[Mesa-users] Rotation? I'm confused

[Francis Timmes]

> On Aug 18, 2022, at 1:21 AM, Amedeo Romagnolo <amedeoromagnolo at gmail.com> wrote:
> 
> Thanks Francis,
> 
> that was very helpful!!
> 
> I might have just few other questions, if you all don't mind:
> 
> 	• When I run your inlist, stop it and then change something, both ./clean and ./mk give the same error: " ./mk: line 13: cd: make: No such file or directory     make: 'hr' is up to date.", which I found out I can solve by deleting the "hr" file. May I ask you why this happens?


changing an inlist does not need a recompilation.
for compilation issues, perhaps check that $MESA_DIR or $MESASDK_ROOT are set correctly.

https://docs.mesastar.org/en/release-r22.05.1/installation.html#set-your-environment-variables

fxt





> 	• Look at the attached image: it's been two days that after the giant branch the star is evolving through the horizontal part of the HR diagram. It's not only about the timesteps, but also the amount of retries. Am I missing something? Is there a way to speed this up?
> Cheers,
> 
> Amedeo
> 
> On Wed, 17 Aug 2022 at 21:55, Francis Timmes <fxt44 at mac.com> wrote:
> hi amedeo,
> 
> i ran your case in r22.05.1. basically your time steps are too large
> to see the rotation profile after the model comes out of the relaxation phase.
> 
> 
> here it is coming out of the relaxation with the chosen 300 km/s value:
> 
>  finished doing relax uniform omega
> 
>         274   7.578688  3.879E+04   5.005055   5.005055  27.492684  27.492684   0.729398   0.002466   0.260000  -6.310560    662      6
>  0.0000E+00   7.578688   0.825322 -26.769229   3.862300  -6.975344   0.000000   0.260339   0.004623   0.010000   0.010911      3
>  3.0931E+04   0.599576   4.960043 -99.000000 -99.000000  -8.898918   0.000000   0.000093   0.001043   0.010263  0.000E+00        max_dt
>                           surf_avg_v_rot      300.9700879834308012
> 
> 
> and here it is after 1 timestep of 1 year:
> 
>        275   7.578685  3.879E+04   5.009550   5.009550  27.492684  27.492684   0.729398   0.002465   0.260000  -6.310569    662      6
>  0.0000E+00   7.578685   0.825308 -26.769371   3.866849  -6.976579   0.000000   0.260339   0.004623   0.010000   0.010911      3
>  3.0932E+04   0.599568   4.960038 -99.000000 -99.000000  -8.898900   0.000000   0.000094   0.001043   0.010263  0.000E+00        max_dt
>                           surf_avg_v_rot      299.9331797867811815
> 
> 
> the attached image shows the profile at this step 275.
> 
> surf_avg_v_rot evolves rapidly due to mass loss & angular momentum transport.
> attached is my minimally altered inlist_project.
> 
> fxt
> 
> 
> 
> 
> 
> > On Aug 16, 2022, at 12:40 PM, Amedeo Romagnolo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> > 
> > Hi all,
> > 
> > I have been trying for a while to understand how to properly implement rotation, but the way I did still bugs me.
> > 
> > Attached my inlist for a star of initial mass of 27.5 solar masses. I tried to set the initial rotation velocity at 300 km/s to study the internal mixing, but by looking at pgstar I got some doubts:
> > 
> >       • Why as soon as I apply the rotation near ZAMS (you can see it in the picture I attached) the stellar surface rotates at 52 km/s even if I set it at 300?
> >       • Did I implement rotation correctly? Is there another parameter I am missing?
> > Cheers,
> > 
> > Amedeo
> > <inlist_project><Initial_Rotation.png>_______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> > 
> 
> 
> 
> 
> 
> 
> <Grid2110630.png>