GALCIT Colloquium
Guggenheim 133 (Lees-Kubota Lecture Hall)
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.
For more information, please contact Subrahmanyam Duvvuri by phone at 626-395-4455 or by email at [email protected].
Event Series
GALCIT Colloquium Series