[mesa-users] WD models with low temperature

Bill Paxton paxton at kitp.ucsb.edu
Thu Apr 14 13:17:05 EDT 2016


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

Hi,

wd_cool might be doing more than you need.  in the 2nd inlist, it switches atm option as follows:

1st inlist: 
      which_atm_option = 'grey_and_kap'
2nd list:
      which_atm_option = 'WD_tau_25_tables'

You might try leaving the grey_and_kap option in effect during the cooling in the 2nd inlist.  That might help since 'grey_and_kap' is a simpler boundary condition than the tau tables, and you report problems at the surface.

I have done that with the wd_cool test case, and it has no problems at all in cooling the center to 1e7 -- takes under 300 steps with no retries required.   Of course that isn't the ONe case you are interested, but it is a good sign that this might work for you too.  Please give it a try and let us know how it goes.   I'm running this on the current development version that is not yet released, so it is possible that your will run into problems with an older version of mesa.  

Cheers,
Bill














> 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>------------------------------------------------------------------------------
> Find and fix application performance issues faster with Applications Manager
> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z_______________________________________________
> mesa-users mailing list
> mesa-users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/mesa-users





More information about the Mesa-users mailing list