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7.1.18 Radiation-transport control (LHDrad only)
7.1.18.1 real c_radtvisdtau
Using the LHDrad
module
the limit in delta optical depth (rho*kappa*dx) below which the
``radiative temperature viscosity'' (=temperature smoothing) is to be applied
can be set with e.g.
real c_radtvisdtau f=E15.8 b=4 &
n='Optical depth limit for temperature viscosity' u=1
0.1
The introduction of this ``temperature diffusion'' is a somewhat desperate and
inelegant attempt to improve the behavior of the Greens function (hot cells should
be cooled, cool cells should be heated).
This diffusion is necessary for not well resolved models.
It is switched off with c_radtvisdtau
0.0
.
7.1.18.2 real c_radtvis
Using the LHDrad
module
the amount of the ``radiative temperature viscosity'' (=temperature smoothing)
can be specified e.g. with
real c_radtvis f=E15.8 b=4 n='Temperature viscosity' u=1
1.6
For well resolved models it should be
switched off (with c_radtvis
0.0
).
7.1.18.3 real c_radthintimefac
In the LHDrad
module only the radiative time step restriction due to energy changes
can be relaxed further in the optically thin by specifying e.g.
real c_radthintimefac f=E15.8 b=4 &
n='time scale reduction in optically thin' u=1 &
c0='range: 0.1 - 1.0, typically: 0.5'
0.60
A value
0.0
or real c_radtvisdtau
0.0
switches off this
relaxation.
Next: 7.1.19 Process-time management
Up: 7.1 Parameter file: rhd.par
Previous: 7.1.17 Radiation-transport control (MSrad
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