BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Scaling criteria for high Reynolds and Peclet number turbulent flo
 w\, scalar transport\, mixing\, and heat transfer - Zhou\, Y (LLNL)
DTSTART:20081003T130000Z
DTEND:20081003T133000Z
UID:TALK13876@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Very high Reynolds (Re) and Peclet (Pe) number turbulent flows
  are commonly encountered in engineering\, geophysical and astrophysical a
 pplications. In comprehensive statistical flow experiments or correspondin
 g direct numerical simulations of high Re and Pe number turbulent flow\, s
 calar transport\, mixing\, and heat transfer the energetic excitation infl
 uences of the entire range of dynamic spatial scales combining both veloci
 ty fluctuations and passive scalar variances must be considered together. 
 However\, direct computational simulations or experiments directed to the 
 very high Re and Pe flows of practical interest commonly exceed the resolu
 tion possible using current or even foreseeable future super computer capa
 bility or spatial\, temporal and diagnostic technique limitations of curre
 nt laboratory facilities. Pragmatic considerations and practical needs pro
 mote use of statistical flow data bases developed from direct numerical si
 mulations or experiments at the highest Re and Pe levels achievable within
  the currently available facility limitations. Unfortunately the obtainabl
 e levels are lower than those associated with the flows of practical inter
 est. Moreover\, at present\, there is no metric to indicate whether and ho
 w much of the fully resolved physics of the flow of interest has been capt
 ured within the facilities available to the investigator. This talk presen
 ts metric criteria based on establishing a smaller subset of the total ran
 ge of dynamic scale interactions that will still faithfully reproduce all 
 of the essential\, theoretically significant\, influences of the complete 
 range of scale interactions associated with the flows of practical interes
 t. The present work leads to the identification of the minimum significant
  Re flow and Pe field that a researcher must attain in direct simulation o
 r experiment (hereafter called the minimum state). These threshold criteri
 a levels are minimum values to be attained in experiments or direct simula
 tions which assure that the energy-containing scales of the flows ? and sc
 alar fields under investigation are not contaminated by the (non-universal
 ) velocity dissipation and scalar diffusivity inertial range scale limits.
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR