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Click the Replace Expression () button to select a predefined quantity from the tree of expressions that opens and then replace the contents of the current row in the Expression table with the corresponding variable. For postprocessing features where you input an array of expressions (for example, Global plots and most numerical evaluation features), choose All expressions in this group for groups with many related quantities such as vector and tensor components to add all quantities in the group to the table of expressions.
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Click the Add Expression () button to add the corresponding variable to the next row in the Expression table. Otherwise, this option is similar to the Replace Expression option.
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The Unit for the expression appears automatically if you replace or add a predefined expression. You can click in the unit’s text field and type a compatible unit for the quantity if there is no unit defined or if you want to change the unit. If you use an incompatible unit, it is ignored and replaced by the default unit.
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Click in the Description field in a row to enter a description (or edit the default) for the corresponding expression.
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Click the Replace Expression () button to select a predefined quantity from the tree of expressions that opens and then replace the contents of the Expression field with the corresponding variable.
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Click the Insert Expression () button to insert the corresponding variable at the current position in the Expression field (you can also use Ctrl+Space).
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Select a Unit from the list. You can select from a predefined number of applicable units for the quantity that the variable represents, but you can also click in the unit’s text field and type any compatible unit for that quantity to use a unit that is not in the list (for example, mi/h for miles per hour as a unit for a velocity quantity).
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Select the Description check box to enter a description (or edit the default).
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A Built In group with built-in functions and operators:
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A list of available Mathematical Functions such as trigonometric functions.
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A list of available Operators, divided into Differentiation; Evaluation; Expressions; Integral, average, and sum; Linearization, Other; and Scoped evaluation.
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A Model group with quantities and variables related to the model:
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For Component 1 (and any other components in the model), each physics interface has its own list of predefined quantities. In addition, there is a Definitions list with variables for coordinate systems and user-defined variables, a Geometry list with geometry variables local to the component such as normal and tangent components, and, if applicable, a Global list with global (scalar) quantities defined by the physics interfaces.
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A Geometry list with geometry variables such as the spatial coordinates and the domain index.
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A Global Definitions list with user-defined parameters and variables and a variable for the number of DOFs.
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A Mesh list with mesh variables such as element size and element quality.
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A Solver list with variables for the time, eigenvalue, and frequency (when applicable).
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Type a filter text in the text field at the top of the list of predefined expressions to filter the list to only include the quantities that match the filter text. Using a filter text can help you find a predefined quantity of interest without having to search through the full list of quantities. You can type the name of the predefined expression (for example, atan2) or the description (for example, inverse tangent) in the filter text for the Insert Expression and Replace Expression lists to search for a specific predefined expression. When you type Ctrl+Space in a text field, you can filter the list using the name of the predefined expression.
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Principal stress/strain plots (Principal Stress Volume, Principal Stress Surface, and Principal Stress Line)
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