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 box.
These are the available nodes (listed in alphabetical order):
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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
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The PDE Interfaces
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Working with Geometric Entities
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Domain, Boundary, Pair, Edge, and Point Conditions for PDEs