[Mesa-users] convergence problems of a white dwarf post entropy relaxation

[Akaash Conhye]

Hi all,

I'm trying to relax the entropy profile of a white dwarf from 3d hydrodynamic simulations (which used a helmholtz EOS without colomb corrections) but i run into convergence problems once the white dwarf has relaxed and begins its first real time evolution step. the white dwarf has a nickel-56 envelope and the star has a total mass of 0.6 solar masses. The terminal output is shown at the end.

I started by first relaxing the composition profile, saving this model, then relaxing entropy afterwards. the relative error I have is ~0.1526. The template im using is wd_cool_0.6M. It could be that I have some obvious improper physics in my inlist so I've attached a copy of it. the things ive tried to change are available to see on "inlist_wd_cool_0.6M" (my changes are denoted with !!, single ! are default comments) but if you find this distracting, I've also attached a copy of the inlist without the comments named "inlist_wd_cool_0.6M_uncommented".
...
Terminated relax because of max_model_number instead or relax_time
 net name approx21.net
 use_gold_tolerances T
 do_element_diffusion T
                                      atm_option: T_tau
 species
     1   neut
     2   h1
     3   prot
     4   he3
     5   he4
     6   c12
     7   n14
     8   o16
     9   ne20
    10   mg24
    11   si28
    12   s32
    13   ar36
    14   ca40
    15   ti44
    16   cr48
    17   cr56
    18   fe52
    19   fe54
    20   fe56
21   ni56

 kappa_file_prefix gs98
 kappa_lowT_prefix lowT_fa05_gs98
                                        OMP_NUM_THREADS          16


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terminated evolution: dt_is_zero

termination code: dt_is_zero
DATE: 2020-11-27
TIME: 18:47:38


Thanks for your help,

Akaash


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