About Auxiliary Equation-Based Nodes
The PDE Interfaces provide an environment for specifying a model in terms of equations. In many cases, however, you may only be interested in adding an equation term or a constraint to the PDE implemented by a physics interface.
The auxiliary equation-based nodes are found under the context submenus More, Edges, and Points. To display these in the context menu, click the Show More Options button () on the Model Builder toolbar and select Equation-Based Contributions in the Show More Options dialog.
The following nodes (listed in alphabetical order) can be added to most physics and PDE interfaces:
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Auxiliary Dependent Variable
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Discretization (Node)
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Pointwise Constraint
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Weak Constraint
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Weak Contribution (PDEs and Physics)
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Weak Contribution on Mesh Boundaries
The following nodes can be added in the same way to most physics interfaces, but can also be added directly under Global Definitions or Component>Definitions, making it possible to set up a PDE without any physics or PDE interface:
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Constraint
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Dependent Variable Field
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Global Dependent Variables
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State Variables
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The PDE Interfaces
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Equation Contributions
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Working with Geometric Entities
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Domain, Boundary, Pair, Edge, and Point Conditions for PDEs