Domain, Boundary, Point, and Pair Nodes for the Magnetic Field Formulation Interface
The Magnetic Field Formulation Interface has these domain, boundary, point, and pair nodes available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or 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
With no surface currents present the physics interface conditions
need to be fulfilled. Because H is being solved for, the tangential component of the magnetic field is always continuous, and thus the condition is automatically fulfilled.
Table 5-5 lists the interior and exterior boundary conditions available with this physics interface.
Table 5-5: Interior and Exterior Boundary Conditions for the Magnetic Field formulation Interface
Node
Interior
Exterior
Electric Field
x
x
Impedance Boundary Condition
 
x
Magnetic Field
x
x
Magnetic Insulation
x
x
Perfect Magnetic Conductor
x
x
Surface Magnetic Current Density
x
x
Available Nodes
These nodes are available for this physics interface and listed in alphabetical order. Also see Table 5-5 for the list of interior and exterior boundary conditions.
•
Electric Field
•
Faraday’s Law
•
Initial Values
•
Magnetic Gauss’ Law
•
Magnetic Insulation
•
Magnetic Field
•
Surface Magnetic Current Density
These nodes are described for the Magnetic Fields or Electrostatics interface (listed in alphabetical order):
•
External Current Density
•
Force Calculation
•
Impedance Boundary Condition
•
Perfect Magnetic Conductor
•
Velocity (Lorentz Term)
For 2D axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0) into account and automatically adds an Axial Symmetry node to the component that is valid on the axial symmetry boundaries only.
In the COMSOL Multiphysics Reference Manual see Table 2-4 for links to common sections and Table 2-5 to common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.