CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Simulate rotating Fan using no MRF

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 13, 2016, 16:47
Default Simulate rotating Fan using no MRF
Join Date: Oct 2015
Posts: 56
Rep Power: 10
federernadal is on a distinguished road
So I dont have a multiple reference frame license.

I am trying to rotate a fan to see fan air patterns on a design.

So here is a model of a centrifugal fan –

So I drew up an enclosure around it, imprinted a face for the inlet and set up the fan body as a solid domain, while the enclosure body as a fluid domain. The default interface is set up.

Enclosure –

Fan (I made a new coordinate system as shown and set it to rotate about the Z axis) –

The solution converges, but it didn’t do what I wanted it to do. Air just blows right past the fan.

How would I get the correct fan profiles? Any approach I could use?
Attached Images
File Type: jpg centfan.jpg (19.0 KB, 13 views)
File Type: jpg setup1.jpg (64.4 KB, 12 views)
File Type: jpg setup2.jpg (69.0 KB, 11 views)
File Type: jpg result.jpg (85.3 KB, 11 views)
federernadal is offline   Reply With Quote

Old   September 14, 2016, 04:21
New Member
Michael Brooker
Join Date: Feb 2016
Posts: 6
Rep Power: 10
Michael B is on a distinguished road
Something to consider is when you rotate a domain in this fashion it is not moving the mesh, merely the fluid physics for instance. So rotating a solid domain I imagine would just be moving the solid physics around the object which wouldn't do anything to my knowledge. As for why the flow is traveling through the object, i'm not sure. I usually would only mesh the fluid domain and this would be fine but you would still have the same problem in that you couldn't rotate the object in this fashion. In order to not use MFR you would need a dynamically moving mesh which I don't have any experience with unfortunately but is a lot harder than MFR.
Michael B is offline   Reply With Quote

Old   May 3, 2018, 00:11
Default Reg No MRF
New Member
Join Date: May 2012
Posts: 11
Rep Power: 14
sathishkrazy is on a distinguished road
Can we simulate a rotating region (fan) in steady state without creating/seperating it from steady zone, like without creating MRF.


Say we dont have enough clearance between rotating region and stationary region to create interface. what would be the possible solution for this?
sathishkrazy is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Which CFD package suitable for beginner to simulate fluid flow from a cpu fan sf227 Main CFD Forum 0 January 13, 2016 04:06
Simulation of Radial Fan with simpleFoam MRF nash OpenFOAM Running, Solving & CFD 2 November 5, 2015 10:12
Beginner question: How to simulate a fan in a pipe? Hansemann OpenFOAM Running, Solving & CFD 0 March 8, 2014 02:58
Boundary conditions for rotating fan rohit FLUENT 5 July 24, 2008 00:26
Boundary conditions for rotating fan rohit CFX 2 July 22, 2008 09:20

All times are GMT -4. The time now is 09:22.