- 7.1.3.1 real teff
- 7.1.3.2 character grav_mode
- 7.1.3.3 real grav
- 7.1.3.4 real mass_star
- 7.1.3.5 real r0_grav
- 7.1.3.6 real r1_grav
- 7.1.3.7 real r2_grav
- 7.1.3.8 real r0_core
- 7.1.3.9 character centrifugal_force
- 7.1.3.10 real nu_rotation
- 7.1.3.11 real ar_rotationaxis

7.1.3 Fundamental model parameters

7.1.3.1 real teff

3500.0

`s_inflow`

(see below) is more important
than `teff`

itself.
See Sect. 7.1.4.4 for different heating modes controled with `heat_mode`

.

7.1.3.2 character grav_mode

c0='constant/central'

central

`central`

: For the global ``star-in-a-box'' case, a central potential is assumed with origin at x=0. The stellar mass`mass_star`

(Sect.7.1.3.4) as well as some characteristic radii (`r0_grav`

,`r1_grav`

,`r2_grav`

,`r1_grav`

,`r0_core`

) have to be specified.`constant`

: In the standard local ``box-in-a-star'' case, the constant gravity specified with`grav`

(Sect.7.1.3.3) is directed downward in direction.`localboxtide`

: This activates a simple model for the action of a tidal wave on convection in a local box model. It adds to the case of`constant`

gravity a potential which is harmonic in space and time according to

(1) `C_test`

parameters according:

= `C_test1`

(amplitude of potential variations)= `C_test2`

(horizontal wavenumber)= `C_test3`

(frequency)

Boundary conditions: in order to be compatible with periodic lateral boundaries should be an integer multiple of times the inverse lateral box size.

7.1.3.3 real grav

27500.0

7.1.3.4 real mass_star

9.94500e+33

`r0_grav`

, specified with
9.45833e+12

`r1_grav`

, specified with
c0='0.0: Not used'

11.35000e+13

`r0_grav`

is relevant).
But a value somewhat larger than the remotest corner of the box effectively
cancels this artificial smoothing in the outer layers.

7.1.3.7 real r2_grav

`r2_grav`

instead of `r1_grav`

means that a potential
function more appropriate for a polytropic stellar interior model is used.
It can be set, e.g. with
c0='0.0: Not used'

11.35000e+13

`r1_grav`

is used.
This parameter is similar to `r1_grav`

, i.e., it enlarges the pressure
scale height in the outer layers but does not change the smoothing
formula in the center. This parameter is only effective if `r1_grav`

is
set to zero.

7.1.3.8 real r0_core

`r0_grav`

(the default),
the heating radius `r0_core`

can be specified separately, e.g. with
9.45833e+12

`r0_grav`

is used as the radius of the core.

7.1.3.9 character centrifugal_force

`nu_rotation`

0. To switch it off
even for a non-zero rotation rate,
the parameter `centrifugal_force`

can be used,
e.g. by setting
c0='on: default, off: no centrifugal force, even for non-zero nu_rotation'

off

`on`

: This is the default and can be set even for non-rotating objects.`off`

: This skips the application of the centrifugal force in case of a non-zero rotation rate. In this case, only the Coriolis force is applied.

`nu_rotation`

is non-zero, but only for
global models as the centrifugal force for local models would in effect
only modify the value of the gravity constant.

7.1.3.10 real nu_rotation

0.01

`centrifugal_force`

is set to `off`

.
In addition, a Coriolis force
is applied during the hydrodynamics step.

1.0

0.0

0.0

`(0.0,0.0,1.0)`

and should be used for
rotating global models.
A different axis only makes sense for local models.