NAME¶
mkgeo_ball -- build an unstructured mesh of an ellipsoid, in 2d or 3d
SYNOPSIS¶
mkgeo_ball options [n]
EXAMPLE¶
The following command build a triangle based 2d unstructured mesh of the unit
ball
mkgeo_ball -t 10 > ball-10.geo
geo -mayavi ball-10.geo
or in one command line:
mkgeo_ball -t 10 | geo -mayavi -
DESCRIPTION¶
This command is useful when testing programs on simple geometries. Invocation is
similar to mkgeo_grid (see mkgeo_grid(1), mkgeo_ugrid(1)). It calls
gmsh as unstructured mesh generator. It avoid the preparation of an
input file for a mesh generator. The optional n argument is an integer
that specifies the subdivision in each direction. By default n=10. The
mesh files goes on standard output.
ELEMENT TYPE OPTIONS¶
- -t
- 2d mesh using triangles.
- -q
- 2d mesh using quadrangles.
- -tq
- 2d mesh using both triangles and quadrangles.
THE MESH ORDER¶
- -order int
- The polynomial pproximation mesh order, for the curved boundary, as
defined by gmsh. Default is order=1.
THE GEOMETRY¶
The geometry can be ellipse/ellipsoid inscribted in the [a,b]x[c,d] rectangle or
the [a,b]x[c,d]x[f,g] parallelotope. By default a=c=f=-1 and b=d=g=1, thus,
the unit balls are considered.
- -s
- Only a surface mesh is generated: a curved line in 2d or a curved surface
mesh in 3d. In 3d, supports both '-t' and '-q' options.
- -a float
- -b float
- -c float
- -d float
- -f float
- -g float
BOUNDARY DOMAINS¶
The meshes defines a domain named boundary that groups all boundary
sides.
OTHERS OPTIONS¶
- -fix
- -nofix
- By default, internal face and volume node from gmsh are recomputed, since
they have incorrect coordinate that destroy the convergence properties of
isoparametric high order elements (order >= 3). The -nofix
option skip this correction: this option is available for test
purpose.
- -clean
- clear temporary files (this is the default).
- -noclean
- does not clear temporary files.
- -verbose
- -noverbose
- print intermediate commands and information messages.
COPYRIGHT¶
Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@imag.fr> GPLv3+:
GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is
free software: you are free to change and redistribute it. There is NO
WARRANTY, to the extent permitted by law.
