BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Homogeneous isotropic turbulence with polymer additives - Pandit\,
  R (Indian Institute of Science)
DTSTART:20080929T133000Z
DTEND:20080929T140000Z
UID:TALK13835@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We investigate the effects of polymer additives on flows that 
 display homogeneous\, isotropic turbulence by extensive direct numerical s
 imulations (DNS) of (a) a shell model and (b) the Navier-Stokes equation c
 oupled to an equation for the polymer-conformation tensor (the FENE-P mode
 l). Our simulations show that the addition of polymers to such flows leads
  to dissipation reduction in both decaying and statistically steady turbul
 ence\; this dissipation reduction is the analogue of drag reduction in wal
 l-bounded flows. Our numerical results agree well with recent experimental
  results. In particular\, we find that polymers decrease the energy of the
  turbulent fluid at intermediate length scales but increase it at small le
 ngth scales\; a scale-dependent viscosity provides a natural means of unde
 rstanding our results. Preliminary studies of the multiscaling of structur
 e functions\, in the presence of polymer additives\, and shock-capturing s
 chemes for this problem are also discussed.
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR