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SUMMARY:MechE Colloquium: Can we tailor the behavior of flexible sheets in
  flows by adding cuts or folds?
DTSTART:20230425T120000
DTEND:20230425T130000
DTSTAMP:20260923T025718Z
UID:72e60212d8d61d8ba9eb4c179be533a7a76dd7c297d360aa9763d19e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Sophie Ramananarivo\, Laboratoire d’hydrodynamique (La
 dHyX)\, Department of Mechanics\, École Polytechnique Paris\nAbstract: Li
 ghtweight compliant surfaces are commonly used as roofs (awnings)\, filtra
 tion systems or propulsive appendages\, that operate in a fluid environmen
 t. Their flexibility allows for shape to change in fluid flows\, to better
  endure harsh or fluctuating conditions\, or enhance flight performance of
  insect wings for example. The way the structure deforms is however key to
  fulfill its function\, prompting the need for control levers. In this tal
 k\, we will consider two ways to tailor the deformation of surfaces in a f
 low\, making use of the properties of origami (folded sheet) and kirigami 
 (sheet with a network of cuts). Previous literature showed that the substr
 ucture of folds or cuts allows for sophisticated shape morphing\, and prod
 uces tunable mechanical properties. We will discuss how those original fea
 tures impact the way the structure interacts with a flow\, through combine
 d experiments and theory. We will notably show that a sheet with a symmetr
 ic cutting pattern can produce an asymmetric deformation\, and study the u
 nderlying fluid-structure couplings to further program shape morphing thro
 ugh the cuts arrangement. We will also show that extreme shape reconfigura
 tion through origami folding can cap fluid drag.\n\nBiography: Sophie Rama
 nanarivo is an Assistant Professor in the Department of Mechanics at Écol
 e Polytechnique\, and a researcher at LadHyX. After receiving her PhD in f
 luid-structure interaction at ESPCI-Paris in 2014\, she continued her rese
 arch as a postdoctoral fellow at the AML laboratory at the Courant Institu
 te of NYU (New York)\, and then in the Department of Physics at UC San Die
 go. In 2017\, she joined École Polytechnique as an Assistant Professor. H
 er research focuses on the interactions between fluids and solid objects t
 hat can move or deform. Her past work addressed questions relative to anim
 al flight and swimming\, such as the role of flows in formation of fish sc
 hools and bird flocks. She also investigated different forms of coupling a
 t the microscopic scale\, studying the interactions between microscopic sw
 immers and their colloidal environment. Currently\, she is examining the i
 nteraction of highly flexible structures with fluid flow and exploring way
 s to control their response through their design.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/64230566011
STATUS:CONFIRMED
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