<s>
Numerical	B-Algorithm
resistivity	I-Algorithm
is	O
a	O
problem	O
in	O
computer	B-Application
simulations	I-Application
of	O
ideal	O
magnetohydrodynamics	O
(	O
MHD	O
)	O
.	O
</s>
<s>
It	O
is	O
a	O
form	O
of	O
numerical	B-Algorithm
diffusion	I-Algorithm
.	O
</s>
<s>
In	O
Eulerian	B-Algorithm
simulations	I-Algorithm
where	O
the	O
field	O
is	O
arbitrarily	O
aligned	O
compared	O
to	O
the	O
simulation	O
grid	O
,	O
the	O
numerical	B-Algorithm
diffusion	I-Algorithm
rate	O
takes	O
the	O
form	O
similar	O
to	O
an	O
additional	O
resistivity	O
,	O
causing	O
non-physical	O
and	O
sometimes	O
bursty	O
magnetic	O
reconnection	O
in	O
the	O
simulation	O
.	O
</s>
<s>
Numerical	B-Algorithm
resistivity	I-Algorithm
is	O
a	O
function	O
of	O
resolution	O
,	O
alignment	O
of	O
the	O
magnetic	O
field	O
with	O
the	O
grid	O
,	O
and	O
numerical	O
method	O
.	O
</s>
<s>
In	O
general	O
,	O
numerical	B-Algorithm
resistivity	I-Algorithm
will	O
not	O
behave	O
isotropically	O
,	O
and	O
there	O
can	O
be	O
different	O
effective	O
numerical	B-Algorithm
resistivities	I-Algorithm
in	O
different	O
parts	O
of	O
the	O
computational	O
domain	O
.	O
</s>
