[Mesa-users] [mesa-users] post-MS low mass stars

[Warrick Ball]

Hi Amedeo,

I noticed this in your inlist:

     time_delta_coeff = 1d2

I can't easily think of a reason why we'd want this to be > 1.  Can I ask why you increased this to such a large value?  Or did you mean for it to be 1d-2?

If short timesteps are an issue, it's better to look at the terminal output for each step (or the relevant history column; I presume there is one) to see what is limiting the timestep.  You can then relax that particular control or try to debug why it's becoming a limiting factor.

Another thing to do is try removing some of the non-default controls you use, like convective premixing, to see how that affects the run.

That is, try steadily reducing your inlist to the standard work folder and see what suddenly allows evolution to proceed as you expect.

Similarly, you can try starting from the standard work folder again and steadily adding your controls one by one to see which one slows the run down.

Regards,
Warrick


___________

Warrick Ball
Senior Research Software Engineer
University of Birmingham
W.H.Ball at bham.ac.uk

On Sun, 10 Dec 2023, Amedeo Romagnolo via Mesa-users wrote:

> CAUTION: This email originated from outside the organisation. Do not click links or open attachments unless you recognise the sender and know the content is safe.
> Hi all,
> 
> I wanted to see how to evolve low-mass stars. Since I am more used to massive stars I had to tweak my models a bit to make them work, but I cannot yet figure out how to not get stuck in the Hertzsprung gap. 
> As a reference, with my setup the MS takes about a minute to complete, but my pc could instead compute the HG for hours.
> 
> Here attached my inlist. Any idea how to speed this up?
> I mean, I could play with the resolution, but isn't my resolution low enough?
> 
> Cheers and thanks,
> 
> Amedeo
> 
>