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faceZone or cellZone for MRF

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Old   August 15, 2013, 03:22
Default faceZone or cellZone for MRF
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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??
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Old   April 30, 2015, 03:33
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M. Montero
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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
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Old   April 30, 2015, 12:06
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Bruno Santos
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wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
Quick answer: Nash made a similar question here: dynamic Mesh is faster than MRF???? - 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.
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