Alternative cosmological model

I had a bit of an epiphany the other day when I was musing over
various cosmological ideas, like big-bang, cyclic and steady state
models. It occured to me that there is one model that hasn't had much
of if any mention. The idea came from considering how nature handles
the specific problem of diffusing energy in other environments and
thus led me to believe that there is another possible cosmological
model that may require consideration.

The idea came from considering convection cycles in both solar and
geophysical realms. Here the idea is that energetic regions are
expelled to the outer regions in a column and cooler outer regions
sink in parallel setting up convection cycles.

Cosmologically speaking, we may be living in such a universe and just
happen to inhabitate a region of "hot" space expanding radially
outward, were other regions of "cool space" are contracting radially
inward. This I call the convection cosmological model.

There is nothing that I can think of in the laws of physics that
prohibits this kind of model as I have said, it is a mechanism already
employed in nature.

[Mod. note: this was originally cross-posted between s.a.r. and
s.p.r., but I've restricted it to s.a.r. only -- mjh]