[mesa-users] Robert Farmer's December 2016 Paper

[Robert Farmer]

Hi Ian

Can you send me the inlists you've used with your modifications? I've just
tried myself with 8845 and the model goes slow but because of the
varcontrol rather than the hydro failures with your logs show.

delta_HR_limit is based on sqrt(delta_logT**2+delta_logL**2) ie the motion
on the HR track.

Rob


On Wed, Jan 11, 2017 at 5:54 PM, Ian Foley <ifoley2008 at gmail.com> wrote:

> Hi,
>
> I have tried to use the inlist's that Robert Framer has supplied to run
> the outputs in his paper. I am using r8845, not r7624 so had to make some
> minor changes
>
> Need help because cannot get past the pre_ms stage.
>
> Around step 70, the luminosity starts to go high, the central temperature
> drops and the timesteps become small eventually causing program to stop. I
> have tried many variations to the inlists without being able to overcome
> this and I am not sure why this is happening.
>
> In addition, it is puzzling to me how the "delta_HR_limit = 0.0025d0" will
> work as we are not on the main sequence yet and this inlist entry forces
> small timesteps in the pre_ms stage.
>
> I have encountered this problem before and it seemed to be related to a
> problem with the reaction net.
>
> I have run the inlists with two approx 21 nets
>
> new_net_name = 'approx21_plus_co56.net'
> new_net_name = 'approx21_cr60_plus_co56.net' (Used by Robert Farmer)
>
> They both failed, but the terminal outputs are distinctly different making
> me think that the reaction net is having quite an impact. Or has this to do
> with the fact that I am using a later release? Or perhaps something else -
> like I'm doing something wrong.
>
> My goal in looking at this is to try to find a way for the Si burning
> stage to complete with fewer timesteps and so complete quicker. I thought
> Robert's inlists might give some good clues, but I am stuck at the pre_ms
> stage.
>
> I have attached the terminal outputs from the above two nets.
> 15M.txt is for 'approx21_plus_co56.net'
> 15M1.txt is for 'approx21_cr60_plus_co56.net'
>
> Kind regards
> Ian
>
>
>
>
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