Let us take Benard cells for example. It is a good idea. I guess that in
this case the incompressible Navier-Stokes equations with the Boussinesq
approximation for free convection should suffer.
If I understand correctly, bifurcation in this case arises when we
increase the temperature difference between two plates. That is, if we
consider the stationary Navier-Stokes equations on the top of thermal
gradient Del T in the system, there is a critical Del T after that we
have several solutions.
To be back to my question. One could construct a system of equations
from the stationary Navier-Stokes equations + Del T(time). In this case
we have a problem that at some time when we reach a critical Del T, the
system of equation has suddenly several solution and the question would
be which one will be chosen.
On the other hand, one could use the transient Navier-Stokes equations
directly and it seems that in this case the problem of bifurcation will
not arise as such. Well, in this case there are numerical problems.
My question would be if physical laws allow for the first situation when
at some point during transient solution a mathematical model has several
solutions. If yes, then I do not understand how physics chose the one of
possible solutions.
Evgenii
On 25.03.2012 05:50 Russell Standish said the following:
Look up the literature on catastrophe theory. There were many examples
of just these phenomena cooked up (particularly by Zimmerman IIRC)
some good, many not so good. I'm sure you should be able to find
something appropriate - maybe the appearance of Benard cells for
instance.
Cheers
On Sat, Mar 24, 2012 at 10:05:00PM +0100, Evgenii Rudnyi wrote:
Hi Stephen,
I am not sure if I completely understand you. My question was rather
what happens in Nature if we assume that its mathematical model
includes bifurcations and/or symmetry breaking.
Do you know a simple mathematical model with bifurcations and/or
symmetry breaking? It might be good to consider this on a simple
example.
Say, I do not understand how do you apply statistics in this case.
Either it is unclear to me how infinite computational power will
help.
Evgenii
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