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SUMMARY:MechE Colloquium: The hydrodynamics of propulsion in rowing
DTSTART:20211005T121500
DTEND:20211005T131500
DTSTAMP:20260504T065058Z
UID:6e4acebd9f41185f0111d89f8dd58943307a71898847613e3a3f7670
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jerry Westerweel\, Mechanical\, Maritime and Materials E
 ngineering\, Process and Energy\, Fluid Mechanics\, TU Delft\nAbstract:\nI
 n order to improve the performance in rowing contests\, we built a Ro(w)bo
 t in which we can perform detailed measurements around a 1:2 scale model o
 f an actual rowing blade that moves along a realistic path through water. 
 The set-up allows us to measure both the forces and the impulsive flow by 
 means of time-resolved PIV. We first investigated a more academic case of 
 an accelerating rectangular plate along a straight path\, which matches th
 e first stroke at the start of a race. This showed that the forces during 
 the acceleration phase are considerably higher than for steady motion. Als
 o\, it demonstrated that there is an optimal depth below the water surface
  that maximises the drag force. In the second phase of this study we consi
 dered the complete motion of an actual rowing blade. This revealed that th
 e generated impulse is not aligned with the propulsive direction\, indicat
 ing that the propulsion is suboptimal. A simple adjustment is proposed to 
 optimise the alignment of the leading and trailing edge vortices that achi
 eves an improved alignment of the generated impulse with respect to the mo
 tion of the boat.\n\nBio:\nJ. Westerweel obtained his M.Sc. degree in appl
 ied physics in 1988 at the Delft University of Technology\, where he also 
 obtained in Ph.D. degree in 1993. He then became a Research Fellow at the 
 Royal Netherlands Academy of Arts and Sciences\, and worked as a visiting 
 scholar at Stanford University\, the California Institute of Technology\, 
 and the University of Illinois at Urbana-Champaign. In 2001 he was appoint
 ed as a Anthoni van Leeuwenhoek professor at the Delft University of Techn
 ology\, and since 2005 he holds the fluid mechanics chair at the Faculty o
 f Mechanical\, Maritime and Materials Engineering.\nHis research interests
  are turbulence\, dispersed multiphase flows\, microfluidics\, biological 
 fluid dynamics\, impulsive flows\, and the fluid dynamics of sports. He is
  the (co-) author of a text book on particle image velocimetry and one on 
 turbulence. He has been an Editor-in-Chief for ‘Experiments in Fluids’
  since 2012.
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u
 s/j/65093257313
STATUS:CONFIRMED
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