[Mesa-users] Does it need to consider convection when relaxing entropy?

[曾耀田]

Dear Rob,

Thanks for your help!

Following your suggestion, Let the model takes some time (about 1d-3yrs for my cases) to re-reach an equilibrium, the luminosity spikes disappear.

With best wishes,

Yaotian Zeng
  
  

-----Original Messages-----
From:"Rob Farmer" <r.j.farmer at uva.nl>
Sent Time:2020-09-07 20:07:51 (Monday)
To: "曾耀田" <zengyaotian at ynao.ac.cn>
Cc: mesa-users <mesa-users at lists.mesastar.org>
Subject: Re: [Mesa-users] Does it need to consider convection when relaxing entropy?


Hi,
>Couldyou tellme howtodeterminethattherelaxingprocessissuccessful?



For the composition you can look for the string " done relax_composition" in the terminal output. For the entropy case, its a little trickier but again if you look in the terminal output you'll see the model number resets back to 1. Have a look at the few lines before that and you'll see no error messages. So the relax routines have worked for you.


>Andtheage_yrnolonger increasestoabout4d47yrsinthecase_2andcase_3.


That looks like it happens because your case 2 and 3 are working after the relax process, so the age in the output files is reset to a sensible number. In case 1 your model crashes shortly after the relax process, probably before it can overwrite the history data. Thus your age gets left with the garbage value that's used during the relax_compoisition and thus should not be trusted.





>Manypeaksare shownontheluminosityprofile eventheendof the relaxingprocessincase_1butsomeofthem are notshownincase_2andcase_3.



Those don't look great but a) they look like maybe 1-2 zones are perhaps wrong and b) your star has just been violently rearranged it can take time to get back into equilibrium. Also looking at the run.log it looks like the star finished the relax process so have a look at those plots instead of the relax ones to see if the luminosity spikes are there.



If you look at the timestep after the relax process it's very small, but your case 2 and 3 are working. It will take time for the model to re-reach an equilibrium and you've not  even given it 1 second yet, so maybe let the model run and see if the luminosity spikes disappear.



Rob












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