[mesa-users] Carbon burning

[David Arnett]

Hi Tuguldur,

The email I got said "it had stripped the attachments". I guess the server
only sends them to the addressee, not the whole list (?).
Now I see what it was doing.

The alpha = 2 case is sane (as you know), but alpha = 1 is not. It has
spurious (nonphysical) mixing.
We have actually done the 3D hydro for C, Ne, O and Si shells (all together
in 2D) and C, Ne, and O in 3D,
so we do know which behavior is sane.

>From this I conclude that it is an algorithm problem; I will take this up
with Bill in May when I visit.
While I do not know yet exactly how the problem  arose, I do know that
there are some general constraints that bound the flow behavior.
I suspect the algorithm violates one of these.

Dave


On Wed, Apr 17, 2013 at 11:18 AM, David Arnett <wdarnett at gmail.com> wrote:

> Hi Tuguldur,
> There are two issues here: what is the code doing and what should it do? I
> don't see the graphs, but it sounds like the semiconvection is affected by
> the choice of mixing length. Why should that be, physically? Please email
> the graphs so I can see what MESA is doing.
> Thanks,
> Dave
>
> --
> David Arnett
> Regents Professor
> Steward Observatory
> University of Arizona
>
> Facts are stubborn, but statistics are more pliable.  Mark Twain
> Facts do not cease to exist because they are ignored.  Aldous Huxley
>



-- 
David Arnett
Regents Professor
Steward Observatory
University of Arizona

Facts are stubborn, but statistics are more pliable.  Mark Twain
Facts do not cease to exist because they are ignored.  Aldous Huxley
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