Coordinates for SnappyHexMesh
 

Hello,

I am writting today beacause I have an issue when I import a .stl file in openFOAM.

I want to use a specific shape to modify a tank, the problem is, when I run snappyHexMesh, the system creates a .eMesh file thanks to the .stl file. This eMesh file is a conversion of the .stl file in order to import the shape at the good location in my tank.

When I want to see the Tank with paraFoam, the system crashed because some vertices are not longer coplanar. When I check the eMesh file, I can see that there is a small difference between this coordinates and the coordinates in the .stl file for the same vertex.

For istance, if my vertex is (100 1 -25) in the .stl file, this vertex in the eMesh file is (100 0.9999958456 -25). This difference makes paraFoam crashed and I do not know how to fix that problem...

Any idea?


Cheers,

Max

Hi maxime,

I am also a new user of snappyhexmesh but i will any way try to address your problem. Please forgive me if my answer is completely irrelevant to your question

I think snappyhexmesh does not create .eMesh file.. You need to use surfaceFeatureExtract option to create the .eMesh file. This has to be done before starting snappyexmesh option.

Cheers..
Ananth

Hi Ananth,

Thank you for your reply,

I run surfaceFeatureExtract before SnappyHexMesh. I have just fixed the problem, I increased the number of cells to define my beach using OpenScad to make a .stl file.

I had another problem, I posted a thread about it but I fixed it too by increasing the number of cells. It makes snappyHexMesh script a bit much longer to run but it works.

Regards,

Max

oh okie..

Good to hear that.. thanks for the information too.. It is very interesting how STL affects the meshing!!

cheers,
Ananth