Generating a proper STL mesh for snappyHexMesh

riccardomaione · August 24, 2015, 04:18

Hello all,

I am trying to generate a mesh with snappyHexMesh, in order to do that I drawed a STEP and from that an STL file with gmsh. the STL looks good in surfaceCheck, the problem is I don't know how to define boundaries on this STL file. I would also like to divide this STL to multiple pieces in order to have more freedom in the meshing phase. Anyone knows how to do it in a simple way?

thanks to all for the help
Riccardo

student666 · August 24, 2015, 15:37

Hi Riccardo,

have a look to these links:

https://www.youtube.com/watch?v=ObsFQUiVi1U
https://www.youtube.com/watch?v=1zQbU-E4k1U

they should help you a lot.

Anyway, someone uses to define groups of faces into Salome, export them into step files, to generate the 2D meshes then save them as stl (better quality). Remember that by this way, there's a sort of bug and before you can use them into OF you have to scale the stl by using surfaceTranformPoints open foam utility.

Code:

surfaceTransformPoints -scale '(0.001 0.001 0.001)' <surfaceFile> <output surfaceFile>

bye

riccardomaione · August 25, 2015, 02:17

Oh, that's perfect,

I will give it a shot, your help is much appreciated

thank you
Riccardo

August 24, 2015, 04:18	Generating a proper STL mesh for snappyHexMesh	#1
riccardomaione New Member riccardo maione Join Date: Jun 2014 Posts: 13 Rep Power: 11	Hello all, I am trying to generate a mesh with snappyHexMesh, in order to do that I drawed a STEP and from that an STL file with gmsh. the STL looks good in surfaceCheck, the problem is I don't know how to define boundaries on this STL file. I would also like to divide this STL to multiple pieces in order to have more freedom in the meshing phase. Anyone knows how to do it in a simple way? thanks to all for the help Riccardo

August 24, 2015, 15:37		#2
student666 Senior Member M. C. Join Date: May 2013 Location: Italy Posts: 286 Blog Entries: 6 Rep Power: 16	Hi Riccardo, have a look to these links: https://www.youtube.com/watch?v=ObsFQUiVi1U https://www.youtube.com/watch?v=1zQbU-E4k1U they should help you a lot. Anyway, someone uses to define groups of faces into Salome, export them into step files, to generate the 2D meshes then save them as stl (better quality). Remember that by this way, there's a sort of bug and before you can use them into OF you have to scale the stl by using surfaceTranformPoints open foam utility. Code: surfaceTransformPoints -scale '(0.001 0.001 0.001)' <surfaceFile> <output surfaceFile> bye

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August 25, 2015, 02:17		#3
riccardomaione New Member riccardo maione Join Date: Jun 2014 Posts: 13 Rep Power: 11	Oh, that's perfect, I will give it a shot, your help is much appreciated thank you Riccardo