CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Pre-Processing

faceZone or cellZone for MRF

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

LinkBack Thread Tools Display Modes
Old   August 15, 2013, 03:22
Default faceZone or cellZone for MRF
Join Date: Aug 2013
Posts: 50
Rep Power: 6
nash is on a distinguished road
Sponsored Links
hi everyone,

i read in MRFZone.H that cellZone will be defined as MRFZone and faceZone can also optionally be assigned as MRFZone.

my question is when is faceZone is needed as MRFZone?

in my studies of radial blower simulation, cellZone and faceZone are generated within sHM using STL (cylinder for my MRF Zone)

sofar i have set cellZone for the MRFZone in fvOptionsDict and the simulation ran okay sofar.

in my case, should i set faceZone as well for the MRFZone in fvOptionDict ?
when one needs to use the faceZone? just wondering why faceZone is also given in sHMDict


Quote: reating_a_cellZone_and_faceZone_that_define_the_ro tating_part_of_the_mesh

''When a face is considered rotating in MRFSimpleFoam, the flux on this face will get an extra term, the Coriolis term, and the flux equation will be solved with this term. As a boundary face, ( such as a face on a wall ) is not rotating, adding the Coriolis term for those faces would be wrong''
Adding patches for surface regions 
Patch    Type    Region 
-----    ----    ------ 
5    wall    fan_rotor-layersides 
6    wall    fan_rotor-mrf-02 
7    wall    fan_casing-schwarz-03 
8    wall    fan_rotor-mrf-layer-02 
9    wall    fan_rotor-mrf-01 
10    wall    fan_casing 
11    wall    fan_plane 
12    wall    fan_inlet 
13    wall    fan_outlet 
14    wall    fan_channel 
15    wall    fan_casing-outter 
16    wall    fan_casing-mrf 
17    wall   fan_casing-02 
18    wall   fan_rotor--mrf-layer-01  

19    wall    mrfDomain_frameboarder-interior 
20    wall    mrfDomain_frameboarder-interior_slave
based on the log.sHM the faces are on the wall (boundary). so i think i just need to use cellZone as for my MRFZone.

am i correct??
nash is offline   Reply With Quote
Sponsored Links

Old   April 30, 2015, 03:33
Senior Member
M. Montero
Join Date: Mar 2009
Location: Madrid
Posts: 124
Rep Power: 10
be_inspired is on a distinguished road
Any news about this topic?
I am trying to do the same and I have the doubts if it is needed to make a faceZone or not. My mesh has two regions. I have generated the cellZone with one of the regions that will be the one rotating. AMI patches will be non-rotating Patches but what about the wall-surface located inside the rotating region?
I am using OF2.3.x. Now in the fvOptions dict you have you select between cellZone selection and faceZone selection.... I think
be_inspired is offline   Reply With Quote

Old   April 30, 2015, 12:06
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 9,978
Blog Entries: 39
Rep Power: 108
wyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of light
Quick answer: Nash made a similar question here: - post 11 and in the posts after that I gave some answers.

And I know I wrote somewhere that faceZones aren't needed for MRF, but I can't find where I wrote it... anyway, faceZones are useful if you need to do additional calculations on the interface between the MRF and the remaining mesh, for example, for checking the mass flow going through it, pressure levels and so on.
wyldckat is offline   Reply With Quote


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
Export variables on faceZone VdG OpenFOAM Post-Processing 1 October 17, 2014 10:44
Reconstructing undecomposed faceZone in parallel cliffoi OpenFOAM Programming & Development 1 August 30, 2013 10:29
pimpleDyMFoam - more than one cellZone bephi OpenFOAM Running, Solving & CFD 1 May 23, 2013 08:44
Mass flow through faceZone using swak4foam when running in parallel billie OpenFOAM Post-Processing 22 May 14, 2013 07:20
How to compute cellZone volume vinz OpenFOAM Programming & Development 11 August 2, 2010 17:38

Sponsored Links

All times are GMT -4. The time now is 06:23.