[abhinav.abhi19]

Hi,
Few days back I posted a thread on how to calculate swirl number in Fluent.
I contacted Ansys support and here is the way. I hope it will help others:

The swirl number is defined as the radius-weighted ratio of axial flux of angular momentum to the axial flux of axial momentum.

SWIRL_NUMBER = FLOWRATE(radius*tangential-velocity) / FLOWRATE(radius*axial-velocity)

You can use custom field functions to obtain radius*tangential-velocity and radius*axial-velocity.
Some users use a reference radius in the denominator such that:
Denominator = radius_ref*FLOWRATE(axial-velocity)

[soogeng]

thanks a lot for the definition.

i am modelling a cyclone separator unit and is interested in obtaining the swirl number decay downstream.

I am however having a difficulty in obtaining the radius weighted and flow rate in custom field function.

Thanx a bunch

[2pashtet]

Hi all,

Originally Posted by abhinav.abhi19

SWIRL_NUMBER = FLOWRATE(radius*tangential-velocity) / FLOWRATE(radius*axial-velocity)
Denominator = radius_ref*FLOWRATE(axial-velocity)

Tell me, please, how can I define function FLOWRATE() ?

[2pashtet]

Hi all,
Tell me please, how can I calculate radius on the surface?

[rfavalli]

Thank you Abhi. It's been very useful!