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CATEGORIES:Institute for Energy and Environmental Flows (IEEF
 )
SUMMARY:Subdivision-stabilised immersed b-spline finite el
 ements for fluid-structure Interaction - Dr. Fehmi
  Cirak\, Dept of Engineering
DTSTART;TZID=Europe/London:20120426T113000
DTEND;TZID=Europe/London:20120426T123000
UID:TALK37685AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/37685
DESCRIPTION:The computation of systems involving the two-way i
 nteraction between fluids and lightweight structur
 es is rife with challenges due to differences in t
 he underlying equations and the disparity of the l
 ength and time scales involved. In this talk\, a n
 ew immersed finite element method is introduced fo
 r computing fluid-structure interaction problems w
 ith geometrically and topologically complex interf
 aces. The viscous\, incompressible fluid is discre
 tized with a fixed Cartesian grid and b-spline bas
 is functions. The two-scale relationship of b-spli
 nes is used to implement an intriguingly simple an
 d efficient technique to satisfy the LBB condition
 . On non-grid-aligned fluid domains and at moving 
 fluid-structure interfaces\, the boundary conditio
 ns are enforced with a consistent penalty method a
 s originally proposed by Nitsche. In addition\, as
 pecial extrapolation technique is employed to prev
 ent the loss of numerical stability in presence of
  arbitrarily small cut-cells. In contrast to the f
 luid\, the structure is represented by beams\, mem
 branes or thin shells and is discretized with subd
 ivision finite elements. The interaction between t
 he fluid and structure is accomplished by means of
  a strongly coupled iteration scheme. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3
  0EZ
CONTACT:Catherine Pearson
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