[Mesa-users] Mass Loss Time steps

[Frank Timmes]

hi shaquann,

> ... what establishes the evolution time_steps when mass loss is on ...

many physical and numerical quantities can limit/control the timestep that mesa selects

https://docs.mesastar.org/en/24.08.1/reference/controls.html#timestep-controls

including quantities such as mass loss

https://docs.mesastar.org/en/24.08.1/reference/controls.html#mass-gain-or-loss .


> ... best practice to change it ...

by watching the terminal output 

https://docs.mesastar.org/en/24.08.1/using_mesa/running.html#run-mesa

one can get an idea of what is controlling the timestep. in this example, the last field in the third row is "dt_limit", which has the correspond text entry "max increase" meaning mesa is making the timestep as large as possible given the timestep controls above. in your case the dt_limit text will probably be different, but will say what is currently controlling the timestep. with this info you can then experiment with changing the relevant timestep and/or mass loss controls given above. 

another best practice is sharing one's inlist(s) in case a mesa-user wanted to look at them to potentially offer guidance. 

fxt





> On Sep 17, 2024, at 12:27 PM, Shaquann Seadrow via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hi all, 
> 
> I wanted to know if anyone could explain what establishes the evolution time_steps when mass loss is on, and the best practice to change it (in my case increase it). 
> 
> I am using version r23.05.1. I am currently evolving a 40 solar mass model with a Vink scaling factor of 0.6. As of now, the model is evolving at log (dt) ~ 2.4. 
> 
> Thank you in advance, 
> 
> Shaquann
> 
> -- 
> Shaquann S. Seadrow
> PhD. Candidate
> Dept. of Physics & Astronomy
> University of Delaware
> 
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