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

Rotating Frame Stationary Vaneless Diffuser?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 23, 2014, 12:22
Default Rotating Frame Stationary Vaneless Diffuser?
  #1
Member
 
Kevin Hoopes
Join Date: Oct 2010
Posts: 40
Rep Power: 7
khoopes is on a distinguished road
I have a centrifugal impeller with a vaneless diffuser. It is simple in turbogrid to create a mesh that encompasses both impeller and diffuser with separate hub and shroud surfaces for the impeller and diffuser sections. My question is since it is one mesh, I have to solve the entire domain in the same reference frame. Is it possible or advisable to solve the entire domain in the rotating frame and set the diffuser hub and shroud surfaces as counter-rotating walls? This is not just an abstract question as I have already done many of these simulations like this and am now questioning the method.

Thanks,

Kevin
khoopes is offline   Reply With Quote

Old   July 23, 2014, 18:02
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,651
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Yes, this is an acceptable method. In fact I would even say that if it is appropriate I would say it is the recommended method as it means you do not need a GGI in a critical part of the flow.

To be sure you should do a simulation with and without the frame change and check they are equivalent.
ghorrocks is offline   Reply With Quote

Old   July 24, 2014, 10:20
Default
  #3
Member
 
Kevin Hoopes
Join Date: Oct 2010
Posts: 40
Rep Power: 7
khoopes is on a distinguished road
Thank you for your reply. Since I posted this yesterday I did a simulation with a split rotor and diffuser for comparison and the results look very similar. The metric that I am concerned with in this simulation was withing 0.5% which is fine for my application.
khoopes is offline   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 rotor inside a frame wllmk1 OpenFOAM 38 April 8, 2014 06:58
Viewing Rotating and Stationary Domains in Post tango711 CFX 1 August 23, 2012 08:09
Rotating Reference Frame Pressure Gradient clac FLUENT 0 August 22, 2012 18:20
Different solutions for Rotating Reference Frame fafou09 FLUENT 1 July 24, 2012 10:06
question about governing equation in CFX using rotating/non rotating reference frame rystokes CFX 0 January 12, 2010 07:14


All times are GMT -4. The time now is 17:07.