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UID:0-336@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20190408T163000

DTEND;TZID=Asia/Jerusalem:20190408T173000

DTSTAMP:20230527T134735Z

URL:https://aerospace.technion.ac.il/events/effect-of-distributed-surface-
 roughness-on-the-dynamics-of-shear-layers-including-drag-reduction-and-the
 -laminar-turbulent-transition/

SUMMARY:Effect of Distributed Surface Roughness on the Dynamics of Shear La
 yers including Drag Reduction and the Laminar-Turbulent Transition
DESCRIPTION:Lecturer:Prof. J.M. Floryan\n Faculty:Department of Mechanical 
 and Materials Engineering\n Institute:The University of Western Ontario\, 
 Canada\n Location:Classroom 165\, ground floor\, Library\, Aerospace Eng.\
 n Zoom: \n Abstract: \n Details: \n It has been recognized since the pione
 ering experiments of Reynolds in 1883 that surface roughness plays a signi
 ficant role in the dynamics of shear layers. This is a classical problem i
 n fluid dynamics but\, nevertheless\, its resolution is still lacking. Mos
 t of the efforts have been focused on experimental approaches that have re
 sulted in a number of correlations but have failed to uncover the mechanis
 ms responsible for the flow response. Theoretical analyses have also faile
 d to provide a consistent explanation of the flow dynamics. As there are a
 n uncountable number of possible geometrical roughness forms\, the problem
  formulation represents a logical contradiction as it might not be possibl
 e to find a general answer to a problem that has an uncountable number of 
 variations.\nThe recent progress towards the theoretical resolution of thi
 s apparent contradiction will be discussed and recent results dealing with
  the problem of distributed surface roughness will be presented. The progr
 ess has hinged on the development of the immersed boundary conditions meth
 od and the reduced geometry concept. It will be shown that it is possible 
 to propose a rational definition of a hydraulically smooth surface by invo
 king flow bifurcations associated with the presence of roughness. Successf
 ul resolution of roughness problems gives access to the design of surface 
 roughness for passive flow control where drag reduction can be achieved ei
 ther directly\, through re-arrangement of the form of the flow that result
 s in the reduction of the shear stress\, or indirectly\, through delay of 
 the laminar-turbulent transition.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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