[mesa-users] changes in spatial and temporal resolution in MESA

[Subedi, S. K. <ss3...@oh...>]

Dear All!


Currently I have been using MESA version 7624 to study the explosive nucleosynthesis phenomenon in Core-Collapse Supenova (CCSN). For this I have been using the explosive nucleosynthesis inlists provided in the MESA III Instrument Paper Inlists. I now wish to do the convergence tests changing the spatial resolution and temporal resolution in the inlists.


I have an idea that in order to investigae the changes in spatial resolution, we need to make changes in the values of the 'mesh_delta_coeff' in all of the 5 inlists provided i.e. inlist_remove_core, inlist_adjust, inlist_edep, inlist_explosion and inlist_massive_defaults. But when I go into individual inlists I find following statements of the 'mesh_delta coeff' and I'm not sure which of them should I change? I am also curious to know about the choice of the values of the mesh_delta_coeff values below.


Inlist_adjust:

                      mesh_delta_coeff_for_highT = 1.4


Inlist_remove_core:

                      mesh_delta_coeff_for_highT = 1.4


Inlist_explosion:

                        mesh_delta_coeff = 0.8


Inlist_massive_defaults:

                        mesh_delta_coeff = 1.5
                       mesh_delta_coeff_for_highT = 2.5
                       logT_max_for_standard_mesh_delta_coeff = 9.0
                        logT_min_for_highT_mesh_delta_coeff = 9.5

In addition, In order to change the spatial resolution, is it only the 'varcontrol_target' that we need to change? I am confused when I look into the inlist_explosion of MESA Summer School 2015 Minilab 2 (simulating supernova explosions and nucleosynthesis) exercise where it provides following set of timestep controls varriables.

varcontrol_target = 1d-3
min_timestep_limit = 1d-10

I'm not sure what's the role of 'min_timestep_limit' here?

Also, in order to make the supernova explosion to work, I had to make following change in the 'solver controls' section in  'inlist_explosion' of the MESA III Instrument Paper Inlists.
I replaced 'use_time_centering = .true. '  by 'use_energy_coversion_form=.true.'.
I am not sure what are the roles of each of above parameters and if its the right way to undergo the supernova explosion in MESA?

I'd really appreciate if anyone could provide his/her useful suggestions and guidance.

Sincerely,
Shiv Subedi
Graduate Student
Ohio University
Athens, Ohio