CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

rotating wall

Register Blogs Community New Posts Updated Threads Search

Like Tree1Likes
  • 1 Post By eric

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 16, 2003, 08:59
Default rotating wall
  #1
eric
Guest
 
Posts: n/a
Hi all,

I have a flow through a rotating drum, similiar to a rotating cement/lime kiln. The drum is rotating at 0.21 rad/s and the inlet velocity is 18m/s.

I want to know what effect the rotation has on the flow, and if it is necessary to account for the rotation?

Can i use steady state model and simply set the wall rotating in the boundary conditions at 0.21rad/s?????

Can anyone give me advice on what to do?

thanks,

Eric
Nasos_bal likes this.
  Reply With Quote

Old   September 16, 2003, 09:02
Default Re: rotating wall
  #2
david
Guest
 
Posts: n/a
No you can't use steady state

DC
  Reply With Quote

Old   September 16, 2003, 09:11
Default Re: rotating wall
  #3
prasat
Guest
 
Posts: n/a
Hi I think as first approximation just use steady stae and run for large time and then see whether the problems in really steady state or not. If you are not convenced then probabaly use unsteady case and do the simulation
  Reply With Quote

Old   September 16, 2003, 10:13
Default Re: rotating wall
  #4
eric
Guest
 
Posts: n/a
Thanks guys,

What about using multiple reference frames is that possible? will it produce the same effect?

I think the fact that the drum is rotating so slowly that maybe the steady state approximation, using MRF, may be possible!

What are you views???

Thanks, Eric
  Reply With Quote

Old   September 16, 2003, 12:48
Default Re: rotating wall
  #5
ap
Guest
 
Posts: n/a
I agree, I don't think you can properly represent your case using a steady calculation.

Hi

ap
  Reply With Quote

Old   September 17, 2003, 06:19
Default Re: rotating wall
  #6
eric
Guest
 
Posts: n/a
Thank for your advice,

I will try an unsteady simulation.

My model consists of a windbox, which stationary, then the rotating drum and then into a stationary exit. The flow enters at the windbox, flows through the rotating drum and exits.

Can i follow the same method as that in the "Using VOF model" tutorial for unsteady flow, i.e. solver = unsteady and wall boundary condition = moving wall/rotation????

I ask because in that tutorial above, the whole system is rotating where as my domain has both stationary and rotating components.

Thanks for your help

Eric
  Reply With Quote

Old   September 17, 2003, 09:10
Default Re: rotating wall
  #7
ap
Guest
 
Posts: n/a
The procedure should be the same of the tutorial case, but when you generate the grid in GAMBIT, you have to assign separate wall boundary conditions to the rotating wall and to the stationary one.

Hi

ap
  Reply With Quote

Old   September 17, 2003, 09:54
Default Re: rotating wall
  #8
eric
Guest
 
Posts: n/a
Yes seperate walls. Just to confirm - I should have a wall to represent the rotating walls and another wall to represent the stationary walls?

How do i know that the walls have actually rotated, will the post-processing show the rotation of the wall or show the wall at different angle after x time steps???

Thanks ap

Eric
  Reply With Quote

Old   September 20, 2003, 18:49
Default Re: rotating wall
  #9
ap
Guest
 
Posts: n/a
I think you should see the influence of rotation on the flow. I don't know if there is a way to see wall rotation in other ways.

Hi

ap
  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Thin Wall Heat Transfer BC for rhoSimpleFoam swahono OpenFOAM Running, Solving & CFD 12 October 4, 2013 12:49
[Commercial meshers] tmerge utility creates unwanted interface/walls comes in the final mesh Shoonya OpenFOAM Meshing & Mesh Conversion 11 January 20, 2012 07:23
Difference between domain motion and rotating wall 100tinela CFX 6 January 31, 2011 17:53
rotating wall enomis77 FLUENT 2 August 27, 2010 03:52
pimpleDyMFoam with rotating wall tikulju OpenFOAM 0 October 19, 2009 06:37


All times are GMT -4. The time now is 22:13.