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SUMMARY:Closure theories for inhomogeneous turbulence - Rubinstein\, R (NA
 SA Langley)
DTSTART:20081002T164000Z
DTEND:20081002T171000Z
UID:TALK13873@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Although Kraichnan formulated the Direct Interaction Approxima
 tion and the Test-Field model for general problems of inhomogeneous turbul
 ence\, the resulting equations\, requiring repeated multiple integrations 
 over the flow domain\, are both difficult to understand and difficult to a
 pply in practice\; in the homogeneous case\, triad interactions provide th
 e key to unraveling the physics of the approximation. The goal of this wor
 k is to formulate the closure theory of some special inhomogeneous problem
 s with comparable simplicity. It is done by decomposing the inhomogeneous 
 problem into a set of coupled quasi-homogeneous problems\, each of which a
 dmits a simple formulation. The formalism will be applied to the problem o
 f weakly inhomogeneous turbulence\, where previous heuristic theories have
  been incomplete. The same formalism applies to problems admitting scaling
  transformations\; it will be applied to give a simple formulation of the 
 problem of turbulence in a half-space.
LOCATION:Seminar Room 1\, Newton Institute
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