6
Applications of DSMC simulations (II)
•
Fast, nonequilibrium gas flows (laser ablation, evaporation, deposition)
•
Flows on microscale, microfluidics
Flows in microchannes
Flows in electronic devices
and MEMS
Flow over microparticles
and clusters
Soot
clusters
Si wafer
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Basic approach of the DSMC method
•
Gas is represented by a set of
N
simulated molecules (
similar to MD
)
X
(
t
)=(
r
1
(
t
),
V
1
(
t
),…,
r
N
(
t
),
V
N
(
t
))
•
Velocities
V
i
(and coordinates
r
i
) of gas molecules are random variables.
Thus, DSMC is
a probabilistic approach in contrast to MD which is a deterministic one.
•
Gas flow is simulated as a change of
X
(
t
) in time due to
– Free motion of molecules or motion under the effect of external (e.g. gravity) forces
– Pair interactions (collisions) between gas molecules
– Interaction of molecules with surfaces of streamlined bodies, obstacles, channel
walls, etc.
Computational domain
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 Fall '11
 Zhigilei
 Operations Research, Kinetic theory, MD

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