[Mesa-users] hydro_newton_step failed to accept error during calculation of 2Ms

Francis Timmes fxt44 at mac.com
Sun Mar 25 16:09:25 EDT 2018

hi miszuda,

it appears you are using bill wolf's ruby-based MesaScript to generate the inlist(s). 
this is wonderful, and it would be constructive for help purposes to also send the actual 
(MesaScript generated) inlist that mesa is using.

> Additionally, sometimes in code, i get a warning: hydro_newton_step failed to accept 

this is within normal behavior. the warning usually means the attempted time step
was too large for the implicit solver to converge. mesa automatically decreases the
attempted time step and tries again.


> On Mar 25, 2018, at 1:37 AM, Miszuda Amadeusz <miszuda at astro.uni.wroc.pl> wrote:
> Dear all MESA users,
> I’m fairly new in the MESA society, currently on the beginning of my PhD in Astrophysics.
> As one of my first tasks, to get familiar with MESA code, was to calculate a 2 solar mass star
> evolution from ZAMS.
> During calculations, I’ve noticed that star's position on PgPlot’s HR Diagram does not change 
> as it would be expected, but moves uniformly towards lower Teffs and luminosities. It stops only 
> at the point chosen to end calculations, in my case log_Teff_lower_limit=3.8
> Additionally, sometimes in code, i get a warning: hydro_newton_step failed to accept 
> Has anybody encountered such a problem?
> I run r10108, 10.12-20180127 SDK on 10.13.3 macOS High Sierra.
> I attach my inlist, a screenshot of PgPlot and a calculated path.
> Thank You for all the advices,
> Amadeusz Miszuda
> <job.rb>
> <history_m2.0_rot0.0_z0.01429_y0.2703_fh0.0_fhe0.0_fsh0.0_mlt0.5_sc0.1_reimers0.0_blocker0.0_.data>
> <Zrzut ekranu 2018-03-24 o 18.29.43.png>
> ---------------------------------
> Miszuda Amadeusz
> Astronomical Institute 
> Wroclaw University
> Kopernika 11 
> 51-622 Wrocław
> Poland
> www.astro.uni.wroc.pl
> miszuda at astro.uni.wroc.pl
> ————————————————
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users

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