Hi, Is there a way to get sn
 

Hi,
Is there a way to get snappyHexMesh to follow sharp edges? I have meshed a geometry however patch boundaries become irregular, which is causing problems in the solution. The attached image hopefully makes it clearer.

http://www.cfd-online.com/OpenFOAM_D...ges/1/8845.jpg

I would like to get this to work, otherwise I'll have to go back to another mesher.

Cheers,
Andrew

Just a little question: are th
 

Just a little question: are there advantages to snap hex to mesh instead of creating polygons which would better fit the immersed object ?

Actually, I should explain my
 

Actually, I should explain my diagram a bit better. The red and blue patches actually do line up (I moved one so that the join can be seen) the problem are the non flat faces in the red patch.

To answer your question - I use snappyHexMesh as it generally gives a very well behaved mesh, and is (very) easy to set up for complex geometries (stl surfaces).

Prior to this I have generally used netget/gmsh. I have tried to use polyDualMesh to convert these to polyhedral meshes, but without much success. I have downloaded engrid and am going to give it a try instead.

Cheers,
Andrew

As far as I know, snappyHexMes
 

As far as I know, snappyHexMesh has no automatic feature line capturing, unfortunately. You can somehow explicitly provide some feature edge through a file separated from the STL, but I haven't tried it and don't know how well it works.

Cheers,
Francesco

Thanks Francesco. I managed
 

Thanks Francesco.

I managed to find this thread after another search http://www.cfd-online.com/cgi-bin/Op...c=1&post=24651 - It appears that edge matching won't be a part of snappyHex Mesh for quite a while. It's a pity as apart from this I am impressed with the meshes snappyHexMesh creates. Looks like I'll have to go back to netgen for now.

Cheers,
Andrew

Is there anyone have any hope that edge capturing will be a possibility with snappy. I think that a must for many peoples..

snapEdge may be what you are looking for
 

snapEdge may be what you are looking for

see

http://openfoamwiki.net/index.php/Contrib_snapEdge

edges of 3D wing
 

Hi,

I'm encountering the same problem as andersking. Using snappyHexMesh, don't get the edges of my NACA0012 straight. Any suggestions for improvement?

Cheers,
Horsty
Attachment 19610

Hi Horsty,

Try looking at the flange example (http://www.openfoam.com/news/snappyH...ature-edge.php)

While I have not tried it for an aerofoil a similar approach involving the use of:
surfaceFeatureExtract
(as per the flange example) should hopefully help.

The flange example should be in tutorials/mesh/snappyHexMesh/flange

Cheers,

Paul

surfaceFeatureExtract
 

Well, that pretty much did the job.

Thanks a lot mate!

Attachment 19634