13.5.1. Function Selection

The quantitative functions available from the Function Calculator in CFD-Post are integrated into CEL and can be used in any expression.

The available quantitative functions are outlined in the table below.

Function Name	Operation
area	Area of location
areaAve	Area-weighted average Note: Projected areaAve (for example, areaAve_x) works as expected only for surfaces that do not fold in the selected direction. In extreme case, if the surface is fully closed, the projected average will result in a randomly large number, as the projected area will be zero.
areaInt	Area-weighted integral (can be projected to a direction)
ave	Arithmetic average
count	Number of Nodes
countTrue	Number of nodes at which the logical expression evaluates to true.
force	Force on a surface in the specified direction
forceNorm	Length normalized force on a curve in the specified direction
length	Length of a line
lengthAve	Length-weighted average
lengthInt	Length-weighted integration
massFlow	Total mass flow Note: Mass flow convention for CFD-Post is negative in the direction of the surface normal.
massFlowAve	Mass Flow-weighted average
massFlowAveAbs	Mass Flow-weighted average with absolute values of mass flow used in numerator and denominator of formula for averaging
massFlowInt	Mass Flow-weighted integral
maxVal	Maximum Value
minVal	Minimum Value
probe	Value at a point
sum	Sum over the calculation points
torque	Torque on a surface about the specified axis
volume	Volume of a 3D location
volumeAve	Volume-weighted average
volumeInt	Volume-weighted integral Note: The volumeInt function does not take into account the porosity of the location specified for porous domains. To include the porosity effect in your calculation, you need to manually multiply your argument by: The Volume Porosity if you want to evaluate the integral on the fluid side (1-Volume Porosity) if you want to evaluate the integral on the solid side

For details on each of the functions listed in the table above, see Quantitative Function List in the CFX Reference Guide.