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version 4.2
authored
Oct 28, 2025
by
Udo Ziegler
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3-NIRVANA-user-guide/3.1-Code-basics.md
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@@ -413,7 +413,7 @@ the following criteria:
<0.8
\m
athcal{E}_{U} &
\f
orall U
\q
uad
\h
box{derefinement}
\\
\e
nd{array}
\r
ight.$$


{width=80%}
The criterion is applied to physical variables $U$
($=
\{\v
arrho,
\m
athbf{m},e,
\m
athbf{B},C_
\m
athrm{c}
\}
$). Undivided
first ($
\d
elta U$) and second ($
\d
elta^2U$) differences are computed along
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@@ -444,7 +444,7 @@ the following criteria:
>1.25\delta s & \mbox{derefinement}\\
\e
nd{array}
\r
ight.$


{width=80%}
where the first factor is the local Jeans
length with $c_s$ the sound speed and $G$ the gravitational
constant, and where $
\d
elta s=
\m
in
\{\d
elta x,h_y
\d
elta y, h_z
\d
elta z
\}
$.
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@@ -461,7 +461,7 @@ the following criteria:
>1.25\delta s & \mbox{derefinement}\\
\e
nd{array}
\r
ight.$$

{width=
5
0%}

{width=
8
0%}
where the first factor is the Field length with
$L(
\v
arrho, T)$ the density- and temperature-dependent heatloss
function and $
\k
appa$ the thermal conduction coefficient.
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