[mesa-users] WD models with low temperature

[Bill Paxton]

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:
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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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