NAME

       mkgeo_grid -- build a strutured mesh of a parallelotope, in 1d, 2d or 3d

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.geo

       or 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