[mesa-users] unsmoothed element abundance for MESA version of 6208

[Ehsan Moravveji]

Hi Tao,
Looking at /star/test_suite/1M_pre_ms_to_wd/inlist_1.0, then I find that 
      mesh_delta_coeff = 1.5
This gives you a very coarse mesh grid in the model, and is just good for a quick evolution of a model. However, from your email, I cannot see if you changed this or not.
So, take another look, and set it to something like 0.5 or less and retry. 
Let us know if that improves the meshing.

Best regards,
Ehsan 



On Jun 26, 2014, at 11:14 AM, WU T. wrote:

> Hi everyone,
> 
> I used the version of 6208 to calculated the stellar evolution with 1Msun masses and 0.02 metallicity and encountered a problem that the abundance of hydrogen varying with masses shows an unsmoothed phenomenon. This unformal phenomenon is durning main sequence stars to red giant branch stars (the position of red bump). After the position of red bump, the unformal phenomenon disappear. I don know what does lead to this phenomenon and how to solve this problem? Who did encounter this problem and can give some advice for it?
> 
> I adopted the module of 1M_pre_ms_to_wd and the inlist file as follows:
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> &star_job
> 
>       show_log_description_at_start = .false.
>       
>       !show_net_species_info = .true.
>       !show_net_reactions_info = .true.
> 
>       !create_pre_main_sequence_model = .true.
> 
>       save_model_when_terminate = .true.
>       save_model_filename = 'final.mod'
>       
>       write_profile_when_terminate = .true.
>       filename_for_profile_when_terminate = 'final_profile.data'
> 
>       kappa_file_prefix = 'gs98'
>       
>       change_lnPgas_flag = .true.
>       new_lnPgas_flag = .true.
> 
>       change_initial_net = .true.      
>       new_net_name = 'o18_and_ne22.net'
> 
>       pre_ms_relax_num_steps = 50
>       
>       new_surface_rotation_v = 2 ! solar (km sec^1)
>       set_near_zams_surface_rotation_v_steps = 10 ! to turn on rotation when near zams
> 
>       !pgstar_flag = .true.
> 
> 
> / ! end of star_job namelist
> 
> &controls
> 
>       max_model_number = 20000
> 
>       initial_mass = 1.0
>       initial_z = 0.02d0
>       
>       max_num_profile_models = 200
>       photostep = 10
>       profile_interval = 10
>       history_interval = 1
>       terminal_cnt = 10
>       write_header_frequency = 10
> 
>       log_L_lower_limit = -1
> 
>       smooth_convective_bdy = .true.                  
>       convective_bdy_weight = 1
> 
>       RGB_wind_scheme = 'Reimers'
>       AGB_wind_scheme = 'Blocker'
>       RGB_to_AGB_wind_switch = 1d-4
>       Reimers_wind_eta = 0.0!0.7d0  
>       Blocker_wind_eta = 0.0!0.7d0  
>       
> / ! end of controls namelist
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> Best wiehes!
> 
> Tao Wu
> 
> 
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