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

[Bill Paxton]

On Jun 13, 2014, at 2:14 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.

Just like what happens for the 3 Msun case in Fig 15 of the 2nd mesa paper, assuming you are running with no semiconvection.


> Can someone explain what’s going on here, please!

I look forward to hearing the explanation myself!


> 
> 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?



smoothing is the best approach to smoothing.  try increasing the value for

      num_cells_for_smooth_brunt_B = 2
         ! number of cells on either side to use in weighted smoothing of brunt_B


-b