Boundary condition of metal surface

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Author Message   Sungbo Cho (atjuly) Member Username: atjuly Post Number: 4 Registered: 07-2004 Posted on Wednesday, February 01, 2006 - 08:58 pm:    Electrical part. Imagine that several metal surfaces (thickness zero) locate on the bottom of media in a 3D model. When two of those metal surfaces are used for the current flux, the boundary condition of the electrodes may be defined by VALUE() or NATURAL(). Except the electrodes, what is the boundary condition of other metal surfaces (thickness zero) with low conductivity?   Sungbo Cho (atjuly) Member Username: atjuly Post Number: 5 Registered: 07-2004 Posted on Thursday, February 02, 2006 - 04:38 am:    Sorry a mistake in the last sentence! Not with low conductivity, but with high conductivity.   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 533 Registered: 06-2003 Posted on Thursday, February 02, 2006 - 06:10 pm:    Apply the boundary condition that describes the effect the metal surface has on the field. The specific statements that you use will depend on what variables you are modeling and what equations describe them. See Natural BC in the Help Index for documentation regarding the meaning of the NATURAL() statement.   Sungbo Cho (atjuly) Member Username: atjuly Post Number: 6 Registered: 07-2004 Posted on Friday, February 03, 2006 - 07:24 am:    Roughly, I did write as following. VARIABLES V EQUATIONS div(K*grad(V))=0 EXTRUSION Surface 'bottom' Z=0 Layer 'Media' Surface 'top' Z=top BOUNDARIES region '1 electrode' surface 'bottom' Natural(V)=In ... region '2 electrode' surface 'bottom' Natural(V)=-In ... region 'other electrodes' surface 'bottom' ?????(what boundry condition) ... What is the boundary condition of other electrodes??