Domain, Boundary, Point, and Pair Nodes for the Magnetic Fields Interface
The Magnetic Fields Interface has these domain, boundary, point, and pair nodes available, which are listed in alphabetical order.
About the Boundary Conditions
With no surface currents present, the physics interface conditions
need to be fulfilled. Because A is being solved for, the tangential component of the magnetic potential is always continuous, and thus the first condition is automatically fulfilled. The second condition is equivalent to the natural boundary condition and is hence also fulfilled unless surface currents are explicitly introduced.
Table 10-2 lists the interior and exterior boundaries available with this physics interface.
 
Table 10-4: Interior and Exterior Boundary Conditions for the Magnetic Fields Interface
Node
Interior
Exterior
Magnetic Field
x
x
Magnetic Insulation
x
x
Magnetic Potential
x
x
Perfect Magnetic Conductor
x
x
Periodic Condition
 
x
Surface Current
x
x
Available Nodes
These nodes, listed in alphabetical order, are available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or by right-clicking 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.
Also see Table 10-2 for a list of interior and exterior boundary conditions.
•
Ampère’s Law
•
Ampère’s Law, Magnetostrictive
•
External Current Density
•
Initial Values
•
Line Current (Out-of-Plane)
•
Magnetic Field
•
Magnetic Insulation (the default boundary condition)
•
Magnetic Potential
•
Perfect Magnetic Conductor
•
Surface Current
•
Velocity (Lorentz Term)
For 2D axisymmetric components, the COMSOL software takes the axial symmetry boundaries (at r = 0) into account and adds an Axial Symmetry node to the component that is valid on the axial symmetry boundaries only.
Infinite Elements, Perfectly Matched Layers, and Absorbing Layers
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.