Dear All I am trying to get the normal derivative value at a specified boundary. for this I have written code as: real Nu = int1d(Th, hot)( dx(T)*N.x + dy(T)*N.y); for( int n1 = 0; n1<=20 ; n1++) { court<< Nu(20/n1, 0) << endl; } Am I right for Nu values at a boundary hot.

varf vNeuman(used,v) = int1d(Th)(v*(dx(Uex)*N.x+dy(Uex)*N.y)/lenEdge); Vh vn; // Finite element function to store the Normal derivative vn[]= vNeuman(0,Vh); plot(vn,wait=1);

Why do you integrate the normal derivative over the boundary?

Normal Derivative values at boundary

General Discussion

cmd (Chris) September 21, 2023, 12:10pm 5

See my solution in this post.

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Normal Derivative values at boundary

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