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SUMMARY:Plenary Lecture 12: Slamming in flexible-channel flows - Jensen\, 
 O (University of Manchester)
DTSTART:20140627T103000Z
DTEND:20140627T111500Z
UID:TALK53200@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: Feng Xu (University of Nottingham) \n\nLarge-amplit
 ude self-excited oscillations of high-Reynolds-number flow in a long flexi
 ble-walled channel can exhibit vigorous slamming motion\, whereby the chan
 nel is almost completely occluded over a very short interval in space and 
 time. Treating the flexible channel wall as an inertialess elastic membran
 e\, this near-singular behaviour is exhibited in two-dimensional Navier-St
 okes simulations and can be captured in a reduced one-dimensional PDE mode
 l (Stewart et al. J. Fluid Mech. 662:288\, 2010). The properties of the ri
 gid parts of the system\, upstream and downstream of the membrane\, play a
  major role in determining the onset of oscillations. In order to investig
 ate the extreme flow structure that arises during a brief slamming event\,
  we systematically reduce the PDE model to a third-order nonlinear algebra
 ic-differential system\, which identifies the likely dominant physical bal
 ances. \n
LOCATION:Seminar Room 1\, Newton Institute
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