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SUMMARY:Parallel computation of vortex tube reconnection using graphics ca
 rd and vortex particle methods - Kudela\, H\, Kosior\, A (Wrocław Univers
 ity of Technology \, Poland)
DTSTART:20120726T141000Z
DTEND:20120726T143000Z
UID:TALK39066@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Understanding the dynamics and mutual interaction among variou
 s types of vortical motions is a key ingredient in clarifying and controll
 ing fluid motions . One of the most fundamental 3D vortical interactions r
 elated to the vortex tube reconnection. In the paper will be present the n
 umerical results of the vortex tube reconnections for different initial co
 nfigurations like reconnection o the vortex tube with counter-rotating vor
 tices that are initially parallel and was sinusoidal perturbed (Crow insta
 bility)\, the vortex reconnection of the initially straight offset tube an
 d reconnection of the vortex rings . We try to find and demonstrate some u
 niversal process for core reconnections. It will be shown the effect of mi
 xing of the fluid by the reconnection. It was done by tracing the passive 
 markers that were initially placed near the space where the reconnection t
 ook place. For numerical simulations we use the vortex particle methods. D
 ue to the large time consuming at single processor unit we constructed the
  numerical code for multiprocessor unit of graphics card. It was proved th
 at vortex particle method in version Vortex -in Cell are very good suited 
 for parallel computation. We carefully tested the method by comparing the 
 numerical results with some theoretical results (the motion of the vortex 
 ring) and with results that were published in literature. The speed-up whi
 ch we obtained was nearly 50 times grater with comparison to the single pr
 ocessor. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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