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SUMMARY:Drag of turbulent flows over rough surfaces - Bettina Frohnapfel (
 Karlsruhe Institute of Technology (KIT))
DTSTART:20220331T123000Z
DTEND:20220331T130000Z
UID:TALK171194@talks.cam.ac.uk
DESCRIPTION:Rough surfaces occur widely in engineering and nature. Typical
 ly\, these surfaces do not influence the drag (flow resistance) for lamina
 r flows. However\, under turbulent flow conditions the drag experienced by
  a rough surface can significantly exceed the one of smooth surfaces. From
  an engineering perspective\, this drag increase due to surface roughness 
 needs to be predicted since it determines energy expenditure and thus also
  related emissions. The existing predictive tools still carry a relatively
  large uncertainty with the biggest challenge stemming from the fact that 
 the drag of a rough surface can presently not reliably be predicted by sur
 face properties. A lot of ongoing research efforts are dedicated to improv
 ing the link between geometrical surface properties and the effective flui
 d drag. An additional challenge are inhomogeneous rough surfaces in which 
 different roughness properties are found in different locations of a rough
  surface. This talk addresses in particular the drag properties of surface
 s with spanwise variations of the surface properties.
LOCATION:Seminar Room 1\, Newton Institute
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