CFD Online Discussion Forums

CFD Online Discussion Forums (
-   OpenFOAM Mesh Utilities (
-   -   SnappyHexMesh featureEdgeMesh (

braennstroem July 16, 2008 09:00

Hi, I am testing the new me

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.


bastil July 16, 2008 10:17

Fabian, what do you need "f

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?


braennstroem July 16, 2008 10:53

The attache picture is actuall
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.

bastil July 16, 2008 11:39

As said before AFAIK feature l
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....


mattijs July 16, 2008 17:16

The mesher does not do feature
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 wrappi
So it is more a kind of wrapping approach!?

olesen July 17, 2008 02:24

I think Andrew said in his tal
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 workin
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 mis
O.k., I was a bit late and missed the presentation.

andersking August 26, 2008 00:09

Hi, Any idea when feature

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.


podallaire October 5, 2008 21:48

Hi, I'm interested as well

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,


podallaire February 10, 2009 09:59

Good morning, any update re
Good morning,

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

Best regards,


santos February 11, 2009 05:55

Hello Pierre, For now I gav
Hello Pierre,

For now I gave up on snappyHexMesh for geometries with circular edges, and I am using enGrid with some excellent results ( Version 1.0 is out, with native OpenFOAM export capability. Give it a try!

Jose Santos

wolle1982 February 23, 2009 14:19

Turn down your mesh quality wi
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

snappyHexMesh - feature lines in version 1.6?
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.


openfoam_user September 28, 2009 05:48

any news about the edge/feature of snappyHexMesh ?

thanks !


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.


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,


bastil September 30, 2009 02:56

Well all I know is from there:

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


Hanno March 1, 2011 07:03


Originally Posted by bastil (Post 178011)
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?

All times are GMT -4. The time now is 08:40.