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

Rotating Fluids

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 17, 2007, 11:20
Default Rotating Fluids
  #1
Xiana
Guest
 
Posts: n/a
Hi, does anyone simulate rotating fluids? Im trying to simulate the flow inside a tubular centrifuge but I have a lot of convergence problems up a certain Reynolds number (1000). I use Reynolds stress model to simulate the turbulences. I would appreciate any help!

Xiana
  Reply With Quote

Old   July 17, 2007, 12:23
Default Re: Rotating Fluids
  #2
Joe
Guest
 
Posts: n/a
Initialise your RSM model with an isotropic turbulence model's results.
  Reply With Quote

Old   July 17, 2007, 13:47
Default Re: Rotating Fluids
  #3
Ressel
Guest
 
Posts: n/a
I would try... check the mesh refined and time step.

  Reply With Quote

Old   July 18, 2007, 16:20
Default Re: Rotating Fluids
  #4
red lemon
Guest
 
Posts: n/a
Also try FMG initialisation and run with PRESTO if using pressure based solver
  Reply With Quote

Old   July 19, 2007, 04:14
Default Re: Rotating Fluids
  #5
garima chaudhary
Guest
 
Posts: n/a
first of all u need to know by the data (i mean any experimental data availabe or any information available ) whether u r in turbulkent regime or not if not then y r u using turbulence model. i m also working in cfd field on centrifugal rotators only, but does ur system contains 2 fluids or only single fluid wat is the system can u tell me in detail , bcoz my system consists of 2 fluids, hence me using vof model , anyway tell me wat is the system
  Reply With Quote

Old   July 19, 2007, 07:00
Default Re: Rotating Fluids
  #6
Xiana
Guest
 
Posts: n/a
Thank you for your advices. The problem is that I have no yet experimental data (Im working on it but its going to go for a long time.Ive tried with turbulence models because it didnt converged with laminar, but i think the problem is there. I simulate only one fluid and then, when streams are converged, I make some particle injections (concentration is very low and DPM works good). I simulated the interface fluid-air once with the VOF model and now I define this interface as a wall with no shear stress. The external wall and the blades of the centrifuge are moving walls and the fluid rotate in a moving reference frame. Do you think is a good formulation?

Xiana
  Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rotating Impeller Naith FloEFD, FloWorks & FloTHERM 22 November 5, 2012 09:53
Vertical Axis Wind Turbine Rotating Domain Problems TWaung CFX 4 May 1, 2012 03:14
rotating fluids SD@TUB OpenFOAM 16 September 8, 2011 01:55
question about governing equation in CFX using rotating/non rotating reference frame rystokes CFX 0 January 12, 2010 07:14
Motion of solids in rotating fluids Fredrik Kuivinen Main CFD Forum 2 July 6, 2000 12:40


All times are GMT -4. The time now is 07:35.