SYNOPSIS
mkgeo_grid options [nx [ny [nz]]]
EXAMPLE
The following command build a triangular based 2d 10x10 grid of the unit square:
mkgeo_grid -t 10 > square-10.geo geo square-10.geoor in one comand line:
mkgeo_grid -t 10 | geo -
DESCRIPTION
This command is usefull when testing programs on simple geometries. It avoid the preparation of an input file for a mesh generator. The optional nx, ny and nz arguments are integer that specifies the subdivision in each direction. By default nx=10, ny=nx and nz=ny. The mesh files goes on standard output.
The command supports all the possible element types: edges, triangles, rectangles, tetraedra, prisms and hexahedra.
ELEMENT TYPE OPTIONS
- -e
- 1d mesh using edges.
- -t
- 2d mesh using triangles.
- -q
- 2d mesh using quadrangles (rectangles).
- -T
- 3d mesh using tetraedra.
- -P
- 3d mesh using prisms.
- -H
- 3d mesh using 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_grid -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_grid -t 10 > square.geo geo square.geo mkgeo_grid -t 10 -nosides > square.geo geo square.geo mkgeo_grid -t 10 -noboundary > square.geo geo square.geo mkgeo_grid -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_grid -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_grid -t 10 -corner | geo - mkgeo_grid -T 5 -corner | geo -
COORDINATE SYSTEM OPTION
Most of rheolef codes are coordinate-system independant. The coordinate system is specified in the geometry file `.geo'.
- -zr
- -rz
- the 2d mesh is axisymmetric: zr (resp. rz) stands when the symmetry is related to the first (resp. second) coordinate.
FILE FORMAT OPTION