Domain, Boundary, Edge, Point, and Pair Nodes for the Electric Currents Interface
The Electric Currents interface has these domain, boundary, edge, point, and pair nodes available from the Physics ribbon toolbar (Windows users) or Physics context menu (Mac or Linux users). You can also right-click to access the context menu (all users).
In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
About the Boundary Conditions
The exterior and interior boundary conditions listed in Table 4-1 are available. The relevant physics interface condition at interfaces between different media and interior boundaries is continuity; that is,
which is the natural boundary condition.
Available Nodes
These nodes are available for this physics interface, listed in alphabetical order. Also see Table 4-1 for a list of interior and exterior boundary conditions, including edge, point, and pair availability.
•
Boundary Current Source
•
Contact Impedance
•
Current Conservation
•
Current Source
•
Distributed Impedance
•
Electric Insulation
•
Electric Point Dipole
•
Electric Point Dipole (on Axis)
•
Electric Shielding
•
Electrical Contact
•
External Current Density
•
Floating Potential
•
Initial Values
•
Line Current Source
•
Line Current Source (on Axis)
•
Normal Current Density
•
Piezoresistive Material1
•
Point Current Source
•
Sector Symmetry
•
Terminal
1This feature is available with the Piezoresistivity, Domain Currents interface, which requires the MEMS Module.
These nodes are described for the Electrostatics interface:
•
Archie’s Law
•
Change Cross Section
•
Change Thickness (Out-of-Plane)
•
Effective Medium
•
Electric Potential
•
Force Calculation
•
Ground
•
Periodic Condition
 
In the COMSOL Multiphysics Reference Manual, see Table 2-3 for links to common sections and Table 2-4 for common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.
For axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0) into account and automatically adds an Axial Symmetry node to the model that is valid on the axial symmetry boundaries only.
Table 4-1 lists the interior and exterior boundary conditions available with this physics interface. It also includes edge, point, and pair availability.
Table 4-2: Interior and Exterior Boundary Conditions (including Edge, Point, and Pair Availability) for the Electric Currents Interface
Node
Interior
Exterior
Also Available for
Boundary Current Source
x
 
pairs
Contact Impedance
x
 
pairs
Distributed Impedance
x
x
not applicable
Electric Insulation
x
x
pairs
Electric Potential
x
x
edges, points, and pairs
Electric Shielding
x
x
pairs
Floating Potential
x
x
pairs
Ground
x
x
edges, points, and pairs
Normal Current Density
 
x
not applicable
Periodic Condition
 
x
not applicable
Terminal
x
x
pairs, domains