[mesa-users] Timestep control

[Robert FARMER]

Hi
If you look in star/private/timestep.f (in fact iff you run this from your
MESA_DIR it summaries the checks done if you look at the rhs of the =; grep
-rin  "do_timestep_limits" star/private/* ). You'll see that the time step
is based on limiting the change in a various quantities like the
temperature, So the various timescales aren't explicity checked, but it a
timestep was say longer than some timescale then the change in that
quantity may be larger than some limit such that we then reduce the
timestep.

There is then the star/defaults/controls => timestep controls to find what
these maximum changes are set to.

Rob


On Tue, Aug 26, 2014 at 6:48 AM, Mathieu <mathren90 at gmail.com> wrote:

> Hi everyone,
>
> I have a (probably silly) doubt on the timestep control MESA does by
> default.
> If I am correct, in the two-stage process of picking the new timestep
> there isn't any explicit comparison between the timestep, the thermal
> timescale, mass loss timescale and other relevant time scales? So
> nothing forces the timestep to be smaller than, say, the thermal timescale?
> Or is the comparison implicitly done by the digital control-based scheme
> (I am still a bit confused by this)?
>
> Thanks,
>
> Mathieu
>
>
>
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