[mesa-users] Enabling diffusion in Mesa-r8118

Jared Brooks jcbrooks at physics.ucsb.edu
Fri May 20 15:06:33 EDT 2016

Hi Émile,

All your timesteps are less than a year, and if you look in
controls.defaults, right under do_element_diffusion is a control named
diffusion_dt_limit, which is default set to 3.15d7 (1 year in seconds). Try
lowering this and see if diffusion starts working.


On Fri, May 20, 2016 at 10:50 AM, Émile Jetzer <emile.jetzer at mail.mcgill.ca>

> I have been trying to do simulation of a neutron star based on `ns_h` from
> the standard test suite, with diffusion. However, I've found that setting
> `do_element_diffusion` to `.true.` in `controls` did not change the result
> I got. To make sure, I ran tests with no accretion, & the pgstar output was
> the same in the case with & the case without diffusion. Is there something
> I am missing? The full code is available at
> http://github.com/ejetzer/neutronstars2 .
> I have done something similar successfully in a previous version of Mesa,
> but cannot catch what I might be missing this time. The old code is at
> http://github.com/ejetzer/neutronstars .
> Thanks,
> Émile Jetzer.
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