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From: | Renard Yves |
Subject: | Re: [Getfem-users] Boundary problems |
Date: | Wed, 15 Jul 2009 21:37:45 +0200 |
User-agent: | Dynamic Internet Messaging Program (DIMP) H3 (1.1) |
Mattia Assanelli <address@hidden> a écrit :
Good morning everybody I succeded in solving my "generic elliptic" problem, but I still have some troubles analyzing data: - I noticed that on the boundary the value imposed by a Dirichlet condition ins't respected by the solution...
Well ! If you use a multiplier having a lower degree than the main unknow you can have a little difference since the Dirichlet condition is prescribed in a weak sense. But if the multiplier is string enough the Dirichlet condition will be exact.
- I also tryed to calculate the flux through the contact...is there a simple alternative to manually integrate the gradient on the boundary surface?
To integrate the gradient on the boundary is not a good idea. Theoretically, you are not garanted that this value converges toward what you want. It is strongly better to integrate the multiplier ensuring the contact condition.
Yves. ----- Fin du message transféré -----
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