[blockMesh] StartFace

PantaRhei · April 11, 2010, 12:38

Beginner question: when setting up the boundary condition file, how do you know what values to use for the start faces? I know the number of faces is based on the meshing you choose in the BlockMeshDict, but are you expected to know what order the geometry is meshed and the numbering indices? I have no idea what values to put for the startfaces.

PantaRhei · April 12, 2010, 01:31

So no one here knows how to solve this? How are you guys getting it done?

trautenberg · October 18, 2011, 03:52

I would very much like to know it too... Have you found out?

Bernhard · October 18, 2011, 04:18

In general you don't need to think about the numbering, since you can use the name of the boundary. Those are connected in polyMesh/boundary, which is created by blockMesh (or any of the convertors).

trautenberg · October 18, 2011, 04:51

thanks a lot! I was getting an error creating the mesh and I thought it was caused by this parameter

it works fine now and I know a bit more than before ;-) thanks!

curiosity · August 21, 2012, 07:35

Hi,

So that means I can leave it blank, isnt it? I mean, I have, e.g:

maxY
type wall
nFaces 300
startFace

If I write nothing on it, is blockMesh supposed to do it?

Thanks!

Bernhard · August 21, 2012, 07:55

The boundary file in the polyMesh directory is created by blockMesh.

curiosity · August 21, 2012, 08:34

Ok, easier then! Thanks!

aru.potter · August 8, 2015, 10:20

Does it hold good for nfaces too? That is, will the nfaces be automatically detected on typing blockMesh?

April 11, 2010, 12:38	StartFace	#1
PantaRhei New Member Denis Vasilescu Join Date: Apr 2010 Location: Chicago, U.S.A. Posts: 3 Rep Power: 16	Beginner question: when setting up the boundary condition file, how do you know what values to use for the start faces? I know the number of faces is based on the meshing you choose in the BlockMeshDict, but are you expected to know what order the geometry is meshed and the numbering indices? I have no idea what values to put for the startfaces. alireza.glz and ordinary like this.

April 12, 2010, 01:31		#2
PantaRhei New Member Denis Vasilescu Join Date: Apr 2010 Location: Chicago, U.S.A. Posts: 3 Rep Power: 16	So no one here knows how to solve this? How are you guys getting it done? ordinary likes this.

August 8, 2015, 10:20	nfaces	#9
aru.potter New Member N Aravind Kumar Join Date: Aug 2015 Posts: 3 Rep Power: 10	Does it hold good for nfaces too? That is, will the nfaces be automatically detected on typing blockMesh?

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October 18, 2011, 03:52		#3
trautenberg New Member Tomas Hofer Join Date: Oct 2011 Posts: 6 Rep Power: 14	I would very much like to know it too... Have you found out?

October 18, 2011, 04:18		#4
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	In general you don't need to think about the numbering, since you can use the name of the boundary. Those are connected in polyMesh/boundary, which is created by blockMesh (or any of the convertors).

October 18, 2011, 04:51		#5
trautenberg New Member Tomas Hofer Join Date: Oct 2011 Posts: 6 Rep Power: 14	thanks a lot! I was getting an error creating the mesh and I thought it was caused by this parameter it works fine now and I know a bit more than before ;-) thanks!

August 21, 2012, 07:35		#6
curiosity Member Paula Join Date: Aug 2012 Posts: 30 Rep Power: 13	Hi, So that means I can leave it blank, isnt it? I mean, I have, e.g: maxY type wall nFaces 300 startFace If I write nothing on it, is blockMesh supposed to do it? Thanks!

August 21, 2012, 07:55		#7
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	The boundary file in the polyMesh directory is created by blockMesh.

August 21, 2012, 08:34		#8
curiosity Member Paula Join Date: Aug 2012 Posts: 30 Rep Power: 13	Ok, easier then! Thanks!