[mesh manipulation] AutoRefineMesh utility

pbo · February 10, 2007, 16:43

Hi there,

was looking at the autoRefineMeshDict example located in ~/OpenFOAM/OpenFOAM-1.2/applications/utilities/mesh/advanced/autoRefineMesh.
As far as I understood, one could generate a body-fitted, Cartesian mesh by using this utility.
It seems that the surface to be embedded in the mesh is declared in the dictionary file as a file with a .ftr extension. Is that format compulsory to work with autoRefineMesh? if yes, how are the surface grid data organised in such a file?

Cheers

mattijs · February 12, 2007, 04:10

You can use any triSurface format. Use 'surfaceConvert' to convert formats.

pbo · February 13, 2007, 12:58

thanks for the hint Mattijs,

could you enlighten me about the outsidePoints entry?
It's not clear to me what should be in that list, should it be all the points of the orignal mesh that lie outside the surface to be embedded?

Also, can autoRefineMesh remove the inside cells automatically (i tried to play with nCutLayers but was not successful) or is it better to use insideCells and cellSet for that purpose?

Last question: Is there any utility around to project the cut cells on the triSurface?

thanks again,

pbo

mattijs · February 14, 2007, 03:20

outsidepoints: one or more points that determine the part of the mesh that will be kept. Any part of the mesh not connected to outsidepoints will be deleted (if nCutLayers>0)

You still want to specify the final set using selectCut/Inside/Outside.

pbo · February 19, 2007, 08:23

Mattijs,

In another thread, you were mentioning a utility called snapMesh:

Quote:

We haven't generated many meshes in house. Lots of blockMesh, some AC3D in combination with extrudeMesh (not trivial). There is some experimental undocumented hex-refinement stuff in meshing/advanced: autoRefineMesh, selectCells, snapMesh.

Cannot find it in meshing/advanced or anywhere else! Has it been removed from the OpenFOAM package?

pbo

mattijs · February 20, 2007, 17:08

snapMesh was never in a state to be released. You could try doing something yourself e.g. with triSurfaceSearch.nearest and mesh.movePoints.

msrinath80 · March 8, 2007, 15:10

Hi Mattijs,

A quick question. Will refineMesh refine 3D non-conformal meshes created using blockMesh?

Thanks!

mattijs · March 8, 2007, 15:18

As long as they're all hex. You might have a problem doing directed refinement though. Experiment is the advice.

msrinath80 · March 18, 2007, 02:08

Update: Doesn't work with non-conformal meshes even if they are generated through blockMesh. I'm doubling the interval count manually for now.

February 10, 2007, 16:43	AutoRefineMesh utility	#1
pbo Member Patrick Bourdin Join Date: Mar 2009 Posts: 40 Rep Power: 17	Hi there, was looking at the autoRefineMeshDict example located in ~/OpenFOAM/OpenFOAM-1.2/applications/utilities/mesh/advanced/autoRefineMesh. As far as I understood, one could generate a body-fitted, Cartesian mesh by using this utility. It seems that the surface to be embedded in the mesh is declared in the dictionary file as a file with a .ftr extension. Is that format compulsory to work with autoRefineMesh? if yes, how are the surface grid data organised in such a file? Cheers

February 12, 2007, 04:10	You can use any triSurface for	#2
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	You can use any triSurface format. Use 'surfaceConvert' to convert formats.

February 13, 2007, 12:58	thanks for the hint Mattijs,	#3
pbo Member Patrick Bourdin Join Date: Mar 2009 Posts: 40 Rep Power: 17	thanks for the hint Mattijs, could you enlighten me about the outsidePoints entry? It's not clear to me what should be in that list, should it be all the points of the orignal mesh that lie outside the surface to be embedded? Also, can autoRefineMesh remove the inside cells automatically (i tried to play with nCutLayers but was not successful) or is it better to use insideCells and cellSet for that purpose? Last question: Is there any utility around to project the cut cells on the triSurface? thanks again, pbo

February 14, 2007, 03:20	outsidepoints: one or more poi	#4
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	outsidepoints: one or more points that determine the part of the mesh that will be kept. Any part of the mesh not connected to outsidepoints will be deleted (if nCutLayers>0) You still want to specify the final set using selectCut/Inside/Outside.

February 20, 2007, 17:08	snapMesh was never in a state	#6
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	snapMesh was never in a state to be released. You could try doing something yourself e.g. with triSurfaceSearch.nearest and mesh.movePoints.

March 8, 2007, 15:10	Hi Mattijs, A quick questio	#7
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	Hi Mattijs, A quick question. Will refineMesh refine 3D non-conformal meshes created using blockMesh? Thanks!

March 8, 2007, 15:18	As long as they're all hex. Yo	#8
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	As long as they're all hex. You might have a problem doing directed refinement though. Experiment is the advice.

March 18, 2007, 02:08	Update: Doesn't work with non-	#9
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	Update: Doesn't work with non-conformal meshes even if they are generated through blockMesh. I'm doubling the interval count manually for now.

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