[Mesa-users] Difficulty producing models using example_make_pre_ccsn inlists

[Jared Goldberg]

Hi Jake,

I've run into the same problems when using revisions 11000 and
greater. Unfortunately, there isn't a simple solution in the current MESA
revision. Turning off gold tolerances helps, and sometimes reverting to the
old EOS options (use_eos_DT2 = .false. and use_eos_ELM = .false.) helps
sometimes. If that doesn't work or if you don't want to turn off gold
tolerances and/or you don't want to revert back to using 10398 for the
progenitor models, I recommend looking at/adopting Frank Timmes's inlist
parameters from the mailing list back in February/March 2020 (Ermal's
thread, [Mesa-users] Failed to produce type II supernova progenitor with
mesa 12115) for your pre-core-collapse models in 12115.

Hope this helps,
~Jared

On Sun, Jun 28, 2020 at 2:44 PM Jake Nicoll via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi all,
>
> I am using the example_make_pre_ccsn and example_ccsn_IIp test suites in
> the 12778 version of mesa (with the SDK released on March 1, 2020) in order
> to model SNe light curves. I think I am having more problems than I would
> expect to have in generating models using the example_make_pre_ccsn test
> suite inlists.
>
> For example, I ran the example_make_pre_ccsn inlists for a star of 14
> solar masses with omega/omega_crit = 0.2, Z=Z_base=0.02, and eta_wind=1.0.
> The inlist_common where I set these parameters is attached. All other
> parameters are left as the defaults. I receive the following error while
> running inlist_to_si_burn:
>
> stopping because of problems dt < min_timestep_limit
>
> I have tried lowering the minimum time step by several orders of
> magnitude, which does not fix the problem.
>
> However, these input parameters were used by Ricks and Dwarkadas to
> produce a model for the 1999em SN. They used the 10398 version of the code,
> so I ran the same input parameters in the 10398 version (using the 10398
> SDK released August 22, 2018) and successfully produced a model.
>
> I am not sure what changed in the code that is now causing this dt error.
> One obvious change is that there was no inlist_to_si_burn in the 10398
> version's example_make_pre_ccsn. This inlist saves a model once the core
> reaches a si28 mass fraction of 0.4. (I think) I should expect this mass
> fraction to be achieved by a star with the initial mass I am considering,
> so I am not sure why this inlist fails to produce a model.
>
> Best,
> -Jake Nicoll
> _______________________________________________
> mesa-users at lists.mesastar.org
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>
>
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