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SUMMARY:Wall turbulence: from surface roughness to surface slip - Professo
 r Neil Sandham\, University of Southampton
DTSTART:20170310T130000Z
DTEND:20170310T140000Z
UID:TALK70386@talks.cam.ac.uk
CONTACT:Akshath Sharma
DESCRIPTION:Partial slip offers a possible route to drag reduction. A prom
 ising technique is based on textured hydrophobic surfaces in water: if an 
 air layer can be retained near the surface a significant drag reduction is
  theoretically possible. The present work includes a mix of simulation and
  experiment. Calculations in the laminar flow regime show delays in separa
 tion that offer significant drag reductions (10-20%) even when the surface
  texture (roughness) necessary to retain the air layer is included in the 
 model. Fully turbulent simulations using the Navier-slip condition show th
 e importance of slip anisotropy and roughness-resolving calculations quant
 ify the drag penalty of the underlying surface. Finally a set of experimen
 ts are conducted using a treated test surface that is towed through water 
 in the turbulent flow regime. Air layers are retained during the tests and
  drag reductions relative to wetted surfaces are measured.
LOCATION:JDB Seminar Room\, CUED
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