A user function can be used in CEL expressions in any place in which a standard CEL function (for example, sin, cos, step, and so on) can be used. For a profile data function or an Interpolation (Data Input) function, you can enter an expression using the notation:
<Function Name>.<Value Field Name>(arg1[units], arg2[units], …)
or
<Function Name>.<Parameter Name>()
where:
<Value Field Name>identifies which column of data from the profile data file should be used, and<Parameter Name>identifies which parameter from the profile data file should be used.
The allowed values are shown when editing the user function. When using a system variable, an expression, or a value, you do not need to specify units. For example, a pipe pressure profile might be set by entering:
inletvelocity.Total Pressure(r)
if the profile data file contains a profile labelled "inletvelocity" with a data column labelled "Total Pressure".