Forced equality between two fields

General Discussion
1

Hello every one,

I have a problem with 6 unknown fields (ux1,uy1,ux2,uy2,p1,p2) and 6 test functions (vx1,vy1,vx2,vy2,q1,q2). My geometry is a square (0,1)(0,1) divided in two equal rectangle by a vertical internal line at (x=0.5). I need to force the equality between the two fields ux1 and ux2 at the internal line. I tried to add the integral
int1d(Th, internal_line)(q2*(ux1-ux2))
but it doesn’t work. Is there a trick to do it?

Thank you.

2

They are lot of way to solve this problem,
Read Domain Decomposition technique,
And a Lagrange multiplier on border x=0.5.for exemple,
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