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Reasons of failure
The simulation didn't give us the hoped results. Not any instabilities
developed. The reason of this failure are :

We are not in the conditions of development of the instability.

A shearing layer exists, so the theoretical study of stability is not more
valid

The absolute instability of KelvinHelmhotz is became a convective instability.
The boundary conditions are too proper to allow the development of an instability.
A convective instability just amplifies and convies the perturbation. So,
as the boundary conditions are very proper, the observation of instabilities
is very hard.
There are two possibilies :

The use of a very long domain to let the computationnal errors initialize
the instability

The introduction of a little perturbation directly in the boundary condition
We haven't had the time to test this two possibilities, but the introduction
of a perturbation is a good representation of what happends in a real situation.
So the study of this case would be a interesting thorough examination.
Next:Study
of the amplificationUp:The
case with advectionPrevious:Natural
configurationContents
Stephanie Terrade
Julien Delbove
20001106