[mesa-users] convergence problem

[Aaron Dotter]

Hi Ehsan,

The reason for failure during the create pre-MS model can be a function of
what the initial mass is.  The initial_mass parameter is not set in the
inlist you attached.  However, my experience with lower mass stars (say
M_init < 2 Msun) is that you can obtain better results by setting a higher
central temperature in your star_job inlist:


      pre_ms_T_c = 3e5 ! initial center temperature (below 1d6)

The default is 3e5 but you can try values <= 1e6.  So try 5e5, 7e5, and so
on.

Aaron



On Thu, Oct 18, 2012 at 7:34 AM, Ehsan Moravveji <moravveji at iasbs.ac.ir>wrote:

> Hello MESA users,
> I get this convergence error when setting create_pre_main_sequence_model
> to true. Does anybody have an experience unscrewing this sort of issues?
>
> ehsan:alfHer-new ehsan$ ./rn
> DATE: 2012-10-17
> TIME: 21:36:27
>  saved initial &star_job inlist values: star_job_namelist.out
>                                          version_number        4589
>  read inlist_fixed_params
>  read inlist_diffusion
>  read inlist_multimass_alf1Her
>  create pre-main-sequence model
>
>                                         relax_num_steps
>
>                    1st model retry: new log10 dt/secyer
> -5.5000000000000000D+00
>                    1st model retry: new log10 dt/secyer
> -7.8010299956639813D+00
>  first model is slow to converge: num tries          70
>  first model is slow to converge: num tries          80
>  first model is slow to converge: num tries          90
>  first model is slow to converge: num tries         100
>  first model is slow to converge: num tries         110
>  first model is slow to converge: num tries         120
>  first model is slow to converge: num tries         130
>  first model is slow to converge: num tries         140
>  first model is slow to converge: num tries         150
>  first model is slow to converge: num tries         160
>  first model is slow to converge: num tries         170
>  first model is slow to converge: num tries         180
>  first model is slow to converge: num tries         190
>  first model is slow to converge: num tries         200
>  first model is slow to converge: num tries         210
>  first model is slow to converge: num tries         220
>  first model is slow to converge: num tries         230
>  first model is slow to converge: num tries         240
>  first model is slow to converge: num tries         250
>  first model is slow to converge: num tries         260
>  first model is slow to converge: num tries         270
>  first model is slow to converge: num tries         280
>                    1st model retry: new log10 dt/secyer
> -1.0704119982655925D+01
>  first model is slow to converge: num tries         260
>  first model is slow to converge: num tries         270
>
>  stopping because of convergence problems -- too many backups
>
>
>
>
>
>                                finished relax_num_steps
>
>  failed in do_relax_num_steps
>  star_create_pre_ms_model ierr          -1
>
>  do_load1_star ierr          -1
>
> DATE: 2012-10-17
> TIME: 21:39:13
> ehsan:alfHer-new ehsan$
>
> Turning off the create_pre_main_sequence_model will solve my problem, but
> this is not what i want. The inlist is attached.
> I am at version 4589 (the latest+SKD), and run with over 12 nodes on a
> 64bit Linux cluster.
> Thanks for your concern.
>
> Ehsan.
>
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