The Physics Builder Window
The Physics Builder window displays the tree containing the sequence of all physics and building blocks within a file.
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To add new functionality, right-click a node in the tree and choose a functionality from the context menu or click a corresponding button in the Physics Builder toolbars.
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It is only possible to add new physics interfaces to the root of the tree. Each new node represents a new physics interface that can be chosen from the Model Wizard when the interface is complete.
The Physics Builder Branches and Subbranches
External Resources
The External Resources branch is useful to avoid reimplementing features, properties, or components. Import previously created items stored in a different builder file. All items that you implement under the Building Blocks branch in a builder file can be used by any other builder file that imports it.
Building Blocks
Use the Building Blocks branch to create a library of Components, Properties, Features, and Multiphysics Couplings that you can build physics interfaces (including multiphysics interfaces). The Physics Builder Tools chapter describes the features and subfeatures available in detail.
Definitions Library
The Definitions Library contains definitions of material property groups, physical quantities, and other definitions that are used by but are not part of a physics interface. There are these subbranches: Physics Areas, Selections, Extra Dimensions, and Auxiliary Definitions.
Migration
Migration, or backward compatibility, has to be considered in situations when you make changes to your physics interface design but still want users of the interface to use COMSOL model files created in the old Version of the interface.