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SUMMARY:MechE Colloquium: Avian Flight\, Turbulence and Pressure from PIV
DTSTART:20171219T121500
DTEND:20171219T131500
DTSTAMP:20260916T043719Z
UID:c7589535107133b5cb4db30bb461b8e2aafc8aceb22c871c355b6d91
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Roeland de Kat\, Aerodynamics and Flight Mechanics Researc
 h Group\, University of Southampton  \nAbstract:\nAvian Flight and Turbul
 ence\nSwifts are among the most aerodynamically refined gliding birds (Len
 tink et al. 2007). However\, the overlapping vanes and protruding shafts o
 f their primary feathers make swift wings remarkably rough for their size 
 (Lentink and de Kat 2014) and are therefore expected to produce turbulent 
 flow over them. To understand why the swift does not rely on smooth wings\
 , we performed experiments on preserved wings and physical models in a low
 -turbulence wind tunnel (Lentink and de Kat 2014) and on 3D-printed models
  in a water tunnel (van Bokhorst et al. 2015). Both listening tube and hig
 h-resolution particle image velocimetry measurements showed that the flow 
 over rough wings can be laminar. And comparison with smooth model wings sh
 owed that the rough wings aerodynamically equaled or outperformed the smoo
 th wings.\n\nTurbulence and Pressure from PIV\nPressure is a key variable 
 of interest in fluid mechanics. However\, measurement of this quantity has
  been limited to point and surface measurements and alternative methods ar
 e needed. Therefore\, I have developed several techniques to derive pressu
 re from particle image velocimetry (PIV) data. These techniques were valid
 ated on various synthetic flows and applied to different experimental data
 sets. I will discuss the techniques based on time-resolved stereoscopic-PI
 V in unsteady (predominantly) 2D flow and time-resolved tomographic-PIV fl
 ow in unsteady 3D flow (de Kat & van Oudheusden 2012\, de Kat 2012). Using
  knowledge of the flow itself\, these techniques can be simplified and tim
 e-resolved stereoscopic-PIV or snapshot tomographic-PIV can be applied to 
 obtain pressure in 3D convective turbulent flows (de Kat & Ganapathisubram
 ani 2013\, Laskari et al. 2016\, van Gent et al. 2017). If the flow itself
  is predominantly 2D\, one can even determine average pressure and pressur
 e fluctuations from snapshot planar-PIV.\n\nBio:\nRoeland de Kat obtained 
 his engineering degree and doctorate in the Aerodynamics group at Aerospac
 e Engineering\, Delft University of Technology. He joined the University o
 f Southampton to work on turbulent shear flows as a research fellow (May 2
 011 – April 2014). Roeland held the prestigious Leverhulme Trust Early C
 areer Fellowship (May 2014 – April 2017) researching “Feathers on the 
 wing”. Currently\, he is a New Frontiers Fellow and develops and improve
 s advanced flow diagnostic tools to further our understanding of feathered
  flight and engineering problems. 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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