[mesa-users] dynamo effect on stellar str

[Valery Pipin]

Dear Bill,


> Hi Valery,
>
> I don't think the necessary "hooks" for you are in mesa at the moment, but I'm happy to add some once we decide what you'll need.  Could it be as simple as providing vectors giving cell-by-cell extra pressure and extra diffusion coefficients for mixing of composition?
This is a good solution.
>   If so, I can give you a private release quickly to let you give it a try.  Your extra code will go in your "run_star_extras" file where you will define a couple of routines to be called at each step from inside mesa to set the extra pressure and mixing diffusion coefficient at each zone in the model according to the current radius of the zone and any other information in the star data structure.  There are tutorials on-line for how to use run_star_extras as has been mentioned in previous emails.
Thanks! I will look at it

Best regards!
'Valery



> Cheers,
> Bill
>
>
> On Jul 28, 2016, at 7:31 PM, Valery Pipin wrote:
>
>> Dear  List,
>>
>> I wonder if MESA has a possibility to check effects of large-scale
>> magnetic field and flow on the stellar structure.
>>
>> I have computed a set of nonlinear dynamo models. They include the 3D
>> mean-field dynamo coupled with angular momentum balance and heat transport.
>>
>> The model use the reference thermodynamic  structure of a star 0.3Ms of
>> age 1Gyr  which was computed with help of MESA using the solar composition.
>>
>> The equation for the mean-field heat transport was solved for
>> perturbation of the mean entropy caused by effects of the global
>> rotation and magnetic field.
>>
>> In 1D stellar structure code the effect of mixing due to meridional
>> circulation can be treated as an addition to diffusion and effect of
>> magnetic field via the averaged addition to pressure.
>>
>> Both factors vary along the radius. Can I add them to the code and in
>> what place. I would appreciate if you have some example.
>>
>> The test suite contains example for 15M star with dynamo. I don't
>> understand where parameters of the magnetic field are defined?
>>
>> Thanks
>>
>> Valery
>>
>>
>>
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