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