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Old   September 26, 2014, 03:11
Default Vorticity, swirl etc.
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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!
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