[mesa-users] How to use other_D_mix?

[Chris Mankovich]

Hi Ehsan,

Just modifying s% D_mix is the way it's supposed to work, and it has in the
past.  I'm curious so I did a much simpler test:

      subroutine test_other_D_mix(id, ierr)
         integer, intent(in) :: id
         integer, intent(out) :: ierr
         type (star_info), pointer :: s
         ierr = 0
         call star_ptr(id, s, ierr)
         if (ierr /= 0) return

 s% D_mix(:) = 1e20

      end subroutine test_other_D_mix


This works as expected.

We might need to see your full routine to judge whether v_diff * s% r(k) is
really a macroscopic quantity.  If you're getting v_diff from MLT, then
naturally it's zero in regions for which MLT was never called.

Chris

On Sun, Mar 1, 2015 at 6:16 AM, Ehsan Moravveji <e.moravveji at gmail.com>
wrote:

> Dear MESA users,
> I am trying to plug in an ad-hoc linear diffusive mixing coefficient,
> through using other_D_mix; however, I have little progress, since I don't
> get what I expect!
> So, typical, right? :-)
>
> In brief, I use v.7385, and set use_other_D_mix to .true. in my inlist.
> Also, I set
>          s% other_D_mix => Change_D_mix
> in extras_controls(). In the latter procedure, I have the following simple
> do loop:
>
>          do k = 1, nz
>             ok_to_mix = .false.     ! reset to default at each mesh
>             ok_to_mix = ((s% mixing_type(k) > softened_convective_mixing)
> .or. &
>                          (s% mixing_type(k) == 0))
>             if (.not. ok_to_mix) cycle
>
>             s% D_mix(k) = D_0 + v_diff * s% r(k)
>             s% D_mix_non_rotation(k) = s% D_mix(k)
>             print*, k, s% D_mix(k)
>          enddo
>
> With the print statement, I just make sure that this procedure works, and
> some mesh points, k, that are not convective, overshooting and softening
> are correctly selected to tweak s% D_mix(k). The printed value of D_mix
> that I want to set is also OK. However, when I plot the profile of
> log_D_mix and log_D_mix_non_rotation, I cannot see the envisaged increasing
> linear trend in radiative parts of the model. A plot is attached.
>
> Digging and "grep"ing in star/private/mix_info.f90 also did not take me
> any further.
> So, my question is: Which of the star_info variables are allowed to be
> changed through other_D_mix procedure?
> How can I see what I expect? ;-)
>
> Kind regards
> Ehsan
>
>
>
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