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SUMMARY:Multi-field coupling strategies for large scale problems involving
  multi-fracturing solids and particulate media - Professor R Owen\, Univer
 sity of Swansea
DTSTART:20081114T140000Z
DTEND:20081114T150000Z
UID:TALK13663@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:In several applications of scientific and industrial relevance
  involving multi-fracturing solids and/or particulate media\, the system r
 esponse is governed by the presence of an additional phase\, either gaseou
 s\, liquid or both\; or by the need to consider other physical phenomena\,
  such as thermal effects.  Alternatively\, the problem may involve the com
 bined flow of particles interspersed with fine grained material\, necessit
 ating a multi-scale approach to solution.  The presentation considers the 
 essential issues necessary for an effective computational treatment of suc
 h coupled systems\, with the most appropriate route to solution being high
 ly problem dependent.\nAfter discussion of issues related to the constitut
 ive and computational modelling of continuum to discrete transformation ph
 enomena\, specific problems that are addressed include: (a) impact and exp
 losive loading applications where\, coupling takes place through an interd
 ependence between the evolving gas pressure distribution driving the fract
 uring process which\, in turn\, provides the porosity distribution which c
 ontrols the gas pressure\, (b) particle transport problems in which the pa
 rticles being transported through the fluid are large and extend over seve
 ral fluid grid cells and (c) fines migration problems in which fine partic
 les that are several orders of magnitude smaller than the main rock fragme
 nts flow through the moving particle system.  A further problem addressed 
 is heat transfer between a moving particle system at elevated temperatures
  and a surrounding pressure driven gas environment.\n\nApplicability of th
 e methodology developed is illustrated through practical examples related 
 to defence applications\, rock blasting events\, pebble bed reactor techno
 logy and mineral mining/processing operations
LOCATION:Oatley Seminar Room\, Department of Engineering
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