[Mesa-users] Rotation? I'm confused

[Francis Timmes]

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
> 



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