Friday, March 1, 2013
3:00 pm
Guggenheim 101 (Lees-Kubota Lecture Hall)

GALCIT Colloquium

Contact
 of 
Particles 
in 
Fluids
Peter Wriggers, Professor, Institute of Continuum Mechanics, Leibniz University of Hannover
This
 presentation 
is 
related
 to 
contact
 and 
coupling
 of 
particles 
and 
fluids, 
and
 thus is concerned
 with 
particle‐fluid 
flow 
systems.
 These 
are 
of 
great 
practical
 importance
 in the 
production
 processes
 of 
chemical 
and 
food 
industries 
as 
well
 as 
in 
geological engineering
 problems
 related
 to 
fluvial
erosion, 
fluidized beds 
and 
sedimentation. Such 
problems
 generally 
require
 an 
accurate 
characterization 
and 
a 
highly 
resolved
 model 
of 
the 
fluid‐particle 
flow
 at 
multiple
 temporal
 and 
spatial 
scales.
 In 
particular, 
in order 
to 
account
 for 
the
 microscale 
particle‐fluid 
and 
particle‐particle 
interactions
 within 
the
 coupled
 two-phase
 flow system,
 the 
numerical 
resolution
 should 
be 
of 
the order 
of 
a
 representative 
particle
 dimension.
 For 
these 
purposes, 
an
 efficient 
fictitious 
boundary
 method 
is 
applied
 to 
the
 simulation
 of three‐dimensional 
large‐scale
 particle‐fluid
 flows.
 Within 
this 
approach,
 the 
Newton‐Euler
 equations
 of 
the 
particle 
dynamics are
 solved
 with 
the 
Discrete
 Element
 Method,
 while 
the 
Navier‐Stokes 
equations
 describing
 the
 fluid 
flow 
are 
solved
 via 
a 
multigrid
 Finite 
Element
 Method
 within 
an 
Eulerian 
setting. Coupling 
of 
the 
particles to the 
flow
 is 
realized
 by
 applying 
additional
 constraints 
to the 
Navier‐Stokes 
equations
 at
 the
 interfaces of 
the 
particle 
and 
fluid
 domains.
 The
 Eulerian 
setting 
eliminates 
the
 need
 for 
remeshing
 of 
the 
analysis
 domain
 in 
each time-
step,
 a 
process 
that 
can
 be 
prohibitively 
expensive
 for 
large 
particle 
numbers. Several
 examples
 are
 used
 to
 verify 
and
 validate 
the 
derived
 model
 and
 numerical method.
Contact Subrahmanyam Duvvuri subrahmanyam@caltech.edu at 626-395-4455
Add this event to my calendar