Output (for Geometry Analysis)
The Output subnode is available from the context menu (right-click the Geometry Analysis parent node) or from the Physics toolbar, Attributes menu. Use it to specify the boundaries where the wires exit the domain in an open coil. No Output subnode is required in a closed-loop coil. The wire direction is forced to be orthogonal to the boundary. Used in combination with the Input (for Geometry Analysis) node, it also defines the direction of the current flow (from Input to Output).
For an open coil, the Input subnode should never be added to boundaries that are interior to the coil’s domain selection. Note also that an open coil should have its start (Input) and end (Output) on boundaries that are exterior to the domain selection of the parent physics (e.g. Magnetic Fields) and of a type that supports closure of the coil by means of an induced surface current density. The latter condition means Magnetic Insulation and/or, in the frequency domain, Impedance Boundary Condition.
Constraint Settings
To display this section, click the Show button () and select Advanced Physics Options.
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Using Coils in 3D Models
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Automatic Coil Geometry Analysis
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The Magnetic Fields Interface
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Theory for the Magnetic Fields Interface
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Studies and Solvers in the COMSOL Multiphysics Reference Manual