[mesa-users] wd diffusion

[Bill Paxton]

it would also be good to clarify your goals -- are you studying diffusion, or is diffusion just a way to create models for the topic you are actually interested in?  if the latter, then there may be other ways to create models for you with a pure H outer shell that use "stellar engineering" instead of diffusion.

b


On Jan 9, 2017, at 10:19 AM, Robert Farmer wrote:

> Hi
> Have you tried the wd_diffusion and/or the wd_surf_at_tau_1m4  test_suite cases?
> 
> If you have and are still having problems, can you post your inlists with the changes you've made.
> 
> Regards
> Rob
> 
> On Sun, Jan 8, 2017 at 4:55 PM, Jing Luan <jingluan.xw at gmail.com> wrote:
> Hello,
> 
> I'd like to make a WD model with pure hydrogen atmosphere, i.e. all heavier elements have settled down. Thus I turn on diffusion in mesa. However, mesa has a hard time converging when I also require the surface optical depth to be 5 or even lower (actually I need the low optical depth part to be treated well in the model). Does anyone know that why diffusion does not work well in low optical depth part please? Or how do I get a WD model with hydrogen, helium and metals well separated in depth while its surface goes up to tau=0.01 please?
> 
> Many thanks!
> 
> Sincerely,
> Jing 
> 
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