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az_f May 21, 2009 01:24

MassflowAve & areaAve in cfx
Hi All,
I want to calculate the total pressure difference at inlet , outlet and mid plane of one tube with blood flow. I used areAve(total pressure )@inlet and... but I don't the results calculated by massflowAve is different with AreaAve and which one is more accurate?

Any idea?


pantarei83 May 21, 2009 06:26

High diffrence?
The two values are very different? If you considered the fluid incompressible they must be similar. Otherwise I think mass flow ave is better.

ghorrocks May 21, 2009 19:27


The massflowAve is a mass weighted average. This is best for things which are related to mass, such as species concentrations, volume fractions, temperature. The areaAve is an area weighted average. This is best for things which are area functions, like pressure. So for pressure I would use the areaAve pressure to calculate the inlet and outlet pressures.

Glenn Horrocks

LKF May 22, 2009 13:40

I think this link offers a fairly good explanation of the difference between the two averaging methods.

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