Need help in Rotation CFX

mouli1991 · July 25, 2013, 10:19

I am new to CFX and i got stuck up with this rotation of sphere about its axis.i searched in google for rotation it says to give immersed solid to my domain.i gave but still it is not rotating..i want to rotate the sphere.Help me with boundary conditions. This is what i gave
Fluid
stationary
inlet velocity 10m/s
outlet pressure

Solid
rotating and also immersed tried seperately
i need a guide from here with explanation..pls pls
very tired of trying

ghorrocks · July 25, 2013, 21:05

If the sphere is rotating about its axis then put a tangential velocity on the sphere wall, and use a normal stationary frame of reference. No need to use immersed solids.

mouli1991 · July 26, 2013, 01:39

I dont undertood the physics of tangential velocity..this velocity just mover around sphere thats it how could it possible to rotate..????

ghorrocks · July 27, 2013, 07:01

If the sphere is rotating about its axis the fluid volume is not moving at all, but the sphere has a tangential velocity which interacts with the flow. So you model this as a stationary domain and the sphere boundary is modelled as a normal stationary wall with a tangential velocity.

July 25, 2013, 10:19	Need help in Rotation CFX	#1
mouli1991 New Member Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 14	I am new to CFX and i got stuck up with this rotation of sphere about its axis.i searched in google for rotation it says to give immersed solid to my domain.i gave but still it is not rotating..i want to rotate the sphere.Help me with boundary conditions. This is what i gave Fluid stationary inlet velocity 10m/s outlet pressure Solid rotating and also immersed tried seperately i need a guide from here with explanation..pls pls very tired of trying

July 26, 2013, 01:39	Tangential Velocity!	#3
mouli1991 New Member Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 14	I dont undertood the physics of tangential velocity..this velocity just mover around sphere thats it how could it possible to rotate..????

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July 25, 2013, 21:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	If the sphere is rotating about its axis then put a tangential velocity on the sphere wall, and use a normal stationary frame of reference. No need to use immersed solids.

July 27, 2013, 07:01		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	If the sphere is rotating about its axis the fluid volume is not moving at all, but the sphere has a tangential velocity which interacts with the flow. So you model this as a stationary domain and the sphere boundary is modelled as a normal stationary wall with a tangential velocity.