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version 4.2
authored
Oct 29, 2025
by
Udo Ziegler
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3-NIRVANA-user-guide/3.2-User-interfaces.md
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@@ -415,7 +415,7 @@ possible values or a numeric range.
Jeans-length-based mesh refinement criterion allowing a
systematic reduction of the Jeans threshold with increasing
refinement level $l$ according to the expression
`_C.amr_Jeans`$-l*$`_C.amr_dJeans`, i.e., the local
`_C.amr_Jeans`$-l*$`_C.amr_dJeans`, i.e., the local
Jeans length becomes gradually higher resolved with increasing $l$.
`_C.amr_dJeans` must be positiv.
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@@ -438,7 +438,7 @@ possible values or a numeric range.
02 0.00000e+00 0.00000e+00 0.00000e+00 >param[3-5]
03 0.00000e+00 0.00000e+00 0.00000e+00 >param[6-8]
04 0.00000e+00 0.00000e+00 0.00000e+00 >param[9-11]
05 0.00000e+00 0.00000e+00 0.00000e+00 >param[12-14]
05 0.00000e+00 0.00000e+00 0.00000e+00 >param[12-14]
06 0 0 0 0 0 0 0 0 >flag[0-7]
-
`01`
(
`_C.param[0-2]`
)
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@@ -511,7 +511,7 @@ possible values or a numeric range.
Coupling to MHD integrator is via Strang-type splitting.
- `_C.viscosity_courant`: CFL-like number in the fluid viscosity
timestep. A typical value in case of STD is $<0.
5
$. Values much
timestep. A typical value in case of STD is $<0.
4
$. Values much
larger than 1 are possible in the case of RKL.
-
`03`
(
`_C.diffusion_solver`
,
`_C.diffusion_courant`
)
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@@ -578,7 +578,7 @@ possible values or a numeric range.
solved.
- `_C.permeability_rel`: relative magnetic permeability $\mu_{rel}$
($=\mu/\mu_0
,\,
\mu_0=4\pi\cdot10^{-7}\mathtt{V}\cdot\mathtt{m}^{-1}\cdot\mathtt{A}^{-1}\cdot\mathtt{s}^{-1}$).
($=\mu/\mu_0
$,$
\mu_0=4\pi\cdot10^{-7}\mathtt{V}\cdot\mathtt{m}^{-1}\cdot\mathtt{A}^{-1}\cdot\mathtt{s}^{-1}$).
**Important:** The Gaussian unit system can be mimicked by
choosing a value ${\tt \_C.permeability\_rel}=10^7$ so that
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