[mesa-users] Fixed rate accretion onto WD with full structure

[Robert FARMER]

Hi
If you look at your terminal output you should see a string at the end of
the parameters in the dt_limits section. This string is telling you why
mesa is limiting the timestep. Then you can look that string up in the
controls.defaults file which  will tell you what parameter you can chnage
to make mesa less sensistive to that control and thus take a larger
timestep.

Rob

On Wed, May 20, 2015 at 8:55 AM, Manos Chatzopoulos <
manolis at flash.uchicago.edu> wrote:

> Dear all,
>
>  I am setting up a relatively simple MESA problem where I want to accrete
> mass at a constant rate (1d-9 Msun/yr) onto a white dwarf. I know there are
> numerous binary test_suite problems that deal with accretion onto a WD as a
> point mass, but in my case I want to include the full
> structure of the WD in the calculation because I want to see how several
> parameters change (including angular momentum profile) as mass
> is accreted. The problem I am dealing with is that the time-step becomes
> tiny after a few time-steps not allowing me to complete a full
> simulation for ~ 1bn years. That only happens when I accrete mass onto the
> WD at a rate higher than ~ 1d-14 Msun/year. I need to use
> a rate of 1d-9 Msun/year, however. I am using the "final.mod" WD profiles
> from the test_suite problem agb_to_wd and wd_cool to start
> the calculation. An example model and inlist (and profiles_columns.list)
> are attached. I am using the latest version of MESA (7503).
>  Any help on this would be appreciated. Thank you very much for your time!
>
> Best,
>
> Manos
>
> --
> Dr. Emmanouil Chatzopoulos
> Enrico Fermi Postdoctoral Fellow
> Department of Astronomy & Astrophysics
> FLASH Center for Computational Science
> University of Chicago
> https://www.linkedin.com/pub/manos-chatzopoulos/a1/688/a03
> https://astro.uchicago.edu/people/manos-chatzopoulos.php
>
>
>
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