[petsc-users] How to impose boundary conditions using DMDA

[Fengwen Wang]

Dear Colleagues,


I use the finite element method to solve my problem in Petsc.


Mesh is defined as a  regular mesh using DMDA.  I have a special boundary condition which I  do not know how to impose it in Petsc.


In a 2D problem, the domain is unit size, two degrees of freedom per node (u, v). I would like impose the following boundary condition:


u(x=1) = -v ( y=1) and v(x=1 )= -u (y=1) .


How can I impose such a boundary condition in Petsc?


Thanks a lot.


Best regards

Fengwen



____________________________________________________
Senior Researcher
Department of Mechanical Engineering, DTU
Nils Koppels Allé
Building 404
2800  Kgs. Lyngby
fwan at mek.dtu.dk
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