) collects user-defined parameters, variables, and functions accessible at all levels in the Model Builder, the Definitions branch (
) under each Component collects the definitions of variables, functions, and other objects where the geometric scope is restricted to a single component.
), which saves selections of geometric entities (boundaries, for example) that relate to a region or part of the overall geometry for reuse in operations later in the modeling process.
) and choose an option from the context menu:|
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Variables (
 ): Add user-defined variables to simplify the expressions of other variables and properties. |
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Variable Utilities (
 ). Add nodes that manipulate vectors and matrices, define parameterized expressions, or set up various special variables, for example participation factors and Mass Properties, for use in modeling or postprocessing. |
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View: Create a user-defined view to visualize the model. See User-Defined Views in the Visualization and Selection Tools chapter.
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Functions (
 ): Add user-defined functions based on analytic expressions or imported data, or specifying parameters for common function types such as step functions, ramps, and random functions. |
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Probes (
 ): Add a probe to monitor the development of a scalar-valued quantity (real or complex-valued number) during a dynamic simulation. |
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Nonlocal Couplings and Coupling Operators (
 ): Add nonlocal couplings inside or between Components, in the form of integration, mapping, projection and similar user-defined operators. |
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Selections (
 ): Create a user-defined set of geometric entities for reuse throughout the model component. See Creating Named Selections in the Visualization and Selection Tools chapter. |
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Pairs: Pairs are only available and necessary when the model geometry is an assembly. See Identity and Contact Pairs. There are two types of pairs:
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Contact Pair (
 ), which specifies two sets of boundaries that can come in contact under deformation. The contact pairs are only available if your license includes the Structural Mechanics Module or the MEMS Module. |
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Coordinate Systems (
 ): Create coordinate systems for use in the physics interfaces. |
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Extra Dimensions: Attach extra dimensions to a selection in the base geometry of a model. See Using Extra Dimensions for more information.
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Moving Mesh Features (
 ). Add moving mesh functionality to model moving meshes in a COMSOL Multiphysics model. |
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Deformed Geometry Features (
 ). Add deformed geometry functionality to model deformed geometries in a COMSOL Multiphysics model. |
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Perfectly Matched Layer (PML) (
 ), Infinite Element Domain( ), or Absorbing Layer ( ): Surround your model by a perfectly matched layer, an infinite element domain, or an absorbing layer, behaving as an unbounded extension of the modeling domain. See Infinite Elements, Perfectly Matched Layers, and Absorbing Layers. |
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Ambient Properties (
 ). For specifying ambient properties in simulations as user-defined properties or from meteorological data (the meteorological data requires the Heat Transfer Module or the Subsurface Flow Module). See Ambient Properties in the Heat Transfer Module User’s Guide for more information. |
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Model Input. For specifying a value for a model input locally, overriding its global value from the Default Model Inputs node. See Model Input.
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), which specifies two boundary selections (also available for edges and points as 
) and 
), respectively) that coincide while belonging to different parts of an assembly. Special boundary conditions connect the physics features in the two parts.
). Add 
), 
), and 
) nodes for setting up a topology optimization. This functionality requires the Optimization Module. See the 
). Add 
), 
), 
), 
), 
), and 
) nodes for setting up a shape optimization. This functionality requires the Optimization Module. See the