[mesa-users] ST

[Bill Paxton]

Hi Martin,

I've made the fixes so they'll be in the next release.  
I've also made a small addition to the comments that hopefully will clear up the mystery of 'am_D_mix_factor':

         !### am_D_mix_factor

         ! Rotation and mixing of material.
         ! `D_mix` = diffusion coefficient for mixing of material.
         ! It is sum of non-rotational and rotational components.
         ! The rotational part is multiplied by this factor.


Thanks,
Bill




On Jul 27, 2016, at 5:31 PM, Martin C. wrote:

> Hi all,
> 
> I have trouble with the 
> !am_log_nu_ST ! Spruit dynamo effective viscosity
> profiles output when am_nu_ST_factor < 0, in mesa version 8118.
> http://mesa.sourceforge.net/controls_defaults.html#am_nu_ST_factor
> 
> <image.png>
> 
> So I suggest
> 
> if (s% am_nu_ST_factor < 0) then
>     val = safe_log10_cr(prefact*s% D_ST_factor*if_rot(s% nu_ST,k))
> else
>     val = safe_log10_cr(prefact*s% am_nu_ST_factor*if_rot(s% nu_ST,k))
> end if
> 
> 
> Also, (separate issue)
> should this be D_ST, not nu_ST?
> <image.png>
> http://mesa.sourceforge.net/controls_defaults.html#am_D_mix_factor
> 
> BTW what is am in am_D_mix_factor? Angular momentum? What does that have to do with D_mix? Sorry if dumb question.
> 
> Thanks
> 
> Martin
> -- 
> Martin C.
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