[Mesa-users] entropy relaxation skipped

Akaash Conhye ac01283 at surrey.ac.uk
Wed Dec 16 13:13:58 EST 2020

Hi Francis,

Removing this max_model_number line allows for proper time evolution to occur i.e. the white dwarf goes about its cooling. This line is something I found in the relax_composition_j_entropy template on the test suite. It is a means to stop the simulation right when relaxation finishes, at least as far as I know. The entropy relaxation process is just skipped over after a few retries and backups when the line is removed. This is precisely what I find quite strange.


From: Francis Timmes <fxt44 at mac.com>
Sent: 16 December 2020 14:01
To: Conhye, Akaash (UG - Physics) <ac01283 at surrey.ac.uk>
Cc: Frank Timmes <fxt44 at mac.com>; mesa-users <mesa-users at lists.mesastar.org>
Subject: Re: [Mesa-users] entropy relaxation skipped

the run is terminating as instructed:

> stop because model_number >= max_model_number

try setting max_model_number to a larger value in your inlist(s).


> On Dec 16, 2020, at 6:13 AM, Akaash Conhye via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> Hi all,
> I'm trying to relax composition and entropy for a white dwarf model. The profiles come from hydrodynamic simulations with a Helmholtz EOS without coulomb corrections.
> composition relaxation occurs just fine. However, my problem is entropy relaxation. In the terminal output file I've attached, MESA tries a few times with entropy relaxation and gives up instead of the usual timescale reduction to the minimum timestep. Does anyone know why this might be occurring?
> Also attached is a comparison of the entropy profiles pre-relaxation (default) post relaxation (relax363) and the target profile (from hydro simulation)
> Thanks,
> Akaash
> <relax363_s_and_mu_no_initial_dt_max_dt_s_1d0_mlt_cox_mesh_coeff_0.5_timescale_default_eddington_t_tau_iterated.out><sprofile_default_relax363_hydro_loglog.png>_______________________________________________
> mesa-users at lists.mesastar.org
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.mesastar.org%2Fmailman%2Flistinfo%2Fmesa-users&data=04%7C01%7Cac01283%40surrey.ac.uk%7C726c5d348f2b4d3d31c208d8a1cb26c2%7C6b902693107440aa9e21d89446a2ebb5%7C0%7C0%7C637437241188199657%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=NfuXykXuLCuGFCq%2BEbFJT%2FCthWojEgoE3s8L12ThyJ0%3D&reserved=0

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