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SUMMARY:Turbulence over textured surfaces - Ricardo Garcia Mayoral
DTSTART:20250205T140000Z
DTEND:20250205T150000Z
UID:TALK227890@talks.cam.ac.uk
CONTACT:Anna Walczyk
DESCRIPTION:This talk will present an overview of the understanding our gr
 oup has gained in the last 5-10 years on the interaction of surface textur
 e in general with wall turbulence. I will argue that this interaction occu
 rs essentially through two physical mechanisms. In the first\, surface tex
 ture imposes a set of effective\, homogeneous boundary conditions on the o
 verlying\, texture-incoherent background turbulence. The effect of inertia
  and the lack of separation of scales between the texture and the turbulen
 t eddies are then key features. When the resulting transpiration effect is
  small\, slip dominates\, turbulence remains smooth-wall-like and the effe
 ctive boundary conditions give rise to Paolo Luchini's `protrusion-height'
  regime. When the transpiration effect is large\, it can account on its ow
 n for the changes in the overlying turbulence\, as is the case for high-pe
 rmeability porous substrates. The second mechanism is the non-linear inter
 action of the texture-coherent flow with the overlying\, texture-incoheren
 t turbulence\, which acts on the latter as a forcing term altering the mom
 entum equations. This term can be added back into texture-less simulations
 \, and is sufficient to capture the effect of the texture granularity on t
 he overlying turbulence.
LOCATION:JDB Seminar RM
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