View source for Abstr:High Reynolds Number Flow around Airfoil in Deep Stall

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__NOTOC__
== Flows Around Bodies ==       
=== Underlying Flow Regime 2-11 ===
= Abstract =
The flow around airfoils at high (beyond stall) angles of attack  is  a
fundamental  problem  of  external  aerodynamics.   Conventional   RANS
turbulence models are not only incapable of predicting  a  steady  mean
flow for this UFR with acceptable accuracy  but  also  "by  definition"
cannot capture its essential  features  (inherent  3-dimensionalty  and
unsteadiness) which are of significant interest for aero-acoustics  and
aero-elasticity applications.  These  circumstances  have  defined  the
primary choice of specific test case, namely the flow around a NACA0021
airfoil at 60&deg; angle of attack, as the only one for which  experimental
data on unsteady as well as mean  flow  characteristics  are  available
[&#8204;[[UFR_2-11_References#27|27]], [[UFR_2-11_References#28|28]]] and for which a wide spectrum of computations  with  different
CFD codes has been carried out in  the  framework  of  the  EU  DESider
Project [&#8204;[[UFR_2-11_References#5|5]]]. The very similar case of the thinner NACA0012  airfoil  in
deep stall is employed as a related secondary test case from which past
experience  allows  additional  best  practice  advice  (BPA)   to   be
extracted. Two principal purposes are envisaged for this UFR  case  and
BPA. Firstly, to document the experience gained  with  respect  to  the
most suitable  computational  techniques,  in  order  to  advise  users
considering the practical computation of similar flows.  Secondly,  the
case is envisaged  as  an  ideal  verification  case  for  testing  new
developments or implementations of turbulence-resolving models, such as
hybrid RANS-LES approaches.
<br/>
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{{ACContribs
|authors=Charles Mockett; Michael Strelets
|organisation=Upstream CFD GmbH, Berlin; New Technologies and Services LLC (NTS) and St.-Petersburg State Polytechnic University
}}
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