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How to set boundary conditions that involve two boundaries?
Posted 20 mar 2012, 14:48 GMT-4 Low-Frequency Electromagnetics Version 4.3 4 Replies
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-q*(gradient u2) = 1.5*(q*u(anode)-q*u5(cathode)-E(cathode))
-q*(gradient u3) = -0.5*(q*u(anode)-q*u5(cathode)-E(cathode))
where anode and cathode are two boundaries in different positions along the Y axis. (anode is at -1.5 cm along axis Y, cathode is at 1.5 cm along axis Y).
Basically I need to use the conditions of two boundaries in the above equations. How can I realize that?
Thank you
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I would say cut your boundary in two with a point, line or surface, or add a sign(y)* condition to change for y<0, repectively >0
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Good luck
Ivar
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Cutting the boundary is impossible since they are two different boundaries, one is located at -1.5 cm along axis Y, and the other at 1.5 cm along Y. Thanks, Ivar!
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my turn to be sorry, as I must have missed your question ;)
It would be easier to understand if you upload a simple model, I'm woundering if the issue is not about the variable / field default notation of COMSOL, that played me many games and a lot of confusion before I got it right
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Good luck
Ivar
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Iam having problem in setting the boundary condition for the 3d generator.
please help me with this
thank you