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SUMMARY:Multi-scale modelling of segregating granular flows
DTSTART:20151126T121500
DTEND:20151126T130000
DTSTAMP:20260406T194621Z
UID:01d09d9d4eec2c7b0e7da9a65be0881cc9e5425fb6173a811274d420
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Anthony Thornton\, University of Twente\nBio: Anthony Th
 ornton works jointly between the Multi-scale Mechanics (MSM) and Mathemati
 cs of Computational Science (MaCS) groups.\nHis main research interest is 
 in granular materials\, primarily size segregation in dense granular avala
 nche flows. During this research a continuum model of size segregation for
  dense granular free surface flows was developed and compared to simple la
 boratory experiments.\nCurrent research focus is now on using this model a
 nd particle simulation methods to explain phenomena caused by segregation.
  These include pattern formation in rotation drums\, levee formation in ge
 ophysical flows\, particle size structure of a flowing finite mass of mate
 rial in avalanches and axial segregation in long rotating cylinders.\nFrom
  inclined planes to drums\; via a volcano\nMany flows in the natural envir
 onment or industry consist of shallow rapidly moving segregating granular 
 flows (e.g. from snow avalanches\, landslides\, debris flows\, pyroclastic
  flows to flows in rotating drum mixers\, kilns and crushers). It is impor
 tant to know the degree of segregation in such flows as it is vital to pre
 dict the flow dynamics accurately.\nContinuum methods are able to simulate
  the bulk behaviour of such flows\, but have to make averaging approximati
 ons reducing the degree of freedom of a huge number of particles to a hand
 ful of averaged parameters.  Once these averaged parameters have been tun
 ed via experimental\, simulational or historical data\, these models can b
 e surprisingly accurate\; but\, a model tuned for one flow configuration o
 ften has no predictive capability for another setup.\nOn the other hand di
 screte particle methods are a very powerful computational tool that allow 
 the simulation of individual particles by solving Newton's laws of motion 
 for each particle. With the recent increase in computational power it is n
 ow possible to simulate flows containing a few million particles\; however
 \, for 1mm particles this would represent a flow of approximately 1 litre\
 , which is many orders of magnitude smaller than the flow volumes found in
  industry or nature.\nThis talk will focus on a simplified example of bi-d
 ispersed dry granular flows (varying in size and density) on inclined plan
 es and in rotating drums. We will investigate this problem via the continu
 um modelling approach (both numerical and analytical solutions will be pre
 sented) and particle simulations\, and conclude by discussing how both can
  be combined to reveal deeper insight.
LOCATION:GC B1 10 http://plan.epfl.ch/?request_locale=fr&room=GC+B1+10&dom
 ain=places
STATUS:CONFIRMED
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