[mesa-users] diffusion causing model to get stuck

[Jean McKeever]

Hello,

I was trying to create a grid of models using the astero module and the
grid got stuck on a particular point. After some testing of turning things
on and off I have discovered that do_element_diffusion appears to be the
culprit. For a 1.4 solar mass star with a metallicity of -.4, the model
seems to get caught in a series of retries where dt keeps decreasing to be
prohibitively small. This happens very early on in the model. If I turn off
diffusion, the model proceeds normally.

Can anyone provide insight as to why diffusion is causing the model to get
stuck? I have attached some modified inlists and starting model to help
reproduce this. I checked the newest version of mesa and it is still a
problem in 9793.

Thank you,
Jean
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