Provided by: rheolef_6.5-1build1_amd64
NAME
mkgeo_ugrid -- build an unstructured mesh of a parallelotope, in 1d, 2d or 3d
SYNOPSIS
mkgeo_ugrid options [n]
EXAMPLE
The following command build a triangle based 2d unstructured mesh of the unit square: mkgeo_ugrid -t 10 > square-10.geo geo -mayavi square-10.geo or in one comand line: mkgeo_ugrid -t 10 | geo -mayavi -
DESCRIPTION
This command is usefull when testing programs on simple geometries. Invocation is similar to mkgeo_grid (see mkgeo_grid(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. The command supports all the possible element types: edges, triangles, rectangles, tetraedra, prisms and hexahedra. It supports also mixed 2D with triangles and quadrangles: mkgeo_ugrid -tq 10 | geo -mayavi - and mixed 3D with tetraedra, prisms and/or hjexaedra: mkgeo_ugrid -TP 10 | geo -mayavi - mkgeo_ugrid -PH 10 | geo -mayavi - mkgeo_ugrid -TPH 10 | geo -mayavi -
ELEMENT TYPE OPTIONS
-e 1d mesh using edges. -t 2d mesh using triangles. -q 2d mesh using quadrangles. -tq 2d mesh using both triangles and quadrangles. -T 3d mesh using tetraedra. -P 3d mesh using prisms. -H 3d mesh using hexahedra. -TP -PH -TPH 3d mesh using a mixt between tetraedra, prisms and/or hexahedra.
THE GEOMETRY
The geometry can be any [a,b] segment, [a,b]x[c,d] rectangle or [a,b]x[c,d]x[f,g] parallelotope. By default a=c=f=0 and b=d=g=1, thus, the unit boxes are considered. For instance, the following command meshes the [-2,2]x[-1.5, 1.5] rectangle: mkgeo_ugrid -t 10 -a -2 -b 2 -c -1.5 -d 1.5 | geo - -a float -b float -c float -d float -f float -g float
BOUNDARY DOMAINS
-sides -nosides The boundary sides are representd by domains: left, right, top, bottom,front and back. -boundary -noboundary This option defines a domain named boundary that groups all sides. By default, both sides and the whole boundary are defined as domains: mkgeo_ugrid -t 10 > square.geo geo square.geo mkgeo_ugrid -t 10 -nosides > square.geo geo square.geo mkgeo_ugrid -t 10 -noboundary > square.geo geo square.geo mkgeo_ugrid -t 10 -noboundary -nosides > square.geo geo square.geo
REGIONS
-region -noregion The whole domain is splitted into two subdomains: east and west, This option is used for testing computations with subdomains (e.g. transmission problem; see the user manual). mkgeo_ugrid -t 10 -region | geo -
CORNERS
-corner -nocorner The corners (four in 2D and eight in 3D) are defined as OD-domains. This could be usefull for some special boundary conditions. mkgeo_ugrid -t 10 -corner | geo - mkgeo_ugrid -T 5 -corner | geo -
THE MESH ORDER
-order int The polynomial approximation mesh order, as defined by gmsh. This option enable a possible curved boundary, when applying a suitable nonlinear transformation to the mesh. Defualt is order=1.
OTHERS OPTIONS
-clean clear temporary files (this is the default). -noclean does not clear temporary files.
SEE ALSO
mkgeo_grid(1)