NAME

       mkgeo_grid - structured mesh of a parallelepiped (rheolef-7.1)

SYNOPSIS

       mkgeo_grid [options] [nx [ny [nz]]]

EXAMPLES

       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 command line:

           mkgeo_grid -t 10 | geo -

DESCRIPTION

       This command is useful 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,
       tetrahedra, prisms and hexahedra.

ELEMENT TYPE OPTION

       -e

           1d mesh using edges.

       -t

           2d mesh using triangles.

       -q

           2d mesh using quadrangles (rectangles).

       -T

           3d mesh using tetrahedra.

       -P

           3d mesh using prisms.

       -H

           3d mesh using hexahedra.

THE GEOMETRY

       -a float
       -b float
       -c float
       -d float
       -f float
       -g float

           The geometry can be any [a,b] segment, [a,b]x[c,d] rectangle or [a,b]x[c,d]x[f,g]
           parallelepiped. 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 -

BOUNDARY DOMAINS

       -[no]sides

           The boundary sides are represented by domains: left, right, top, bottom, front and
           back.

       -[no]boundary

           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 -nosides | geo -
           mkgeo_grid -t 10 -noboundary | geo -
           mkgeo_grid -t 10 -noboundary -nosides | geo -

REGIONS

       -[no]region

           The whole domain is split into two subdomains: east and west. Also, the separating
           domain is named interface in the mesh. This option is used for testing computations
           with subdomains (e.g. transmission problem; see usersguide ).

       Example:

           mkgeo_grid -t 10 -region | geo -

CORNERS

       -[no]corner

           The corners (four in 2D and eight in 3D) are defined as OD-domains. This could be
           useful for some special boundary conditions.

       Example:

           mkgeo_grid -t 10 -corner | geo -
           mkgeo_grid -T  5 -corner | geo -

COORDINATE SYSTEM OPTIONS

       -cartesian
       -rz
       -zr

           Specifies the coordinate system. The default is cartesian while -rz and -zr denotes
           some axisymmetric coordinate systems. Recall that most of Rheolef codes are
           coordinate-system independent and the coordinate system is specified in the geometry
           file .geo.

IMPLEMENTATION

       This documentation has been generated from file main/sbin/mkgeo_grid.sh

AUTHOR

       Pierre  Saramito  <Pierre.Saramito@imag.fr>

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.