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SUMMARY: Localization\, Flow Regimes\, and Transport Pathways in Stirred Y
 ield-Stress Fluids - Ida Karimfazli (Concordia University)
DTSTART:20251203T130000Z
DTEND:20251203T140000Z
UID:TALK237334@talks.cam.ac.uk
CONTACT:Emma
DESCRIPTION:Many natural flows and industrial processes involve materials 
 that can behave simultaneously as solids and fluids\, producing strong loc
 alization and sharp transitions in flow structure. Yield-stress fluids pro
 vide a useful framework for exploring these effects. In this talk\, I exam
 ine how yield stress reshapes mixing and transport by studying a canonical
  system: a Bingham fluid stirred by a cylinder moving along a circular pat
 h in an initially stratified domain.\nIn the Newtonian limit\, mixing proc
 eeds through stretching and folding of interfaces\, diffusion across strea
 mlines\, and the advective transport supplied by shed vortices. Introducin
 g a finite yield stress reorganizes the flow in fundamental ways. Vortex s
 hedding becomes confined within a finite radius or is suppressed entirely\
 , giving rise to three distinct regimes determined by the fate of these vo
 rtices. The resulting interplay between yielded and unyielded regions loca
 lizes motion\, restricts advective pathways\, and produces persistent unmi
 xed structures.\nThese findings provide a mechanistic picture of why yield
 -stress fluids mix poorly\, clarify how small rheological variations alter
  flow topology\, and offer insight into transport in systems where localiz
 ed deformation\, layering\, or plug-like behaviour plays a central role.
LOCATION:MR12
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