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How to calculate swirl velocity or angular velocity in a in-cylinder flow analysis us

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Old   February 23, 2016, 11:07
Default How to calculate swirl velocity or angular velocity in a in-cylinder flow analysis us
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Gomathi shankar
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I am doing an in-cylinder steady state flow analysis. In that I need to calculate the angular velocity of air rotating
about the cylinder axis. I have been using a custom field function to monitor the velocity. The field function is
given as: (x*Vz-z*Vx)/(x*x+z*z). While using this field function the velocity fluctuates between a maximum and
minimum valve. It does not settle or converge even the solution is converged.

I need to know whether the field function is correct or wrong? Why the value fluctuates?

I really need this explanation which will help me in my project work.
If anybody experienced this same issue, please let me know.
Thanks in advance.
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Old   February 23, 2016, 13:25
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Matt
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Depending on what software you are using, you can probably setup a cylindrical coordinate system and then treat it just like x y z components except get axial, tangential and radial flow velocities.
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Old   April 26, 2017, 16:55
Default Curl of the velocity field
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Muhammad Zahid
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You have to calculate \nabla\timesV, i.e curl of the velocity field.
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