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UID:3c4e2030-8335-41ad-813e-9c75c30a89e9@nexttoyou
DTSTAMP:20261105T153850Z
DTSTART:20261106T150000Z
DTEND:20261106T160000Z
SUMMARY:CEE Graduate Seminar Announcement - November 6! Dr. Jeffrey S. Gua
 sto
LOCATION:Benedum Hall 319\, 3700 O'Hara Street\, Pittsburgh\, PA 15261
DESCRIPTION:Jeffrey S. Guasto\, PhD\n\nProfessor\, Department of Mechanica
 l Engineering\n\nTufts University\n\nFriday\, November 6\, 2026\n\n10:00 
 am\n\n319 Benedum Hall\n\n"Lagrangian lessons on stretching and stress in
  polymeric flows"\n\nAbstract:\n\nViscoelastic flows are pervasive in env
 ironmental\, biological\, and industrial processes\, where elastic stress
 es trigger unstable\, time-dependent flows and anomalous transport. While
  quantifying the distribution of polymeric stress is essential for predic
 ting instabilities and mixing\, direct measurements are challenging and s
 imulations are computationally expensive. In contrast to the traditional 
 Eulerian approach\, we discuss the virtues of a Lagrangian perspective\, 
 which is physically intuitive and provides new insights into polymer mech
 anics. Using microfluidic ex-periments and simulations\, we demonstrate t
 hat the topology of the polymeric stress field mir-rors the Lagrangian st
 retching field\, which depends solely on flow kinematics. Manifolds of th
 is stretching—and thus stress—field act as transport barriers\, which we 
 show regulate dispersion in viscoelastic porous media flows. Integrating 
 the Lagrangian framework with constitutive models (e.g.\, FENE-P) enables
  direct evaluation of polymeric stress from experimental or simulated vel
 oc-ity fields. Finally\, the Lagrangian dynamics of single polymers (DNA)
  are used to reconstruct the spatially resolved conformation for comparis
 on with model predictions. Ultimately\, the interplay between polymer ind
 ividualism \n\nhttp://next-to-u.app/events/3c4e2030-8335-41ad-813e-9c75c3
 0a89e9
URL:http://next-to-u.app/events/3c4e2030-8335-41ad-813e-9c75c30a89e9
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