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DTSTART:20250330T030000
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DTSTAMP:20260424T102223Z
UID:1747908000@ist.ac.at
DTSTART:20250522T120000
DTEND:20250522T130000
DESCRIPTION:Speaker: Sarath Suresh\nhosted by Robert Seiringer\nAbstract: F
 lows of ordinary fluids such as water or air transition from laminar to tu
 rbulent motion as the velocity increases. This simple dependence of the fl
 ow state solely on inertia\, does not apply to more complex substances suc
 h as polymeric and biofluids which commonly have elastic as well as viscou
 s properties. Here various different instabilities and turbulent states ca
 n arise at low and even vanishing inertia\, while high inertia turbulence 
 counterintuitively is suppressed and its drag strongly reduced. We here sh
 ow in experiments of a viscoelastic model fluid that the phenomena observe
 d at low and high inertia have a common origin and that the same dynamical
  state  persists across four orders of magnitude in Reynolds number\, ran
 ging from very low inertia\, all the way to high inertia Maximum drag redu
 ction (MDR) asymptote. We also explore the transitions from Newtonian turb
 ulence to MDR\, and specific cases of flow at high polymer concentrations\
 , exploring the relationship between flow at these wide range of control p
 arameters.
LOCATION:Sunstone Bldg / Ground floor / Lab Meeting room (I23.EG.005) and Z
 oom\, ISTA
ORGANIZER:
SUMMARY:Sarath Suresh: Thesis Defense: Turbulence in Polymeric Flows: A Cha
 racterisation of Elasto-Inertial Turbulence and the Maximum Drag Reduction
  Asymptote 
URL:https://talks-calendar.ista.ac.at/events/5824
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