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 April 17, 2006, 21:49 About rigid-body solution? #1 billpeace Guest   Posts: n/a Sponsored Links I want to simulate flow in a centrifuge, that was described as a hollow vertical cylinder which rotates very rapidly around its axis. The flow is described by the Navier-Stockes equations and can cfx get a rigid-body solution?

 April 18, 2006, 17:42 Re: About rigid-body solution? #2 Glenn Horrocks Guest   Posts: n/a Hi, What do you mean by a rigid body solution? Do you mean the flow is solid body rotation? If this is the physical solution and you set the simulation correctly up in CFX then it should be able to be done. Glenn Horrocks

 April 18, 2006, 21:01 Re: About rigid-body solution? #3 billpeace Guest   Posts: n/a Yes.The flow have the same azimuthal acceleration with the cylinder.I don't know how to set the simulation with respect to "solid body rotation". Domain motion was set as rotating,heat transfer model was set as total energy,turbulence model was set as none(leminar).

 April 19, 2006, 00:05 Re: About rigid-body solution? #4 billpeace Guest   Posts: n/a Sorry for i have a mistake in previous post. "the same azimuthal acceleration" should change to "the same azimuthal velocity per radius"

 April 19, 2006, 18:26 Re: About rigid-body solution? #5 Glenn Horrocks Guest   Posts: n/a Hi, You sound like you are doing a rotating frame of reference simulation. CFX supports this, read the documentation on rotating frame of reference. Glenn Horrocks

 April 20, 2006, 07:50 Re: About rigid-body solution? #6 billpeace Guest   Posts: n/a Hi, en,I am doing a rotating frame of reference simulation. I want to calaulate flow in the vertical cylinder which rotated rapidly around its axis.Assume first that we have a single perfect gas in th rotating cylinder. The result motion of the gas is the well-known isothermal "rigid body rotation" or "wheel flow".The gas rotates as a rigid body with velocity components Vz=0 Vr=0 V(angular)=ωr Can cfx simulate this problem?

 April 20, 2006, 18:24 Re: About rigid-body solution? #7 Glenn Horrocks Guest   Posts: n/a Yes.

 April 20, 2006, 20:17 Re: About rigid-body solution? #8 billpeace Guest   Posts: n/a Now, The big problem is that how to ensure the gas have the same angular velocity with the cylinder? Can you give me some advice to simulate such problem,thanks

 April 23, 2006, 18:49 Re: About rigid-body solution? #9 Glenn Horrocks Guest   Posts: n/a Hi, Set it as an initial condition and let CFX work it out from there. Glenn Horrocks

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