Hello Thomas.
Le Sunday 18 May 2008, Thomas Ward a écrit :
Thanks Stephane, that fixed it.
I thought my formulation was equivalent to the one you wrote,
As I understand it, my formulation includes the natural boundary
conditions which is unnecessary but I thought that there was no harm
(other than inefficiency) to include them, anyway thanks for the
pointers to the wikipedia stuff, I will look through them and try to see
why including the natural boundary codtions in the surface integral
won't work.
It is not equivalent. I join you a formal way of getting this variationnal
formula. Check finite element books to get details and a clean establishment
of the formula.
I'm about to try using periodic BC, I note from the mailing list that
you were playing around with this a couple of years ago, do you have any
sample files or other documentation or pointers to the source code?
Yes this is not a big deal in ff3d. Assume that M is your structured mesh,
then
M = periodic(M,0:1,2:3,4:5);
will create a triperiodic mesh where
0 represents xmin,
1 represents xmax,
2 represents ymin,
3 represents ymax,
4 represents zmin,
5 represents zmax,
M = periodic(M,2:3);
would create a periodic mesh in the direction y. Note that up to now M must be
a structured mesh.
Do you have any infinite elements? I'm thinking of a radiation condition
decaying to zero at infinity on an open boundary.
No. No such element is implemented ...
Best regards,
Stéphane.
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