 2023. He is presently on sabbatical visiting
  the University of Oxford Environmental Fluid Mechanics Group.”
LOCATION:Board Room
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