Calculation of tangential velocity

lxlylzl.123 · November 12, 2020, 13:18

Hi!

I am simulating swirling flow in a pipe with y-axis coinciding the axis of the pipe. Now I wish to calculate tangential velocity and radial velocity. Probably that could be done by using custom field function. What equations shall I use to calculate the above two velocity components?

Thanks and Regards

lxlylzl.123 · November 13, 2020, 11:56

I would appreciate if any reference related to this is shared.

LoGaL · November 18, 2020, 10:45

It's high school trigonometry with a bunch of sines and cosines, no need to post references. I wrote cylindrical coordinates on google and those are the two first results
i get
https://mathworld.wolfram.com/Cylind...ordinates.html
https://tutorial.math.lamar.edu/clas...calCoords.aspx

Look for more and read. Again, this is simple maths, you can also derive the formulas on your own without any reading, just paper and pen

Kukka · November 18, 2020, 12:13

I wish if I would have performed few simulations during my high-school time itself.

LoGaL · November 18, 2020, 14:13

I did not run CFD in high school.
What I am saying is that to calculate a tangential velocity you need the velocity magnitude and a bit of trigonometry. Really, draw a circle (which is a section of your pipe) and draw a tangential velocity vector, which means the component of velocity perpendicular to the radius and lying on the section of the pipe.

November 12, 2020, 13:18	Calculation of tangential velocity	#1
lxlylzl.123 New Member kukka Join Date: Sep 2018 Posts: 15 Rep Power: 7	Hi! I am simulating swirling flow in a pipe with y-axis coinciding the axis of the pipe. Now I wish to calculate tangential velocity and radial velocity. Probably that could be done by using custom field function. What equations shall I use to calculate the above two velocity components? Thanks and Regards

November 18, 2020, 10:45		#3
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 373 Rep Power: 12	It's high school trigonometry with a bunch of sines and cosines, no need to post references. I wrote cylindrical coordinates on google and those are the two first results i get https://mathworld.wolfram.com/Cylind...ordinates.html https://tutorial.math.lamar.edu/clas...calCoords.aspx Look for more and read. Again, this is simple maths, you can also derive the formulas on your own without any reading, just paper and pen pakk likes this.

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November 13, 2020, 11:56		#2
lxlylzl.123 New Member kukka Join Date: Sep 2018 Posts: 15 Rep Power: 7	I would appreciate if any reference related to this is shared.

November 18, 2020, 12:13		#4
Kukka New Member Join Date: Dec 2017 Posts: 11 Rep Power: 8	I wish if I would have performed few simulations during my high-school time itself.

November 18, 2020, 14:13		#5
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 373 Rep Power: 12	I did not run CFD in high school. What I am saying is that to calculate a tangential velocity you need the velocity magnitude and a bit of trigonometry. Really, draw a circle (which is a section of your pipe) and draw a tangential velocity vector, which means the component of velocity perpendicular to the radius and lying on the section of the pipe.