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odd bug in lagrangian multipliers in COMSOL

Posted Mar 2, 2010, 9:55 p.m. EST 1 Reply

Mac Book
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If you use lagrange multiplier, it seems that the value of the lagrange multiplier depends on the sign of "c" of the subdomain equation. For example if you solve for "-del^2(phi)=0" and "del^2(phi)=0", and the same boundary conditions, you will get different values(of opposite sign) for lm1 on the boundaries.

Can somebody explain why? I thought the value of "lm1" would depend on the direction of the normal
1 Reply Last Post Mar 3, 2010, 1:38 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 3, 2010, 1:38 a.m. EST
Hi

Good question, have you tried the official COMSOL "support" for that one ?

Pls do no forget to report bac once you get an explanation

Ivar
Hi Good question, have you tried the official COMSOL "support" for that one ? Pls do no forget to report bac once you get an explanation Ivar

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