[Getdp] Line elements at boundaries

[Patrick Dular]

Erich- You are right, triangular elements are sufficient to describe the 
field solution at the periphery. Line elements can exist in your mesh 
file, which doesn't mean that they will be used by getdp. A treatment to 
be performed on such elements has to be defined by the user, e.g. by 
defining a constraint of Dirichlet type on a physical region defined by 
line elements, by defining an integral term to be evaluated on such 
elements for a Neumann boundary condition, etc.

Patrick Dular


Erich Muschka Schulz wrote:

> Hi all:
>
> I was wondering about the existence of line elements (elements with 
> two nodes to each element) at the boundary of my model?
>
> When I mesh my model, gmsh creates line elements at the very outer 
> periphery of the model.  I think this is occurring because I have 
> declared a "physical entity"  Boundary, which contains all of the 
> lines on the outer edge of the model. I did this so that I could 
> specify the nodal values at the boundary.
>
>
> I wasn't aware that line elements were required at the edge of models, 
> in particular, as I am constraining the nodal values at the periphery 
> to be zero. As far as I am aware, the triangular elements should be 
> sufficient to describe the field solution at the periphery. I am 
> unclear about the impact of the line elements on the final result for 
> the 2D magnetic vector potential solution. I am only interested in 
> obtaining the values of the vector potential.
>
>
> If the line elements will cause problems, how can I identify all of 
> the nodes at the periphery, without creating all of the line elements 
> in the mesh?
>
>
> Cheers
>
> Erich
>
>
>
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>

-- 
Patrick Dular, Dr. Ir., Research associate, F.N.R.S.
Department of Electrical Engineering and Computer Science
Unit of Applied Electricity
University of Liege - Montefiore Institute - B28 - Parking P32
B-4000 Liege - Belgium - Tel. +32-4 3663710 - Fax +32-4 3662910
E-mail: Patrick.Dular at ulg.ac.be