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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Turbulence over complex walls - Shervin Bagheri (K
 TH - Royal Institute of Technology)
DTSTART;TZID=Europe/London:20220330T100000
DTEND;TZID=Europe/London:20220330T103000
UID:TALK171179AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/171179
DESCRIPTION:While our understanding of turbulence (particularl
 y drag) over rough walls is relatively mature\, we
  know much less about how other types of surface c
 omplexities such as chemical contrasts\, fouling\,
  pores\, and compliance modify turbulence and ther
 eby drag and heat transfer coefficients. The study
  of such surfaces is not only relevant for the pre
 diction and control of turbulence\, but it also pr
 ovides physical insight into wall-bounded turbulen
 ce\, particularly with respect to the emergence of
  surface-induced instabilities and other interacti
 ons of a modulating nature. I will first give an o
 verview of 'where we stand&rsquo\; regarding turbu
 lence over complex surfaces\, highlighting the out
 standing scientific questions. Then\, I will descr
 ibe our efforts in i) using homogenization and dat
 a-driven approaches to predict the roughness funct
 ion in the transitionally and fully rough regimes\
 ; ii) characterizing coherent structures\, entrain
 ment and amplitude modulation of flows over anisot
 ropic porous media and iii) controlling drag and h
 eat transfer using slippery lubricated surfaces.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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