SnappyHexMesh featureEdgeMesh

braennstroem · July 16, 2008, 09:00

Hi,

I am testing the new meshing tool. Does anyone have an idea how to create the needed 'features'? I could not find any tool to write this featureEdgeMesh.

Thanks!
Fabian

bastil · July 16, 2008, 10:17

Fabian,

what do you need "features" for? The process runs without. Afaik this is only for feature line prevention which is not yet implemented.
Do you know about requirements of the stl import surface? Does is have to be closed an manifold?

Regards

braennstroem · July 16, 2008, 10:53

The attache picture is actually a rectangular cubic room with a round inlet. As one can see, there is a need of 'features' in some way.

Maybe, I missed some other setting (resolveFeatureAngle is set to 30)!?

According the stl surface; I have no idea.
Fabian

bastil · July 16, 2008, 11:39

As said before AFAIK feature lines are not yet implemented. Maybe the file "someLine.eMesh"; // file containing edge mesh" corresponds to this not yet implemented feature. So if the mesh has the maximum allowed refinemient (minium possible cell size) which it seems to have looking at the picture I guess there is nothing more you can do at the moment....

Reguards

mattijs · July 16, 2008, 17:16

The mesher does not do feature lines - neither geometric features nor topological features (e.g. patch boundaries).

The someline.eMesh is a file containing points and edges where you want additional refinement. See featureEdgeMesh class in edgeMesh library.

braennstroem · July 17, 2008, 01:54

So it is more a kind of wrapping approach!?

olesen · July 17, 2008, 02:24

I think Andrew said in his talk that the edges between different patch regions will be preserved.

eugene · July 17, 2008, 08:33

One of my colleagues is working on geometric feature line capturing at the moment and our current status was presented in Milan. As Mattijs mentioned, this functionality is not present in the 1.5 version of snappyHexMesh.

You can use any kind of triangulated surface. It doesn't have to be cleaned or closed or manifold, although you will mesh both sides if it isn't closed and the holes are large or large in number.

braennstroem · July 17, 2008, 14:21

O.k., I was a bit late and missed the presentation.

andersking · August 26, 2008, 00:09

Hi,

Any idea when feature line capturing will be available? (rough time line) - I couldn't attend the Milan workshop unfortunately (other side of the world). Or alternatively, any workarounds to fix the edges after meshing?

In one of my models I am having problems with non-flat and jagged patch edges causing flow instabilities.

Cheers,
Andrew

podallaire · October 5, 2008, 21:48

Hi,

I'm interested as well to see when the feature will be implemented - snappy does an excellent job but I still have some problems with circle edges.

Best regards,

PO

podallaire · February 10, 2009, 08:59

Good morning,

any update regarding this matter / does somebody was able to
improve this behavior ?

Best regards,

PO

santos · February 11, 2009, 04:55

Hello Pierre,

For now I gave up on snappyHexMesh for geometries with circular edges, and I am using enGrid with some excellent results (http://217.6.151.88/cms/index.php?id=4). Version 1.0 is out, with native OpenFOAM export capability. Give it a try!

Regards,
Jose Santos

wolle1982 · February 23, 2009, 13:19

Turn down your mesh quality wishes. If not possible to reach wanted mesh quality, it fails to find correspondence to geometry. Maybe this helps a little.

brent_craven · September 25, 2009, 00:13

Hi All,
Does anyone know if feature lines have yet been implemented in snappyHexMesh/OpenFOAM 1.6?

From my experience this and more robust near-wall layer addition are the only weakness/limitations of snappyHexMesh, which is otherwise a great utility.

Thanks!
Brent

openfoam_user · September 28, 2009, 05:48

any news about the edge/feature of snappyHexMesh ?

thanks !

Stephane
OpenFOAM-1.6.x

bastil · September 29, 2009, 02:54

I do not think this has made its way into 1.6.x. However there seems to be some self-made solutions hanging around somewhere. I guess they are not yet publicly available.

Regards

openfoam_user · September 29, 2009, 03:01

Dear Bastil,

Could you please give me some hints about these self-made solutions ?

How and where can I find these solutions (publicly available) ?

Best Regards,

Stephane.

bastil · September 30, 2009, 02:56

Well all I know is from there:

http://www.opensourcecfd.com/confere...iersEugene.pdf

Maybe Eugene can provide us with some more information since I am also very interested in this.

Regards.

Hanno · March 1, 2011, 06:03

Quote:

Originally Posted by bastil

As said before AFAIK feature lines are not yet implemented. Maybe ...

A lot of water flew down the river until yet.
Can anyone tell me if feature lines are now implemented?
Thanks.

July 16, 2008, 09:00	Hi, I am testing the new me	#1
braennstroem Senior Member Fabian Braennstroem Join Date: Mar 2009 Posts: 407 Rep Power: 8	Hi, I am testing the new meshing tool. Does anyone have an idea how to create the needed 'features'? I could not find any tool to write this featureEdgeMesh. Thanks! Fabian

July 16, 2008, 10:17	Fabian, what do you need "f	#2
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 462 Rep Power: 9	Fabian, what do you need "features" for? The process runs without. Afaik this is only for feature line prevention which is not yet implemented. Do you know about requirements of the stl import surface? Does is have to be closed an manifold? Regards

July 16, 2008, 10:53	The attache picture is actuall	#3
braennstroem Senior Member Fabian Braennstroem Join Date: Mar 2009 Posts: 407 Rep Power: 8	The attache picture is actually a rectangular cubic room with a round inlet. As one can see, there is a need of 'features' in some way. Maybe, I missed some other setting (resolveFeatureAngle is set to 30)!? According the stl surface; I have no idea. Fabian

July 16, 2008, 11:39	As said before AFAIK feature l	#4
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 462 Rep Power: 9	As said before AFAIK feature lines are not yet implemented. Maybe the file "someLine.eMesh"; // file containing edge mesh" corresponds to this not yet implemented feature. So if the mesh has the maximum allowed refinemient (minium possible cell size) which it seems to have looking at the picture I guess there is nothing more you can do at the moment.... Reguards

July 16, 2008, 17:16	The mesher does not do feature	#5
mattijs Super Moderator Mattijs Janssens Join Date: Mar 2009 Posts: 1,416 Rep Power: 13	The mesher does not do feature lines - neither geometric features nor topological features (e.g. patch boundaries). The someline.eMesh is a file containing points and edges where you want additional refinement. See featureEdgeMesh class in edgeMesh library.

July 17, 2008, 01:54	So it is more a kind of wrappi	#6
braennstroem Senior Member Fabian Braennstroem Join Date: Mar 2009 Posts: 407 Rep Power: 8	So it is more a kind of wrapping approach!?

July 17, 2008, 02:24	I think Andrew said in his tal	#7
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: http://olesenm.github.com/ Posts: 766 Rep Power: 16	I think Andrew said in his talk that the edges between different patch regions will be preserved.

July 17, 2008, 08:33	One of my colleagues is workin	#8
eugene Senior Member Eugene de Villiers Join Date: Mar 2009 Posts: 723 Rep Power: 10	One of my colleagues is working on geometric feature line capturing at the moment and our current status was presented in Milan. As Mattijs mentioned, this functionality is not present in the 1.5 version of snappyHexMesh. You can use any kind of triangulated surface. It doesn't have to be cleaned or closed or manifold, although you will mesh both sides if it isn't closed and the holes are large or large in number.

July 17, 2008, 14:21	O.k., I was a bit late and mis	#9
braennstroem Senior Member Fabian Braennstroem Join Date: Mar 2009 Posts: 407 Rep Power: 8	O.k., I was a bit late and missed the presentation.

August 26, 2008, 00:09	Hi, Any idea when feature	#10
andersking Member Andrew King Join Date: Mar 2009 Location: Perth, Western Australia, Australia Posts: 81 Rep Power: 6	Hi, Any idea when feature line capturing will be available? (rough time line) - I couldn't attend the Milan workshop unfortunately (other side of the world). Or alternatively, any workarounds to fix the edges after meshing? In one of my models I am having problems with non-flat and jagged patch edges causing flow instabilities. Cheers, Andrew __________________ Dr Andrew King Fluid Dynamics Research Group Curtin University

October 5, 2008, 21:48	Hi, I'm interested as well	#11
podallaire Senior Member Pierre-Olivier Dallaire Join Date: Mar 2009 Location: Montreal, Quebec, Canada Posts: 178 Rep Power: 6	Hi, I'm interested as well to see when the feature will be implemented - snappy does an excellent job but I still have some problems with circle edges. Best regards, PO

February 10, 2009, 08:59	Good morning, any update re	#12
podallaire Senior Member Pierre-Olivier Dallaire Join Date: Mar 2009 Location: Montreal, Quebec, Canada Posts: 178 Rep Power: 6	Good morning, any update regarding this matter / does somebody was able to improve this behavior ? Best regards, PO

February 11, 2009, 04:55	Hello Pierre, For now I gav	#13
santos Senior Member Jose Luis Santos Join Date: Mar 2009 Location: Portugal Posts: 211 Rep Power: 7	Hello Pierre, For now I gave up on snappyHexMesh for geometries with circular edges, and I am using enGrid with some excellent results (http://217.6.151.88/cms/index.php?id=4). Version 1.0 is out, with native OpenFOAM export capability. Give it a try! Regards, Jose Santos

February 23, 2009, 13:19	Turn down your mesh quality wi	#14
wolle1982 Senior Member Wolfgang Heydlauff Join Date: Mar 2009 Location: Germany Posts: 136 Rep Power: 6	Turn down your mesh quality wishes. If not possible to reach wanted mesh quality, it fails to find correspondence to geometry. Maybe this helps a little.

September 25, 2009, 00:13	snappyHexMesh - feature lines in version 1.6?	#15
brent_craven New Member Brent Craven Join Date: Mar 2009 Location: University Park, PA, USA Posts: 21 Rep Power: 6	Hi All, Does anyone know if feature lines have yet been implemented in snappyHexMesh/OpenFOAM 1.6? From my experience this and more robust near-wall layer addition are the only weakness/limitations of snappyHexMesh, which is otherwise a great utility. Thanks! Brent

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September 28, 2009, 05:48		#16
openfoam_user Senior Member stephane sanchi Join Date: Mar 2009 Posts: 287 Rep Power: 7	any news about the edge/feature of snappyHexMesh ? thanks ! Stephane OpenFOAM-1.6.x

September 29, 2009, 02:54		#17
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 462 Rep Power: 9	I do not think this has made its way into 1.6.x. However there seems to be some self-made solutions hanging around somewhere. I guess they are not yet publicly available. Regards

September 29, 2009, 03:01		#18
openfoam_user Senior Member stephane sanchi Join Date: Mar 2009 Posts: 287 Rep Power: 7	Dear Bastil, Could you please give me some hints about these self-made solutions ? How and where can I find these solutions (publicly available) ? Best Regards, Stephane.

September 30, 2009, 02:56		#19
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 462 Rep Power: 9	Well all I know is from there: http://www.opensourcecfd.com/confere...iersEugene.pdf Maybe Eugene can provide us with some more information since I am also very interested in this. Regards.

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