On 6/10/21 8:31 AM, Michael Lee wrote:
1) thin plate under pressure with *four edges simply supported*.
2) thin plate under pressure with *four corner points simply supported*.
2021-06-10_082227.png
For the first one, I tried the following code, but it seems boundary condition
only works with face not on edge.
That is correct. Mathematically, you can only prescribe boundary conditions on
portions of the boundary (i.e., on *faces*) but not on edges in 3d or vertices
in 2d/3d. What is easy to do in deal.II matches what is mathematically possible.
Now, you will ask why other software packages allow you to do what is not easy
in deal.II. The answer is that other packages generally use a fixed mesh, and
on a fixed mesh, prescribing boundary conditions on a vertex is roughly
equivalent to prescribing boundary conditions on the adjacent faces. That's ok
if you keep the mesh fixed, but it means that you are changing the kind of
boundary conditions every time you change the mesh if you use software that
uses adaptive mesh refinement.
So my suggestion would be to think about the physical situation you want to
model, and translate that into prescribing boundary conditions on faces
instead of edges/vertices.
Best
W.
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Wolfgang Bangerth email: [email protected]
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