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SUMMARY:Diagnosing unsteady separated flows
DTSTART:20140325T140000
DTEND:20140325T150000
DTSTAMP:20260406T194538Z
UID:eaf432971df72975cd0d9ef158cce1436d6a2e221aaae48b19566756
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Karen Mulleners\, Institute of Turbomachinery and Fluid 
 Dynamics\, Leibniz University of Hannover\, Germ \nBio: Karen Mulleners w
 as born in Tongeren\, Belgium\, in 1983. She started her university educat
 ion in Belgium at the University of Hasselt\, then transferred to Eindhove
 n University of Technology in the Netherlands to complete her bachelor's a
 nd master's degrees in applied physics with specialisation in physics of t
 ransport in fluids. She received a PhD degree in mechanical engineering fr
 om the university of Hannover in Germany in 2010.  Her doctoral thesis wa
 s completed under the supervision of Prof. Markus Raffel at the German Aer
 ospace Center in Göttingen in the field of helicopter aerodynamics. From 
 2010 to 2012\, she held postdoctoral positions at the German Aerospace Cen
 ter in Göttingen and at the University of Hannover. Since 2012\, she is a
 n assistant professor at the department of mechanical engineering at the U
 niversity of Hannover.  Her research interests include modern methods of 
 coherent structure based flow diagnosis that serve to bridge the gap betwe
 en the generation and interaction of vortices and technically relevant qua
 ntities\, such as aerodynamic forces and power output\, by reference to in
 sect flight and wind turbine rotor blade aerodynamics.\nAbstract : Flow se
 paration on lifting surfaces is a commonly encountered\, mostly undesired\
 , unsteady flow condition that occurs when a critical angle of attack is e
 xceeded. The unsteady separation process comprises a series of complex aer
 odynamical phenomena\, including transition to turbulence\, shear layer in
 stability\, and large-scale vortex formation. A detailed understanding of 
 the chronology and causality of events during the development of unsteady
   flow separation is desirable to develop effective flow control measures
  and effcient analytical and computational flow models. In this regard\, t
 ime-resolved flow field measurements were combined with flow diagnostic me
 thods - including Eulerian vortex detection methods\, Lagrangian coherent 
 structure analysis and proper orthogonal flow field decomposition - to ana
 lyse the spatiotemporal evolution of coherent structures during static and
  dynamic stall on a two-dimensional airfoil. With this coherent structure 
 based diagnostics\, the physical mechanisms and parameters controlling ini
 tiation\, growth\, and subsequent detachment of large-scale stall vortices
  were identified and characterised. Fundamental importance was attributed 
 to the behaviour of the shear layer and the associated time scales were de
 termined directly from the time-resolved velocity field measurements. Foll
 owing up on this work\, modern methods of coherent structure based flow di
 agnosis are being refined to bridge the gap between the generation and int
 eraction of vortices and technically relevant quantities\, such as aerodyn
 amic forces and power output\, by reference to insect flight and wind turb
 ine rotor blade aerodynamics. Future challenges lie in the development of 
 scalable and efficient means of data reduction to handle vast amounts of h
 igh resolved experimental and computational data of unsteady flow phenomen
 a with regard to wind and water energy conversion systems and flow control
 .
LOCATION:ME B1 10 http://plan.epfl.ch/?room=MEB110
STATUS:CONFIRMED
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