Re: Making a 3D system translationally invariant?

Hi Jeff,

thanks for your interest.
No, the reason for my request is not what you have guessed.
I will explain it in more detail:

As you know, the 2D structural mechanics models intended
for the simulation of traslationally invariant systems assume the
"plane strain approximation", i. e., assume
the displacements to follow the pattern: u(x,y), and v(x,y) and w=0.
And, accordingly, its implementation in COMSOL does not use the
dependent variable w.
However, this restriction does not exhaust the compatible 2D elasticity
problems. I have worked out the general case and I want to implement it
in COMSOL, but that general case allows for a z-displacement w(x,y) (so-called
warping function), and therefore I need to dispose in COMSOL of the dependent
variable w. Since it is not accessible in 2D models, I have moved to a 3D model,
where one has dependent variables (u,v,w), and tried to force the (x,y) dependence
by the means described in my previous post, but so far I still obtain a remanent
z-dependence in the results.

So my question remains alive:

Is there any procedure to force the dependent variables (in this case the
displacements) in a 3D model to be EXACTLY independent of the z-coordinate?

I would really appreciate any comment or help.

Regards,
Alberto.