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?

Thanks

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.

Hi

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

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

http://www.cfd-online.com/Forums/cfx...a-average.html