[mesa-users] WD models with low temperature

[chenhl]

Dear Bill,

Thanks a lot for reply!

Actually I have noticed that difference. I have tried to run the
calculation with which_atm_option = 'grey_and_kap' in the second inlist
file.
Indeed the code can keep going. But after one hour, the central temperature
only change slightly.  Then I simply stop the calculation.

In the former email, you said you have a check. I guess you use some CO WD
models.
Did you try to use some ONe WD models or the model I attached in the first
email?

Best wishes,
Hailiang

On Thu, Apr 14, 2016 at 7:40 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi,
>
> Just as a check, I let wd_cool keep going as long as it could.  All was
> fine until the center temperature dropped below 1e6.  At that point we
> really do fall off the edge of the world in the current eos, and it gives
> up.  So it runs great for about 800 steps, then abruptly dies.  Here's the
> last good model:
>
>
> bill
>
>
>
>
>
>
>
> On Apr 14, 2016, at 6:14 AM, chenhl wrote:
>
> > Dear all,
> >
> > I want to make some ONe WD models with central temperature Tc ~ 1.0e7 K.
> > But I always fail to cool the WD down.
> >
> > I try to do this with two steps.
> > First, I use make_o_ne_wd test case to make a WD model with a mass I
> need.
> > Then I use wd_cool test case to reduce the central temperature.  I
> always fail at the second
> > step with following error.
> >
> >
> ----------------------------------------------------------------------------
> >                                                     dt
> 8.7052562366518861D-14
> >                                      min_timestep_limit
> 1.0000000000000000D-13
> >
> >  stopping because of convergence problems dt < min_timestep_limit
> >
> >
> >
> >
> >  terminated evolution: convergence problems
> >
> >
> >                   runtime, retries, backups, steps         15.275467
>       2.000000       188        69      2693
> >        2693   8.551489  1.065E+05 -12.382713   5.451730   1.253481
>  0.000000   0.000000   0.000000   0.919403   0.000000  28.486602   3126
> 188
> >  -19.325921   7.496896  -0.246400   3.879481   5.942448 -99.000000
>  1.253481   0.000000   0.373003   0.080597   0.014044   6.309162     25
>  69
> >  2.3535E+07  24.633374   4.565573   5.439943   7.114711  -6.300953
>  1.253481   0.030127   0.508866   0.000000  9.860E-01 -0.833E+02
>  convergence
> >
> > Fri Apr 15 18:24:37 CST 2016
> >
> > ******************************************************************
> > failed to create cool.mod when running inlist_wd_cool2
> > ******************************************************************
> >
> > The version of MESA I used is 4906. The inlist files I used are attached.
> >
> > Is there anyone have experience on this?  Thanks!
> >
> > Best wishes,
> > Hailiang
> >
> >
> >
> >
> >
> >
> <inlist_wd_cool1><wd1.mod><inlist_make_o_ne_wd><inlist_wd_cool2>------------------------------------------------------------------------------
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