[mesa-users] Removing singletons (single zone convection)

[Stan Woosley]

I don't think the inconstancies are all related to convection though many are.
There are convergence settings on qse, nse, eos, and the temperature and density
within a given step. Anywhere there is an "if test" is a candidate. 

That said, a lot of the diversity comes from the mixing of He into the He
convective core at the end of helium core burning due to the expansion of the
He core (in Lagrangian mass). 

   Stan


On Apr 22, 2013, at 4:27 PM, David Arnett <wdarnett at gmail.com> wrote:

> I have a more precise argument, but here is the short, quick and dirty one: 
> 
> In order to turn the convective motion around (and have a limited velocity field) an acceleration of magnitude ~u**2/\delta r must be applied outside the "schwarzschild convective" region. In a convective region, the kinetic energy comes from buoyant driving over a path length, which is proportional to \delta r for single zone convection. The flux is the dominant variable, and when roughly constant, implies u**3 is roughly constant, so since in the steady state of driving equal damping, we have u ~ \delta r, and F ~ \delta r **3. Small zones should have little effect. QED ;-)
> 
> So removing singletons is very likely to be OK.
> 
> -- 
> 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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