[mesa-users] Too much mesh points

[Pablo Marchant]

One thing that happens if an important composition jump appears, is that
MESA will increase the resolution at that point all the way
to min_dq_for_xa = 1d-14. I think for almost any situation this could be
overkill, so it could be an additional place to relax the mesh controls.

On Fri, Aug 5, 2016 at 7:09 PM, Robert Farmer <rjfarmer at asu.edu> wrote:

> > I need around 3,000 mesh points across my model. For that purpose, I
> customise the mesh distribution, and put quite some weight around the
> convective and overshooting boundaries. That is when the problems begin, as
> soon as the mu-gradient layers develop.
>
> Can you not just weaken your re-meshing controls then? Or do you really
> need the resolution in those regions and would be happy to have less
> resolution away from the convection/overshoot boundaries?
>
> Rob
>
> On Fri, Aug 5, 2016 at 8:00 AM, Francis Timmes <fxt44 at mac.com> wrote:
>
>> hi ehsan,
>>
>> as an experiment try setting max_dq = 1/(desired number of cells)
>> and removing all the customized fine-grain mesh controls being set.
>> does this run to completion?
>>
>> fxt
>>
>>
>>
>>
>> > On Aug 5, 2016, at 3:07 AM, Ehsan Moravveji <e.moravveji at gmail.com>
>> wrote:
>> >
>> > Dear MESA users,
>> >
>> > I would like to share an issue I’m facing (excessive number of mesh
>> points), and ask for your inputs.
>> >
>> > I’m setting up an inlist to compute models from 1.5 Msun to 35 Msun,
>> for later seismic modelling. Life goes pretty happy in the “lower” end,
>> while on the “upper” end, some of my models fail due to the number of mesh
>> exceeding the limit max_allowed_nz=20,000. This happens after ~370 steps,
>> when centre_h1~0.69.
>> > I have attached my inlist (v.8845) for a 35Msun model, with exponential
>> overshoot f=0.04, and min_D_mix=1d9. This is an extreme case, I know; but,
>> once this case is solved, the more relaxed cases will hopefully work too.
>> >
>> > The point is: if I stick to the default mesh adjustment, the evolution
>> proceeds with ~950 mesh points, without buttlenecks. However, this is too
>> poor resolution for calling GYRE afterwards. I need around 3,000 mesh
>> points across my model. For that purpose, I customise the mesh
>> distribution, and put quite some weight around the convective and
>> overshooting boundaries. That is when the problems begin, as soon as the
>> mu-gradient layers develop.
>> >
>> > My “bucket list”, here, is slim: I “wish” experimenting with high mass
>> models, including intensive mixing, and having reasonable number of mesh
>> points.
>> > Do you have suggestions how to reach that in one go?  ;-)
>> >
>> > Best regards,
>> > Ehsan.
>> > <M35.inlist>
>> >
>> > <stdout.png>
>> >
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-- 
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD student, Argelander-Institut für Astronomie
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