The Single-Turn Coil Feature
The Single Conductor Coil feature models a single, solid region of a conducting material (for example, metal) in which the current flows. The lumped voltage and current of the coil correspond, respectively, to the integral of the electric field along the coil length and to the integral of the current density on a cross section. Use the Single-Turn Coil domain node to model a single wire with a nonnegligible cross section; the Single-Turn Coil boundary node can be used for a thin conductive layer whose thickness is negligible (for example, in frequency domain, it is small with respect to the skin depth).
In COMSOL Multiphysics version 5.2 and earlier, the Single-Turn Coil was available in The Magnetic Fields Interface and The Rotating Machinery, Magnetic Interface. The functionality provided by this feature has been incorporated in the Coil feature in the form of the Single conductor option.
To preserve backward compatibility, the Single-Turn Coil features present in models created in version 5.2 and earlier will still be available when opening the models in the current version, but it is recommended to replace them with the new Coil feature.
Selecting unconnected geometrical entities with a Single-Turn Coil connects them in parallel.
For examples of a Single-Turn Coil, see:
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Inductive Heating of a Copper Cylinder: Application Library path ACDC_Module/Electromagnetic_Heating/inductive_heating
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Modeling of a 3D Inductor (described in detail in the Introduction to the AC/DC Module manual): Application Library path ACDC_Module/Devices,_Inductive/inductor_3d.