Domain, Boundary, Edge, Point, and Pair Nodes for the Darcy’s Law Interface
The Darcy’s Law Interface has the following domain, boundary, edge, point, and pair nodes, these nodes are available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or right-click to access the context menu (all users).
Domain
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Porous Medium
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Unsaturated Porous Medium
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Dual Porosity Medium
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Dual Permeability Medium
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Unsaturated Dual Permeability Medium
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Mass Source
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Cross Section
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Initial Values
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Unsaturated Porous Medium
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ThicknessContributing Velocity
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Porous Electrode Coupling
Boundary, Edge, and Point
The following nodes (listed in alphabetical order) are available on exterior boundaries:
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Atmosphere/Gauge
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Electrode Surface Coupling
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Flux Discontinuity
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Fracture
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Hydraulic Head
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Inlet
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Interior Wall
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Line Mass Source
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Mass Flux
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No Flow
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Outlet
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Pervious Layer
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Point Mass Source
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Precipitation
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Pressure
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Pressure Head
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Reaction Coefficients1
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Symmetry
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Thin Barrier
1 This node is described for the Transport of Diluted Species Interface
The relevant physics interface condition at interior boundaries is continuity:
The continuity boundary condition ensures that the pressure and mass flux are continuous. In addition, the Pressure boundary condition is available on interior boundaries.
The continuity boundary condition provides continuity for the pressure and mass flux. In addition, the following boundary conditions are available on interior boundaries:
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Pressure
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Pressure Head
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Hydraulic Head
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Interior Wall
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Pervious Layer
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Flux Discontinuity
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Fracture
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Thin Barrier
Note that some of the above-mentioned domain or boundary conditions are only available with some products. For a detailed overview of the functionality available in each product, visit https://www.comsol.com/products/specifications/
In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
For axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0) into account and automatically adds an Axial Symmetry node that is valid on the axial symmetry boundaries only.
In the COMSOL Multiphysics Reference Manual see Table 2-4 for links to common sections and Table 2-5 to common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.