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Computational Fluid Dynamics
Lecture 20
Outflow Boundary Conditions
Constant advection implementation
For the Boundary point
i
use the one way wave equation:
n
x
=
0
uu
C
tx
∂∂
+=
with a stable discretization, one sided, up wind spatial derivative.
For
1
1
nn
n
n
nx
nx
nx
nx
u
C
tt
x
+
−
−−
∂
==
−
∆∂
∆
Leap Frog is probably adequate, or even 1
st
order Euler, or
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 Spring '07
 Slinn

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