[mesa-users] astero module: NaNs in profile, possibly uninitialized velocity variable?

Robert Farmer rjfarmer at asu.edu
Fri Feb 10 12:56:48 EST 2017


Hi Warrick

Thanks for the bug report, i've just run the current development version of
mesa and its been fixed (v_dir_r comes out as 0 and total_energy as some
non-zero value) between 8845 and 9549.

I'll see if i can find what you need to do to get 8845 working.

Rob

On Fri, Feb 10, 2017 at 9:12 AM, Warrick Ball <wball at bison.ph.bham.ac.uk>
wrote:

> Hi,
>
> I think I've stumbled upon an innocent bug while working with the MESA
> module.  This is quite easy to reproduce: in r8845, copy a new
> star/astero/work folder and set
>
>    write_profile_for_best_model = .true. ! instead of .false.
>    best_model_profile_filename = 'best.profile' ! or whatever
>
> then make and run.  When the star gets sufficiently close to the observed
> data to start writing profiles, I get a star's worth of lines of the form
>
>                        total_energy           1                       NaN
>                             v_div_r           1                       NaN
>
> I think I correctly traced the error message down to the function do_col
> in star/private/profile.f90, which has a block checking for NaNs after a
> call to some getval_for_profile in star/private/profile_getval.f90.
> Rummaging through there, it looks like the problem is probably the
> variable v, since total_energy and v_div_r have that in common.
>
> I haven't dug any further through the logic but my suspicion is that this
> is a case of v(k) having not been set.  Since I'm not following the
> velocity variable, it doesn't actually matter to me.  (The run is
> otherwise behaving perfectly normally.)  But the NaNs were worrying,
> though I'm sure they would also be suppressed by removing total_energy and
> v_div_r from profile_columns.list.
>
> I'll try to dig a bit further to see if I can find where v is initialized.
>
> Cheers,
> Warrick
>
>
>
> ------------
> Warrick Ball
> Postdoc, School of Physics and Astronomy
> University of Birmingham, Edgbaston, Birmingham B15 2TT
> wball at bison.ph.bham.ac.uk
> +44 (0)121 414 4552
>
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