[mesa-users] High Rotation Stellar Model Issues

[Jakub Ostrowski]

Additionally to Pablo’s suggestions I’d suggest increasing time and (especially) spatial resolution of your models. Try playing with mesh settings (http://mesa.sourceforge.net/controls_defaults.html#mesh_adjustment <http://mesa.sourceforge.net/controls_defaults.html#mesh_adjustment>) because it certainly helps with convergence.

Jakub


> On 17 Oct 2016, at 13:40, Ethan Payne <epay1 at student.monash.edu> wrote:
> 
> 
> 
> On 17 October 2016 at 22:20, Pablo Marchant <pamarca at gmail.com <mailto:pamarca at gmail.com>> wrote:
> Hi Ethan. First, I'd strongly recommend you use the Ledoux criterion with overshooting and semiconvection turned on.
> 
> If your star is evolving to critical rotation, it is likely that the source of your problems is the wind mass loss enhancement due to rotation. This is because by default mass loss rates go to infinity at critical rotation. To correct for this, you can use the implicit wind scheme, which iterates a step while adjusting the mass loss rate until the model remains below a threshold in omega/omega_crit. To turn this on, you can set
> 
> max_mdot_redo_cnt = 50
> 
> Look for this option in 
> 
> http://mesa.sourceforge.net/controls_defaults.html#mass_gain_or_loss <http://mesa.sourceforge.net/controls_defaults.html#mass_gain_or_loss>
> so that you understand what is being done.
> 
> Thank you, I'll implement both. And that would make sense as to what is occurring, thank you. 
> Also, any reason for you to turn on the option for the hydrodynamics term? This is what the v_flag does, and of course, if you want to resolve any stellar dynamics you need timesteps well below a century.
> 
> Sorry, this was an outdated inlist, however, the problem was still present there. Sorry about that. However, thank you so much for your help! 
> 
> Regards,
> 
> Ethan Payne 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20161017/4b4b16c1/attachment.html>