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SUMMARY:Subdivision-stabilised immersed b-spline finite elements for fluid
 -structure Interaction - Dr. Fehmi Cirak\, Dept of Engineering
DTSTART:20120426T103000Z
DTEND:20120426T113000Z
UID:TALK37685@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The computation of systems involving the two-way interaction b
 etween fluids and lightweight structures is rife with challenges due to di
 fferences in the underlying equations and the disparity of the length and 
 time scales involved. In this talk\, a new immersed finite element method 
 is introduced for computing fluid-structure interaction problems with geom
 etrically and topologically complex interfaces. The viscous\, incompressib
 le fluid is discretized with a fixed Cartesian grid and b-spline basis fun
 ctions. The two-scale relationship of b-splines is used to implement an in
 triguingly simple and efficient technique to satisfy the LBB condition. On
  non-grid-aligned fluid domains and at moving fluid-structure interfaces\,
  the boundary conditions are enforced with a consistent penalty method as 
 originally proposed by Nitsche. In addition\, aspecial extrapolation techn
 ique is employed to prevent the loss of numerical stability in presence of
  arbitrarily small cut-cells. In contrast to the fluid\, the structure is 
 represented by beams\, membranes or thin shells and is discretized with su
 bdivision finite elements. The interaction between the fluid and structure
  is accomplished by means of a strongly coupled iteration scheme. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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