Rotating pipe analysis

hamed.majeed · October 23, 2018, 20:16

Water flow in a pipe from P1 to P2, where P1>P2. The pipe is rotating about the axis shown in figure. How to analyze such a problem!

In addition to the frictional loses, the flow has to overcome the centrifugal force!

what is the chemical name of alum

Duke711 · October 23, 2018, 21:10

With mesh motion under cell zone conditions

hamed.majeed · October 27, 2018, 15:22

Quote:

Originally Posted by Duke711

With mesh motion under cell zone conditions

Can't I define it as a moving reference frame case? Thank you.

Duke711 · October 28, 2018, 14:21

No, moving frame are only moves the coodinate system -> sliding wall, no effect of the mass moment of inertia from the fluid.

LuckyTran · October 29, 2018, 09:18

Even easier is to just go to boundary conditions and make it a moving wall. No need for the mesh to move.

Moving reference frame does not provide the motion. But you probably should use a moving reference frame anyway for post-processing purposes so that you do not need to decompose the velocity field into the rotating part and relative part.

October 23, 2018, 20:16	Rotating pipe analysis	#1
hamed.majeed Senior Member Hamed Abdul Majeed Join Date: May 2012 Location: New Orleans, LA, US Posts: 147 Rep Power: 14	Water flow in a pipe from P1 to P2, where P1>P2. The pipe is rotating about the axis shown in figure. How to analyze such a problem! In addition to the frictional loses, the flow has to overcome the centrifugal force! what is the chemical name of alum

October 23, 2018, 21:10		#2
Duke711 Member Join Date: Dec 2016 Posts: 44 Rep Power: 10	With mesh motion under cell zone conditions hamed.majeed likes this.

October 28, 2018, 14:21		#4
Duke711 Member Join Date: Dec 2016 Posts: 44 Rep Power: 10	No, moving frame are only moves the coodinate system -> sliding wall, no effect of the mass moment of inertia from the fluid. hamed.majeed likes this. Last edited by Duke711; October 28, 2018 at 21:13.

October 29, 2018, 09:18		#5
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,762 Rep Power: 66	Even easier is to just go to boundary conditions and make it a moving wall. No need for the mesh to move. Moving reference frame does not provide the motion. But you probably should use a moving reference frame anyway for post-processing purposes so that you do not need to decompose the velocity field into the rotating part and relative part. HHK likes this.

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