[Jiricbeng]

Hi,
I would like to monitor a variable that would give me an answer to how much fluid rotates in a pipe. Lets say the pipe is in the X direction and positive direction of flow is in X+. And the fluid little bit rotates around X axis. I created cross-section perpendicular to the X direction, and I want to monitor some variable corresponding with the fluid rotation.
Neither on web nor in help I cant find any reasonable explanation of velocity.swirling normal, velocity.swirling normal X, velocity.swirling strength, velocity.swirling vector etc. I only found out what velocity.curl is. However I am still not quite sure about it, as in a pipe where I have nearly no rotation, velocity.curl gives much higher values than velocity.curl X,Y,Z.

Thank in advance!

[Javons Wong]

Hi there. Have you solved your problem? I also want to know the answer.

[Gert-Jan]

What about areaAve(sqrt(Velocity v^2 + Velocity w^2)/max(abs(Velocity u),0.01[m/s]))@outlet
Of just monitor the v and w components, As an indication.........

[Opaque]

https://guilindner.github.io/VortexF...istic_equation

Though intended for something else, the summary and the references are a great starting point.