[Mesa-users] Timestep issues

[AbdelBassit Senhadji]

Hi Francis,

Sorry for the late reply. I am evolving M1 = 5.5Msun for the donor and M2 = 3.79Msun for the companion. I evolved the system until the M1 filled the RL and became a WD. The secondary at that time had  a mass = 6.9 Msun, I applied high winds to strip all that mass from the secondary to get that secondary fills the RL while it is still a He burning star.

>From the HR diagram I attached, it is clear that something is wrong with my timestep. I also attached the inlists I am using. Which timestep I should change to get rid of these spikes and have a smooth evolution? The list of timesteps on MESA Sourcefouge is big and did not know which one I should change.


Thanks
Abdel

________________________________
De : Francis Timmes <fxt44 at mac.com>
Envoyé : 4 décembre 2021 16:13
À : AbdelBassit Senhadji <sen-abd at hotmail.fr>
Cc : Frank Timmes <fxt44 at mac.com>; mesa-users <mesa-users at lists.mesastar.org>
Objet : Re: [Mesa-users] Timestep issues

hi abdel,

this is not enough information for anyone to potentially help.
what is being modeled? what is the inlist?

mesa's time step controllers are described at
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.mesastar.org%2Fen%2Flatest%2Freference%2Fcontrols.html%23timestep-controls&data=04%7C01%7C%7C3f2f11127c314dfb8d4008d9b76aeba3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637742492111486903%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=tH2%2FPDCEPhY8jNJAtyiP582EykpJYYJwtGbLEI0Dhv8%3D&reserved=0

fxt






> On Dec 3, 2021, at 3:45 PM, AbdelBassit Senhadji via Mesa-users <mesa-users at lists.mesastar.org> wrote:
>
> Hi MESA users!
>
> I am using the last version of MESA SDK with mesa-r15140. I am getting some issues with the time step and this is one of the errors:
>
> 563D-01
>  retry: max resid -- give up in solver    3425
>  retry: logT > hydro_mtx_max_allowed_logT    3425
>                   max_residual > tol_max_residual*coeff        3425    9.0476669018875888D-06    2.3009034825276050D-06    2.3009034825276048D-01
>  retry: max resid -- give up in solver    3425
>  retry: logT > hydro_mtx_max_allowed_logT    3425
>                   max_residual > tol_max_residual*coeff        3425    9.0476677124568281D-06    2.3009027348566796D-06    2.3009027348566796D-01
>  retry: max resid -- give up in solver    3425
>  retry: logT > hydro_mtx_max_allowed_logT    3425
>                   max_residual > tol_max_residual*coeff        3425    9.0476661055005185D-06    2.3009040350088826D-06    2.3009040350088825D-01
>  retry: max resid -- give up in solver    3425
>                                                      dt    7.9272836255228435D-07
>                                      min_timestep_limit    9.9999999999999995D-07
>
>  stopping because of problems dt < min_timestep_limit
>
>  retry: logT > hydro_mtx_max_allowed_logT    3425
>                                                      dt    7.9272836255228435D-07
>                                      min_timestep_limit    9.9999999999999995D-07
>
>  stopping because of problems dt < min_timestep_limit
>
>                   check_rel_error_in_energy delta_value                       NaN
> STOP check_change
> DATE: 2021-12-03
> TIME: 17:30:34
>
> ****************************
>
>
> The commands I use in the control settings were:
>
>    time_delta_coeff
>     delta_HR_limit
>     delta_HR_hard_limit
>
>
> Any suggestion or recommendation on how to better control the timestep. I also attached the HR diagram I am having and want to have the evolution smoother without the spike lines.
>
> Thanks for your help!
> Abdel
>
> <Figure.pdf>_______________________________________________
> mesa-users at lists.mesastar.org
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.mesastar.org%2Fmailman%2Flistinfo%2Fmesa-users&data=04%7C01%7C%7C3f2f11127c314dfb8d4008d9b76aeba3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637742492111486903%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=oD1964UfOccAZfgF4txCZd74SjqQpceOxiVHPrbAO7I%3D&reserved=0

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