[mesa-users] On the MLT++
mathren90 at gmail.com
Tue Oct 28 19:08:59 EDT 2014
I would like some more detailed information regarding the MLT++, that I
could not find neither in the second MESA paper, nor in the documentation.
First of all: Why call it MLT*++*? As far as I understand, it is just a
trick to help convergence and avoid pressure inversions which in
principle could be physical (or something like mass loss, or photon
bubbles could prevent them).
Second, and more important: What happens to the energy flux when MLT++
MLT++ artificially decreases the superadiabaticity to enforce a
near-adiabatic stratification of the structure, so what happens in
convective regions where the superadiabaticity is reduced? Will MESA
shut down convection there (it seems to me it doesn't)? And what about
the convective energy flux, which is proportional to the
superadiabaticity to the 3/2-power? Is it changed by the MLT++, and if
yes, does the reduced flux imply that a larger amount of energy is
trapped inside the star?
From this email exchange
http://sourceforge.net/p/mesa/mailman/message/32229940/ it seems that
the energy is nevertheless carried out by the unknown mechanism
represented by the MLT++, but I am still confused.
Thanks in advance,
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