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SUMMARY:Hybrid Closure Modeling with Laminar to Turbulent Transition - Pau
 l Durbin (Iowa State University)
DTSTART:20220401T103000Z
DTEND:20220401T110000Z
UID:TALK171233@talks.cam.ac.uk
DESCRIPTION:Hybrid\, non-zonal closure models can be described as interpol
 ations between RANS and LES formulas. &nbsp\;Hybrid simulations resolve la
 rge-scale turbulent eddies\, so the reference to RANS is only to&nbsp\;for
 mulas\, not to a Reynolds averaged description. &nbsp\;\nThe aim of the hy
 brid approach is to make eddy resolving more attractive for applications. 
 &nbsp\;Laminar to turbulent transition arises in some such applications. &
 nbsp\;Thus\, a basic question is\,&nbsp\;can a hybrid turbulence model pla
 usibly capture &nbsp\;laminar-to-turbulent transition? The answer is far f
 rom obvious. Indeed\, for many hybrid models\, the answer is no. However\,
  solution adaptive models do&nbsp\;have the potential to capture transitio
 n. Exactly how is a matter of empiricism\, which will be discussed. &nbsp\
 ;The initial stage is obvious: &nbsp\;precursors---instability waves\, or 
 Klebanoff streaks---are resolved. &nbsp\;But only the very earliest stage 
 of breakdown is simulated. &nbsp\;After that the subgrid model replaces&nb
 sp\;small scales\, and\, in the RANS zone\, it replaces resolved stress by
  modeled stress. &nbsp\;&nbsp\;The nature of hybrid transition will be dis
 cussed for the case of the ell^2-omega model.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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