Case sensitivity in expressions

The expression system is generally case insensitive with exceptions noted in the following table.

Type of expression input	Case sensitivity
Expression names	See Expression names
Mathematical functions	Insensitive
Lookup functions	Insensitive
Utility functions	Insensitive
Thermal-flow functions	Insensitive
Units	See Units
Variables(1)	Sensitive
Fields(2)	Sensitive
(1) In expressions, variables are used as the argument for the UG_VAR function. For more information on the UG_VAR function, see Lookup functions in expressions. (2) In expressions, fields are used as an argument for the FD or FDM functions. For more information on these functions, see Lookup functions in expressions.

Expression names

Expression names are generally case insensitive. Thus, the software prevents you from creating an expression named Aa when a dimensional expression named AA or aa or aA exists.

The exception to this rule is that if a dimensionless (unitless) expression named AA exists, the software allows you to create a dimensional or dimensionless expression named Aa or aA or aa.

As a best practice, avoid using case to differentiate expression names. When a naming conflict exists among expressions, you can configure the software to issue a warning and prevent the solve from proceeding. Use the List Expression and Units Inconsistency Warnings customer default to cause the software to do the following:

• Issue a warning message when you create an expression whose name is the same as an existing unitless expression except for the case of letters.For example, if you create an expression named Aa and a unitless expression named AA or aa or aA exists, the software issues a warning message.

• Issue a warning message when you load a FEM or Simulation file that contains a unitless expression and another expression that has the same name except for the case of the letters.For example, if you load a file that contains a unitless expression named Aa and another expression named AA or aa or aA, the software issues a warning message.

• Terminate a solve when the simulation contains a unitless expression and another expression that has the same name except for the case of the letters.For example, if your simulation contains a unitless expression named Aa and another expression named AA or aa or aA, when you attempt to solve, the software terminates the solve. When this occurs, the software describes the naming conflict in the Information window.

• Include the Check Warnings command in the Expressions dialog box.When you click Check Warnings , if a naming conflict exists, the software opens the Information window with a list of the conflicts.

Units

Not all units are case insensitive. Thus, when entering units in an expression, as a best practice, do one of the following:

• Use the auto-complete suggestion for the unit.

• Use the case for the unit as shown in the Units Manager dialog box.

Where do I find it?

Selecting the List Expression and Units Inconsistency Warnings customer default

Application	Pre/Post
Prerequisite	A Simulation file or FEM file as the work part and displayed part
Customer Default	File→Utilities→Customer Defaults→Pre/Post tab→Expressions→List Expression and Units Inconsistency Warnings check box

Opening the Units Manager dialog box

Application	Pre/Post
Prerequisite	A Simulation file or FEM file as the work part and displayed part
Menu	Tools→Units Manager

How do I

Create a user-defined expression

Create a system-defined expression

Create an expression for a measurement

Replace an expression in a formula

Test an expression

Generate a contour plot of an expression

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Expressions

System-defined and user-defined expressions

Domains

Using expressions to define boundary conditions

Finding where expressions are used

Boundary condition ID in expressions

Using unit normal vector components as variables in expressions

Special consideration when importing expressions

Specifying the default value for variables and plug-in functions

Generating a contour plot of an expression

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Example of an expression

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Case sensitivity in expressions, Simcenter 3D 2021.1 Series

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