[Mesa-users] Timestep issues

[AbdelBassit Senhadji]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20211203/1a3ab02f/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Figure.pdf
Type: application/pdf
Size: 20422 bytes
Desc: Figure.pdf
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20211203/1a3ab02f/attachment.pdf>