[Mesa-users] do_element_diffusion = .false. != diffusion_class_factor(:) = 0

[Earl Bellinger]

Ah that makes good sense, thanks!

Best regards,
Earl


On Thu, Dec 14, 2017 at 8:00 PM, Aaron Dotter <aaron.dotter at gmail.com>
wrote:

> Hi,
>
> If you ever need to check what's going on "under the hood" with &controls,
> there is the option to
>
> write_controls_info_with_profile
>
> which will dump the controls namelist into a file of your choosing.  This
> happens every time a profile is written but would still be useful for
> checking in this case.
>
> Aaron
>
> On Thu, Dec 14, 2017 at 1:47 PM, Evan Bauer <ebauer at physics.ucsb.edu>
> wrote:
>
>> Hi Earl,
>>
>> It looks like your inlist command is only setting the first class factor
>> to 0. That is
>>         diffusion_class_factor(:) = 0
>> somehow only gets diffusion_class_factor(1) and leaves the rest of them
>> untouched. Since the default number of diffusion classes is five, I think
>> your inlist needs
>>         diffusion_class_factor(1) = 0
>>         diffusion_class_factor(2) = 0
>>         diffusion_class_factor(3) = 0
>>         diffusion_class_factor(4) = 0
>>         diffusion_class_factor(5) = 0
>>
>> Somebody who understands fortran namelists better than me can probably
>> explain exactly why this is happening, but hopefully the above is an
>> adequate solution.
>>
>> Cheers,
>> Evan
>>
>>
>> > On Dec 14, 2017, at 3:58 AM, Earl Bellinger <bellinger at mps.mpg.de>
>> wrote:
>> >
>> > Dear mesa-users,
>> >
>> > I am wondering if someone can help me to understand why turning off
>> > element diffusion yields a different result than setting the diffusion
>> > factor to 0? I would expect, perhaps naively, for them to yield the
>> > same result.
>> >
>> > Some simple inlists are attached for calculating the first Gyr of
>> > evolution for a solar mass track. There's a small difference in
>> > several quantities, for example the effective temperature changes from
>> > 5643.763 to 5643.913. This is somewhat different from running it with
>> > diffusion class factor of 1, which gives Teff of 5643.915.
>> >
>> > Best regards,
>> > Earl Bellinger
>> >
>> > ---
>> > earlbellinger.github.io
>> > Earl Bellinger, Ph.D. Candidate
>> > Stellar Ages & Galactic Evolution Group
>> > Max Planck Institute for Solar System Research
>> > <inlist_diff_off><inlist_diff_0><diff_off.data><diff_0.data>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20171214/aa339b4b/attachment.html>