CFX-Post Variables

LKF

I have discovered what appears to be an inconsistency between the Velocity variables in CFX-Post. I assume that: Velocity = sqrt[(Velocity u)^2 + (Velocity v)^2 + (Velocity w)^2]

Using either areaAve or massFlowAve I get the following data:

areaAve( Velocity u ) 8606.64 [ ft min^-1 ]

areaAve( Velocity v ) 80.62 [ ft min^-1 ]

areaAve( Velocity w ) -213.75 [ ft min^-1 ]

areaAve( Velocity ) 9738.15 [ ft min^-1 ]

However, calculation of the magnitude using the formula above gives a value of: 8609.67 [ft min^-1].

Strangely the areaAve Velocity value of 9738.15 [ft min^-1] is closer to the expected velocity of 9620 [ft min^-1] based on the flow area and the u-direction mass flow rate boundary condition I've applied.

Does anyone have an explanation for this?

I haven't been able to find a mathematical definition for Velocity in the CFX documentation.