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SUMMARY:IGM Colloquium: Avian Flight\, Turbulence and Pressure from PIV
DTSTART:20171219T121500
DTEND:20171219T131500
DTSTAMP:20260924T095031Z
UID:7aca84cbf6400f80256b9a6fb86ec881b829164510be9f82fd6956f5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Roeland de Kat\nAvian Flight and Turbulence\nSwifts are am
 ong the most aerodynamically refined gliding birds (Lentink et al. 2007). 
 However\, the overlapping vanes and protruding shafts of their primary fea
 thers 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 expe
 riments on preserved wings and physical models in a low-turbulence wind tu
 nnel (Lentink and de Kat 2014) and on 3D-printed models in a water tunnel 
 (van Bokhorst et al. 2015). Both listening tube and high-resolution partic
 le image velocimetry measurements showed that the flow over rough wings ca
 n be laminar. And comparison with smooth model wings showed that the rough
  wings aerodynamically equaled or outperformed the smooth wings.\n\nTurbul
 ence and Pressure from PIV\nPressure is a key variable of interest in flui
 d mechanics. However\, measurement of this quantity has been limited to po
 int and surface measurements and alternative methods are needed. Therefore
 \, I have developed several techniques to derive pressure from particle im
 age velocimetry (PIV) data. These techniques were validated on various syn
 thetic flows and applied to different experimental datasets. I will discus
 s the techniques based on time-resolved stereoscopic-PIV in unsteady (pred
 ominantly) 2D flow and time-resolved tomographic-PIV flow in unsteady 3D f
 low (de Kat & van Oudheusden 2012\, de Kat 2012). Using knowledge of the f
 low itself\, these techniques can be simplified and time-resolved stereosc
 opic-PIV or snapshot tomographic-PIV can be applied to obtain pressure in 
 3D convective turbulent flows (de Kat & Ganapathisubramani 2013\, Laskari 
 et al. 2016\, van Gent et al. 2017). If the flow itself is predominantly 2
 D\, one can even determine average pressure and pressure fluctuations from
  snapshot planar-PIV.\n\nBio\nRoeland de Kat obtained his engineering degr
 ee and doctorate in the Aerodynamics group at Aerospace Engineering\, Delf
 t University of Technology. He joined the University of Southampton to wor
 k on turbulent shear flows as a research fellow (May 2011 – April 2014).
  Roeland held the prestigious Leverhulme Trust Early Career Fellowship (Ma
 y 2014 – April 2017) researching “Feathers on the wing”. Currently h
 e is a New Frontiers Fellow and develops and improves advanced flow diagno
 stic tools to further our understanding of feathered flight and engineerin
 g problems. 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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