How to tetrahedron from a triangular mesh?

zhang-qiang · January 16, 2023, 03:46

For example, I have a triangular mesh for 3D volume object. In order to generate `SU2` file, I need to firstly generate triangular mesh.

Is there any powerful python package to generate tetrahedron from a triangular mesh? Any suggestion is appreciated~~~

bigfootedrockmidget · January 16, 2023, 06:46

I suggest you try to do everything in gmsh using structured meshes.

The best thing imo that you could do is to build the 3D model from scratch from your own geometry definition. If you have some kind of irregular geometric shape already, then convert the edges of the shape to a collection of lines and load that in gmsh.If you have the mathematical definition of the shape, then use that to define the edges. For instance, you can define a circular face in gmsh and then extrude that face according to some user defined expression. See for instance the gmsh .geo file of this tutorial:
https://su2code.github.io/tutorials/...pendent_Model/

or this gmsh video: https://www.youtube.com/watch?v=VokUbWUhU-c

and the gmsh manual, specifically 2.19
https://gmsh.info/doc/texinfo/gmsh.html

I hope this helps.

zhang-qiang · January 16, 2023, 23:10

Many thanks. I will try gmsh~~~

January 16, 2023, 03:46	How to tetrahedron from a triangular mesh?	#1
zhang-qiang Member zhangqiang Join Date: Nov 2022 Posts: 43 Rep Power: 4	For example, I have a triangular mesh for 3D volume object. In order to generate `SU2` file, I need to firstly generate triangular mesh. Is there any powerful python package to generate tetrahedron from a triangular mesh? Any suggestion is appreciated~~~

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January 16, 2023, 06:46		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 679 Rep Power: 21	I suggest you try to do everything in gmsh using structured meshes. The best thing imo that you could do is to build the 3D model from scratch from your own geometry definition. If you have some kind of irregular geometric shape already, then convert the edges of the shape to a collection of lines and load that in gmsh.If you have the mathematical definition of the shape, then use that to define the edges. For instance, you can define a circular face in gmsh and then extrude that face according to some user defined expression. See for instance the gmsh .geo file of this tutorial: https://su2code.github.io/tutorials/...pendent_Model/ or this gmsh video: https://www.youtube.com/watch?v=VokUbWUhU-c and the gmsh manual, specifically 2.19 https://gmsh.info/doc/texinfo/gmsh.html I hope this helps.

January 16, 2023, 23:10		#3
zhang-qiang Member zhangqiang Join Date: Nov 2022 Posts: 43 Rep Power: 4	Many thanks. I will try gmsh~~~