[Faculty] Fwd: [CSRC.COLLOQUIUM] "COHERENT FLOW MOTIONS IN TURBULENT BOUNDARY LAYERS"

[Marcie Morihiro]

--------- Forwarded message ---------
From: Jose Castillo <jcastillo at sdsu.edu>
Date: Mon, Aug 5, 2019 at 8:38 AM
Subject: Fwd: [CSRC.COLLOQUIUM] "COHERENT FLOW MOTIONS IN TURBULENT
BOUNDARY LAYERS"
To: Jose Castillo <jcastillo at sdsu.edu>



<https://lh3.googleusercontent.com/-ZPFNPh16sR0/Wt39FrXUP-I/AAAAAAAAAaw/3wQunGe20lUopmV_ggfPaDwE9cVAgVzxgCLcBGAs/s1600/image001.jpg>

DATE:  *Monday, August 12, 2019*


TITLE:


*COHERENT FLOW MOTIONS IN TURBULENT BOUNDARY LAYERS*


TIME:  *11:00AM*



LOCATION:
*E-203, Engineering Dean's Conference Room*



SPEAKER/BIO:




*Christian J. KählerInstitute for Fluid Mechanics and Aerodynamics,
Bundeswehr University Munich, Germany*




ABSTRACT:
Turbulent boundary layers are still the subject of intense scientific
investigations and with the increasing strength of numerical and
experimental techniques, more features of the turbulent motion can be
resolved that enhance our picture of near wall turbulence. Due to the
enormous progress in optical field measurement techniques (PIV / PTV),
today it is possible to non-intrusively sample the flow, even at high
Reynolds numbers, with micron resolution in all three spatial directions.
This allows for investigations of the scaling of statistical flow
quantities and near wall flow effects, such as the small reverse flow
events in the near wall region recently predicted in numerical flow
simulations. Moreover, it is possible to record turbulent boundary layer
features over a large domain in order to study the coherent large scale
flow features, such as turbulent superstructures and their scaling. Within
this presentation, the large and small scale features of various high
Reynolds number turbulent boundary layer flows will be discussed and the
link or interaction between the coherent structures will be illuminated to
better understand the puzzle of near wall turbulence and intermittency.

Biography:
Christian J. Kähler received his Physics Diploma Degree from the Technical
University Clausthal in 1997, his PhD in Physics from the Georg August
University of Goettingen in 2004 (supervisor Prof. Eckelmann) and his
Habilitation from the Technical University in Brunswick in 2008. From 1996
to 2001 Dr. Kaehler worked at the German Aerospace Center (DLR) in
Goettingen (Dr. Kompenhans), during which he had research stays at the
University of Illinois at Urbana Champaign in 1996 (Prof. Adrian) and at
Caltech in 1998 (Prof. Gharib). From 2001 to 2008 he was the head of the
research group on Flow Control and Measuring Techniques at the Technical
University Brunswick (Prof. Radespiel). He then became Professor for Fluid
Dynamics and was appointed director of the Institute of Fluid Mechanics and
Aerodynamics of the University at der Bundeswehr Munich in 2008. In 2012,
he was offered an Einstein professorship for Aerodynamics at the Technical
University Berlin (declined) and in 2017 the Technical University Darmstadt
offered him to become head of the chair of Fluid Mechanics (declined).

His research covers a broad range of topics involving the development of
optical measurement techniques on the micro and macro scale in order to
further investigate complex phenomenon in microfluidics and turbulent flows
at subsonic, transonic, and supersonic conditions. He is an associate
editor of Experiments in Fluids (Springer Nature), an editorial advisory
board member of Flow, Turbulence and Combustion (Springer Nature) and
editorial board member of Theoretical & Applied Mechanics Letters
(Elsevier) and a Steering committee member and organizer of the
International PIV Challenge (2001 Goettingen, 2003 Busan, 2005 Pasadena,
2014 Lisbon). He was chairman of the International Conference on
Experimental Fluid Mechanics 2018 and organizer of the International
Symposium on Particle Image Velocimetry in 2019. He has given over 20
keynote and named lectures and more than 80 additional invited lectures. He
has authored and co-authored over 100 archival publications and 200
conference papers. Furthermore, he is co-author of the 3rd edition of the
Springer book on Particle Image Velocimetry.



Host: Xiaofeng Liu, Aerospace Engineering

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