Backward Compatibility with Version 5.0 and older

Coil current calculation

When models saved in previous versions are opened in version 5.1, the Coil Current Calculation study steps are migrated to Coil Geometry Analysis. Old solutions stored in the model can still be postprocessed, and the solver sequence will be regenerated automatically (with a Stationary solver) the first time the study is solved.

The Coil Geometry Analysis study step (formerly Coil Current Calculation) will now solve for all of the coils in the active interfaces. To solve only for specific coils (specified using the CoilName property), set the SpecifyCoil property to 1.

The default solver sequence generated by the Coil Geometry Analysis is different in version 5.1. Code that accesses specific solver features in the generated solver sequence may need to be reviewed.

Other coil improvements

Harmonic Perturbation subnodes under coil features (Single-Turn Coil, Multi-Turn Coil) are now global features, so the call to the create method should use the appropriate space dimension (-1):

model.physics("mf").feature("stcd1").create("hp1",    "CoilHarmonicPerturbation", -1);

 

Global features have no selections, so code that accesses the selection of the Harmonic Perturbation features may need to be reviewed.

Some of the improvements in the 3D Multi-Turn Coil features may require a review of existing code that uses the COMSOL API.

Subnodes required to set up the coil features are now added automatically. Existing code that uses the coil features may need to be updated.

The parameters eCoil and length have been moved from the Multi-Turn Coil features (boundary and domain) to the new subfeature UserDefinedCoilGeometry.

Other improvements

New functionality introduced in version 5.1 is disabled by default when opening models created in previous versions:

•	New boundary conditions for Gauge Fixing features

•	Accurate coil voltage calculation

This functionality can be enabled using the appropriate inputs in the Settings window. Refer to the documentation for the individual features for more details.