Hello GMSH users,
I am quite new to GMSH and I am now using it for creating block
structured grids using transfinite meshes. I would like to achieve the
following behaviour:
1. generate a mesh of second order hexahedra from my geo file
2. refine the mesh by splitting each hexahedra into 8 elements and
creating new second order hexahedra out of it.
While I can achieve this behaviour in the GUI (refine by splitting + set
order 2),
I cannot figure out the proper command line options for doing this.
By
gmsh -3 -order 2 mesh.geo
I get the correct second order mesh. But I do not know how to refine it
now. Simply adding "-refine" option to the above, i.e.
gmsh -3 -order 2 -refine mesh.geo
does not work. If I try to refine the output of the previous command, i.e.
gmsh -refine mesh.msh
I get increased number of elements but with order reduced to 1, leading
to the same number of nodes.
Combining options to something like
gmsh -order 2 -refine mesh.msh
does not change this.
If I understand it well, my answer in fact boils down to the need of
"changing an existing mesh in MSH file from linear to quadratic elements
from the command line".
I am using GMSH v 2.5.1 .
I would appreciate any suggestions. Thanks in advance.
Best regards,
Jakub
--
Jakub Sistek, Ph.D.
postdoctoral researcher
Institute of Mathematics of the AS CR
http://www.math.cas.cz/~sistek/
tel: (+420) 222 090 710
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