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Name: the name of the variable.
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Expression: the expression, using COMSOL syntax, that defines the variable.
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Unit: the unit for the variable (in the active unit system). If the unit of the expression does not match the unit of the variable, the expression is displayed in orange.
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Description: a description of the variable.
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Selection: the geometric entities (domains, boundaries, edges, or points) where the variable is defined (Domain 1, for example).
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Details: this column contains some details about the variable’s behavior. See About the Details Column below.
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If you click a single variable, its selection, as indicated in the Selection column, appears in the Graphics window.
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Name: the name of the variable.
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Shape function: the type of shape function (element) for the variable (for example, Lagrange for Lagrange elements, which are the most common elements).
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Unit: the unit for the variable (in the active unit system).
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Description: a description of the variable.
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Shape frame: the frame type (typically either a spatial or a material frame) for the shape function.
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Selection: the geometric entities (domains, boundaries, edges, or points) where the shape function is defined (Domain 1, for example).
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Details: This column contains some details about the shape function’s behavior. See About the Details Column below.
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Weak expression, the equation expressed in a weak formulation. It is possible to modify these expressions, but you then override the equation as specified by the physics interface, and a warning appears in the leftmost column of the table.
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Integration order, the order for the integration of the weak expression (see integration order in the Glossary). Polynomials of at most the given integration order are integrated without systematic errors. For smooth expressions, a sufficient integration order is typically twice the order of the shape function. For example, the default integration order for second-order Lagrange elements is 4. You can modify the integration order if desired. A warning then appears in the leftmost column of the table to indicate that the predefined order has been changed.
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Frame, the frame type (typically either a spatial or a material frame) used when integrating the expression.
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Selection: the geometric entities (domains, boundaries, edges, or points) where the weak expression is defined (Domain 1, for example).
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Constraint: the expression for the constraint.
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Constraint force: the expression that defines the associated constraint force, which is typically the test function of the constraint.
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Shape function: the type of shape function (element) for the constraint (for example, Lagrange for Lagrange elements).
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Selection: the geometric entities (domains, boundaries, edges, or points) where the constraint is defined (Boundaries 1–5, for example).
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+ operation indicates that overlapping contributions are added.
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For some variables, Meta indicates that the variable definitions are not fully updated until you solve the model. It is therefore not possible to edit the expressions for such variables.
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In rare cases, other operations (* operation, for example) can occur.
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Slit means that the shape function creates a slit for the degree of freedom.
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