[mesa-users] Prevention convergent problem on helium flash

Frank Timmes fxt44 at mac.com
Wed Dec 14 23:28:48 EST 2016

in short, mesa uses an implicit finite volume scheme with adaptive mesh refinement 
and sophisticated timestep controls. a special solution methodology is not 
used to get through the helium flash. aspects of mesa's solution method are 
described in the instrument papers with the first two being relevant


plus you can look at the code.


> On Dec 14, 2016, at 7:54 PM, 熊赫然 <xiongheran at ynao.ac.cn> wrote:
> Hello every one MESA users:
>      I want to know how does MESA handle the convergent problem on He flash process. I had used other star evolution code and it stops on He flash, because the extreme increasing in Helium burning energy leads to a convergent problem: The finite-difference method is not convergent here, and Taylor's series expansion is not applicable to this kind of extreme change.  So i want to know which kind of numerical solution using in MESA that can prevent this convergent problem?
> --
> Heran XIONG
> Yunnan Observatories, Academia Sinica 
> Phoenix Mountain, East Suburb 
> Kunming, 650011 
> P.R. China 
> Tel. +86-0871-67381984 (Office)      
>      +86-18501150931 (Mobile)
> Fax: +86-871-63920599 
> E-mail: xiongheran at ynao.ac.cn 
>                                                                                                                                                          Sincerely, 
>                                                                                                                                                          Heran, Xiong
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