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

sliding meshes with periodic BC's

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 9, 2003, 02:33
Default sliding meshes with periodic BC's
  #1
Dan Brozozowski
Guest
 
Posts: n/a
Section 9.5.3 of the User's Guide says the following: "If you are modelling a rotor/stator geometry using periodicity, the periodic angle of the mesh around the rotor blade(s) must be the same as that of the mesh around the stationary vane(s)."

I'm trying to model a single rotor/stator section of an axial pump in Fluent 6 using the sliding mesh technique. (Right now I'm just doing a 2D model at the midspan of the blades.)

My sliding mesh consists of a single channel from the rotor section and a single channel from the stator section.

The problem is that the rotor and stator have different numbers of blades (i.e. the rotor blades are spaced farther apart than the stator blades) so the interfacing boundaries of the two meshes have different lengths. So, for the reasons listed above from ing user's manual, Fluent does not accept this mesh.

It seems like there must be a way to solve this without modelling all the rotor/stator blades. Any suggestions?

Thanks!

Dan
  Reply With Quote

Old   June 26, 2003, 03:35
Default Re: sliding meshes with periodic BC's
  #2
senthil
Guest
 
Posts: n/a
hi, Before answering your question, could you plese tell me why you choose sliding mesh theroy. Its for unsteady case and moreover to capture the stong interaction of stator and rotor. I don't know much about the sliding mesh theory. But i'm also working on rotor stator problem using mixing plane theroy. THis you can try out, but only this is this is steady state anlalysis. And this will take care of diffenent interface lenghts (mixing plane).

senthil.
  Reply With Quote

Old   June 26, 2003, 14:01
Default Re: sliding meshes with periodic BC's
  #3
Dan Brzozowski
Guest
 
Posts: n/a
Senthil,

Yes, we are looking specifically at strong rotor-stator interaction. This page contains a good description of the machine I'm modelling:

http://www.me.jhu.edu/~lefd/turbo/turbo.htm

As I said before it's an axial turbopump with 12 rotor blades and 17 stator blades. The animations on the page are from the actual experimental data observed using Particle Image Velocimety (but this is a CFD forurm so I'll just leave it at that...)

Should I consider using the mixing plane approach? Can I still do unsteady analysis with that?

Dan
  Reply With Quote

Old   June 27, 2003, 07:10
Default Re: sliding meshes with periodic BC's
  #4
senthil
Guest
 
Posts: n/a
Dan, I look at the site you mentioned. Its great work.

Since you are intrested in rotor-stator interaction, Mixing plane will not work, as it is a steadt state asumption. The sliding mesh model is appropriate model to capture the interaction.

Senthil.

  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
Link faces meshes for periodic BC with ANSYS WORKBENCH mawi01 ANSYS Meshing & Geometry 3 April 9, 2015 16:42
CFD of propeller with sliding meshes ivanddd Main CFD Forum 1 April 19, 2011 13:30
Periodic BCs for flow through body centered cubic Luigi_ STAR-CCM+ 1 January 26, 2011 05:48
Pressure BCs or Periodic BCs for model of frost on vertical surface? andy.eco FLUENT 2 March 26, 2010 03:02
Periodic BC's for Thermal Lattice Boltzmann Method anuhar Main CFD Forum 0 May 4, 2009 03:45


All times are GMT -4. The time now is 04:55.