2D C++ code for reading mesh (gmsh)

LUQILIN · August 27, 2016, 09:15

Hi Guys,
I want to write my own C++ code for 2D flow problems while I have difficulties for reading 2D mesh. I use the mesh generator called Gmsh.

Could anyone give me some advice? If there are for some open codes for beginners, that would be very helpful.

Thank You.

mprinkey · August 27, 2016, 17:10

The gmsh file format is easily available:

http://gmsh.info/doc/texinfo/gmsh.ht...II-file-format

OpenFVM using gmsh for its mesh input format and it is written in C. OpenFOAM has a gmsh input filter that is written in C++. You could refer to those.

Honestly though, the *hard* part here is sorting out how your are going to store face, cell, node, and edge data, both location and property data, but also connectivity and access structures. Those design decisions will drive the way you read the mesh file and populate the data structures. So, example code is not really going to be very helpful unless you are using the same data structures...and at that point, then why are you not just using the other code as a base.

Good luck.

LUQILIN · August 27, 2016, 20:07

Thank you very much.

August 27, 2016, 09:15	2D C++ code for reading mesh (gmsh)	#1
LUQILIN Member LUQILIN Join Date: May 2016 Location: Harbin, China Posts: 35 Rep Power: 9	Hi Guys, I want to write my own C++ code for 2D flow problems while I have difficulties for reading 2D mesh. I use the mesh generator called Gmsh. Could anyone give me some advice? If there are for some open codes for beginners, that would be very helpful. Thank You.

August 27, 2016, 17:10		#2
mprinkey Senior Member Michael Prinkey Join Date: Mar 2009 Location: Pittsburgh PA Posts: 363 Rep Power: 25	The gmsh file format is easily available: http://gmsh.info/doc/texinfo/gmsh.ht...II-file-format OpenFVM using gmsh for its mesh input format and it is written in C. OpenFOAM has a gmsh input filter that is written in C++. You could refer to those. Honestly though, the hard part here is sorting out how your are going to store face, cell, node, and edge data, both location and property data, but also connectivity and access structures. Those design decisions will drive the way you read the mesh file and populate the data structures. So, example code is not really going to be very helpful unless you are using the same data structures...and at that point, then why are you not just using the other code as a base. Good luck. arjun likes this.

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August 27, 2016, 20:07		#3
LUQILIN Member LUQILIN Join Date: May 2016 Location: Harbin, China Posts: 35 Rep Power: 9	Thank you very much.