Gmsh, extrude a 2D mesh with grading

mb.pejvak · February 21, 2020, 05:50

I want to know if it is possible to extrude 2D mesh in Gmsh and have grading in the direction of extrusion. for example, in the command, it generate 12 layer in len of z direction with equal interval. I want to know that if it is possible to have grading in z direction

Code:

Extrude {0, 0, z_len} { Surface{1}; Layers{12}; Recombine;}

mb.pejvak · February 22, 2020, 10:02

For the users who may need the solution

HTML Code:

https://www.cfd-online.com/Forums/openfoam-meshing/179247-using-bump-extrude-layers-gmsh.html

mb.pejvak · February 28, 2020, 04:25

The method mentioned above can not generate 3D mesh, to solve the problem asked in the question, it should be done by manipulation Layer attribute in extrude command in this way

Code:

Extrude {0, 0, z_len} { Surface{1}; Layers{{6,3,2},{0.2,0.5,1}}; Recombine;}

which means that the 20% of the length of extrusion divided into 6 subdivisions, between 20% and 50% into 3 subdivision, and the rest into 2.

February 21, 2020, 05:50	Gmsh, extrude a 2D mesh with grading	#1
mb.pejvak Senior Member Mehdi Babamehdi Join Date: Jan 2011 Posts: 158 Rep Power: 15	I want to know if it is possible to extrude 2D mesh in Gmsh and have grading in the direction of extrusion. for example, in the command, it generate 12 layer in len of z direction with equal interval. I want to know that if it is possible to have grading in z direction Code: Extrude {0, 0, z_len} { Surface{1}; Layers{12}; Recombine;} Last edited by mb.pejvak; February 21, 2020 at 08:24.

February 22, 2020, 10:02		#2
mb.pejvak Senior Member Mehdi Babamehdi Join Date: Jan 2011 Posts: 158 Rep Power: 15	For the users who may need the solution HTML Code: https://www.cfd-online.com/Forums/openfoam-meshing/179247-using-bump-extrude-layers-gmsh.html Last edited by mb.pejvak; February 22, 2020 at 11:49.

February 28, 2020, 04:25		#3
mb.pejvak Senior Member Mehdi Babamehdi Join Date: Jan 2011 Posts: 158 Rep Power: 15	The method mentioned above can not generate 3D mesh, to solve the problem asked in the question, it should be done by manipulation Layer attribute in extrude command in this way Code: Extrude {0, 0, z_len} { Surface{1}; Layers{{6,3,2},{0.2,0.5,1}}; Recombine;} which means that the 20% of the length of extrusion divided into 6 subdivisions, between 20% and 50% into 3 subdivision, and the rest into 2.

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