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SUMMARY:Turbulence over complex walls - Shervin Bagheri (KTH - Royal Insti
 tute of Technology)
DTSTART:20220330T090000Z
DTEND:20220330T093000Z
UID:TALK171179@talks.cam.ac.uk
DESCRIPTION:While our understanding of turbulence (particularly drag) over
  rough walls is relatively mature\, we know much less about how other type
 s of surface complexities such as chemical contrasts\, fouling\, pores\, a
 nd compliance modify turbulence and thereby drag and heat transfer coeffic
 ients. The study of such surfaces is not only relevant for the prediction 
 and control of turbulence\, but it also provides physical insight into wal
 l-bounded turbulence\, particularly with respect to the emergence of surfa
 ce-induced instabilities and other interactions of a modulating nature. I 
 will first give an overview of 'where we stand&rsquo\; regarding turbulenc
 e over complex surfaces\, highlighting the outstanding scientific question
 s. Then\, I will describe our efforts in i) using homogenization and data-
 driven approaches to predict the roughness function in the transitionally 
 and fully rough regimes\; ii) characterizing coherent structures\, entrain
 ment and amplitude modulation of flows over anisotropic porous media and i
 ii) controlling drag and heat transfer using slippery lubricated surfaces.
LOCATION:Seminar Room 1\, Newton Institute
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