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-   -   How to calculate swirl velocity (http://www.cfd-online.com/Forums/star-ccm/65401-how-calculate-swirl-velocity.html)

hamoudi June 13, 2009 10:30

How to calculate swirl velocity
 
Hello Everybody,

please, could any one tell me how to calculate Swirl Velocity

I have and radial and tangential velocities


Thanck you very much

sabrina February 4, 2015 06:44

Quote:

Originally Posted by hamoudi (Post 219200)
Hello Everybody,

please, could any one tell me how to calculate Swirl Velocity

I have and radial and tangential velocities


Thanck you very much

please, if you have found a method, please tell me, I have the same problem, slip velocity and temperature jump

MBdonCFD March 2, 2015 14:25

Quote:

Originally Posted by sabrina (Post 530329)
please, if you have found a method, please tell me, I have the same problem, slip velocity and temperature jump


Unless I am mistaken, swirl velocity is just another term for tangential velocity. The only trick in extracting it from star-ccm+ is making sure that the axis definition for your region is correct. Otherwise your velocities might not make any sense.

That being said, if you mean to ask how to calculate the angular velocity (i.e. rpm, rad/s, etc) all you have to do is define a field function. Specifically:

$TangentialVelocity/$RadialCoordinate (i.e. omega=Vt/r).

Then you can either get the volume or mass average of the fluid in your duct OR setup a mass flow average report that gives it at a plane.


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