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-   -   [gmsh STL] (https://www.cfd-online.com/Forums/openfoam-meshing-open/111704-gmsh-stl.html)

huitetquatre January 13, 2013 12:43

[gmsh STL]
 
Hi,

I want to generate a mesh around an object using gmsh. This object is defined using a STL file.
My current geo file is organised as follow:
1/ importing the STL object;
2/ creating the bounding box around the object;
3/ physical surface definition.

I've got different problems:
- I don"t know how to link the surface of the object with the different surfaces of the box. Consequently, the generated mesh with gmsh is not taking into account the STL object.
- How can determine the physical entities (surface and volume) ?

The geo file is the following one:
// --------------------------------------------------
// STL Object
// --------------------------------------------------
// merge a surface mesh
Merge "cone.stl";

// add a geometrical volume
Surface Loop(1) = {1};
Volume(1) = {1};

// --------------------------------------------------
// Bounding Box
// --------------------------------------------------
l = 1;

xmin = -10;
xmax = 10;
ymin = -10;
ymax = 10;
zmin = -10;
zmax = 10;

Point(1000) = {xmin, ymin, zmin, l};
Point(1001) = {xmin, ymin, zmax, l};
Point(1010) = {xmin, ymax, zmin, l};
Point(1011) = {xmin, ymax, zmax, l};

Line(2001) = {1000, 1001};
Line(2002) = {1001, 1011};
Line(2003) = {1011, 1010};
Line(2004) = {1010, 1000};

Line Loop (2005) = {2001, 2002, 2003, 2004};
Plane Surface(10006) = {2005};
box[] = Extrude {(xmax-xmin), 0, 0}{
Surface{10006};
// Layers{1};
};
Delete { Volume{box[1]}; }

// TODO
// Volume(4000) = {?};

// --------------------------------------------------
// Physics
// --------------------------------------------------
// Physical Surface("back") = {?};
// Physical Surface("front") = {?};
// Physical Surface("top") = {?};
// Physical Surface("bottom") = {?};
// Physical Surface("left") = {?};
// Physical Surface("right") = {?};
// Physical Surface("object") = {?};
// Physical Volume("internal") = {?};

huitetquatre January 16, 2013 09:46

Problem solved.

Abracurcix December 5, 2013 02:07

Hello David,
Could you please share with us as to how you solved this problem?

Thanks,
Albert

Abracurcix December 13, 2013 01:56

Anyone else has any suggestions regarding generating meshes around STL objects with GMSH? Any examples would be helpful. Please?

Albert

Quote:

Originally Posted by Abracurcix (Post 464921)
Hello David,
Could you please share with us as to how you solved this problem?

Thanks,
Albert



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