BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:NUMERICAL MODELING OF YIELD-STRESS FLUIDS VS. THIXOTROPIC FLUIDS F
 LOWS - Dr Rudy Valette\, Associate Professor Cemef\, Mines ParisTech
DTSTART:20120907T120000Z
DTEND:20120907T130000Z
UID:TALK39552@talks.cam.ac.uk
CONTACT:Vanessa Blake
DESCRIPTION:Yield-stress fluids and thixotropic fluids are known to\nexhib
 it similar flow curves (flow rate vs. pressure drop) in steady shear flows
  such as Poiseuille flows. Such similarities may lead to \ni) confusion wh
 en identifying constitutive equations\, ii) wrong predictions in 3D comple
 x flows.\nIn this presentation\, similarities and differences in several c
 omplex flows of the simplest yield-stress and thixotropic fluid models tha
 t exhibit the same flow curves are studied.\nTo perform the resolution of 
 2D-3D flows\, a finite element method based on an a posteriori error estim
 ation and anisotropic mesh adaptation is proposed. This method\, coupled t
 o an explicit treatment of highly nonlinear flow constitutive models\, all
 ows capturing extreme localization of high strain rates flow regions such 
 as shear banding.\nIt is shown\, in 3D benchmark flows\, that for a range 
 of mean (i.e. apparent) strain rates\, symmetry breaking and shear banding
  occur for thixotropic fluid models whereas yield-stress fluid models exhi
 bit smoother flow features.
LOCATION:Lecture Theatre 1\, Department of Chemical Engineering and Biotec
 hnology\, New Museums Site
END:VEVENT
END:VCALENDAR