[Mesa-users] Time Resolution Convergence Testing in MESA 12778

[Nicholas Herrington]

Hi Rob and Thomas,

Thank you for the suggestions I will look into these.

Nick

—
PhD Student
University of Exeter
Nicholas Herrington
Nicholas.herrington at myport.ac.uk



> On 19 Jan 2022, at 11:20, Rob Farmer <robert.j.farmer37 at gmail.com> wrote:
> 
> Hi,
> You're correct, previous versions of MESA dont have time_delta_coeff. You'll need to look at mesa's other timestep controls control.defaults timestep-controls section.
> 
> Note that mesh_delta and time_delta are both hammers; they are designed to make it simple to change the resolution but in both cases there are many other options to do more fine tuned changes in resolution.
> 
> If you want to stop pulsations try setting pextra_factor=4 to apply extra pressure at the surface.
> 
> Rob
> 
> On Wed, 19 Jan 2022 at 11:55, Nicholas Herrington via Mesa-users <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>> wrote:
> Hi all,
> 
> I am using mesa version 12778 and I have been encountering some issues with my models, so I am testing the time stepping to how this effects the issues. I see on the MESA website that varcontol_target changes the differences in the structure variables between models but it states not to use this for time resolution convergence testing, rather use time_delta_coeff instead. When testing this, MESA will not run as it does not recognise this control, I presume this is because I am using an older version. Is there a similar control to this or any recommended way of time resolution convergence testing in the version of MESA I am currently using.  
> 
> Problem context: I am running a series of rapidly accreting pop III supermassive stars and I am currently trying to understand, by reducing the timestep, when the difficulties first emerge in the runs. I suspect these are issues resulting from pulsations as a result of the TOV approximation that is applied to these stars.
> 
> Thanks
> Nick
> 
> --
> PhD Student
> University of Exeter
> Nicholas Herrington
> Nicholas.herrington at myport.ac.uk <mailto:Nicholas.herrington at myport.ac.uk>
> 
> 
> 
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