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where
is the coordinate along a unit line. The face integral is mapped onto a unit
line "master element". The tangential vector and normal are given respectively by
1 (Ox
I
=
Ox(C.5)
A face integral can then by computed by
Mg
ei a
Oy\
=
nnn
f
f(Uh()x)nxi
A f
where
$9 are
E
n .t)Oi),g j 911 ( ) I, (C.6)
Wg Wf (Uh(
the Gauss points and Mg are the Gauss weights.
86
(C4)