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SUMMARY:Multi-layer structure of turbulent boundary layer and its applicat
 ion to engineering model construction - Zhen-Su She (Peking University)
DTSTART:20220329T103000Z
DTEND:20220329T110000Z
UID:TALK171155@talks.cam.ac.uk
DESCRIPTION:The multi-layer structure is a statistical (mean-field) struct
 ure of a turbulent boundary layer (TBL)\, which will be shown to stand as 
 the true similarity structure of TBL. It includes the famous log-law layer
  as a part\, but extends to cover the entire (thin) boundary layer. For qu
 ite a while\, one focus only on the logarithmic layer\, leaving many key i
 ssues undetermined\, such as their accurate locations and how they may imp
 act on our understanding of TBL in general. We will discuss a recently dev
 eloped symmetry-based multi-layer description of TBL\, which has three rem
 arkable features. The first concerns with its universal similarity nature\
 , owing to wall-induced dilation symmetry-breakings. Thus\, it applies not
  only in the wall normal direction\, for explaining sublayer\, buffer laye
 r\, log-layer\, etc.\, but also yields accurate description in the streamw
 ise direction for laminar-turbulence transitions\, since all transitions b
 etween different layers/regimes obey universal rule dictated by a Lie-grou
 p ansatz. The second is its ability to be extended from equilibrium TBL to
  non-equilibrium (engineering) TBL\, the latter simply involves more symme
 try-breakings with spatially varying multi-layer parameters. The third is 
 its intimate connection to global properties such as skin friction\, heat 
 flux\, etc.\; in other words\, knowing multi-layer structure precisely wil
 l enable to make unprecedentedly accurate predictions of practical propert
 ies which engineers are interested in. This talk will present these featur
 es\, with recent accomplishment in developing accurate models for such eng
 ineering flows as: 1) a variety of transitional flows from laminar to turb
 ulence\; 2) high speed flows around flat plate from transonic to hypersoni
 c\; 3) aeronautic flows around wing or cone\; 4) shock-induced separated f
 lows\, etc.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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