[mesa-users] Convective core disappears when use_Ledoux=.true.

[Ehsan Moravveji]

Hello Rich,
I think this is an already-known issue. Just a little bit of overshooting washes the mu-gradient zone and numerical instabilities,  and makes the evolution more smooth. This, however, replicates the Schwarzshild. Another alternative is to use semi-convection with alpha_sc between 10^-5 to less than 10^-2, though you need to play around with the limits as well.

Best regards,
Ehsan 



On Jun 13, 2014, at 11:14 PM, Richard Townsend wrote:

> Hi folks —
> 
> I’m playing around with evolving a 5 Msun model across the ZAMS. To my surprise, I find that core convection disappears (leading to a positive Brunt N2) when I set the use_Ledoux flag to .true. Can someone explain what’s going on here, please!
> 
> Also, things look more or less OK when I set use_Ledoux = .false. — but the Brunt is a bit noisy in the mu-gradient zone. What’s considered the best approach to smoothing this noise?
> 
> cheers,
> 
> Rich
> 
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