.TH "mkgeo_grid" 1rheolef "Version 7.2" "rheolef" \" -*- nroff -*-
.ad l
.nh
.SH NAME
mkgeo_grid \- structured mesh of a parallelepiped (rheolef-7\&.2)
.PP
   
.SH "SYNOPSIS"
.PP
.nf
mkgeo_grid [options] [nx [ny [nz]]]
.fi
.PP
 
.SH "EXAMPLES"
The following command build a triangular based 2d 10x10 grid of the unit square: 
.PP
.nf
    mkgeo_grid -t 10 > square-10\&.geo
    geo square-10\&.geo

.fi
.PP
 or in one command line: 
.PP
.nf
    mkgeo_grid -t 10 | geo -

.fi
.PP
 
.SH "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\&.
.PP
The command supports all the possible element types: edges, triangles, rectangles, tetrahedra, prisms and hexahedra\&.
.SH "ELEMENT TYPE OPTION"
\fC-e\fP 
.PP
.RS 4
 1d mesh using edges\&. 
.RE
.PP
\fC-t\fP 
.PP
.RS 4
 2d mesh using triangles\&. 
.RE
.PP
\fC-q\fP 
.PP
.RS 4
 2d mesh using quadrangles (rectangles)\&. 
.RE
.PP
\fC-T\fP 
.PP
.RS 4
 3d mesh using tetrahedra\&. 
.RE
.PP
\fC-P\fP 
.PP
.RS 4
 3d mesh using prisms\&. 
.RE
.PP
\fC-H\fP 
.PP
.RS 4
 3d mesh using hexahedra\&. 
.RE
.PP
.SH "THE GEOMETRY"
\fC-a\fP \fIfloat\fP 
.br
\fC-b\fP \fIfloat\fP 
.br
\fC-c\fP \fIfloat\fP 
.br
\fC-d\fP \fIfloat\fP 
.br
\fC-f\fP \fIfloat\fP 
.br
\fC-g\fP \fIfloat\fP 
.PP
.RS 4
 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\&. 
.RE
.PP
For instance, the following command meshes the [-2,2]x[-1\&.5, 1\&.5] rectangle: 
.PP
.nf
    mkgeo_grid -t 10 -a -2 -b 2 -c -1\&.5 -d 1\&.5 | geo -

.fi
.PP
 
.SH "BOUNDARY DOMAINS"
\fC-[no]sides\fP 
.PP
.RS 4
 The boundary sides are represented by domains: \fCleft\fP, \fCright\fP, \fCtop\fP, \fCbottom\fP, \fCfront\fP and \fCback\fP\&. 
.RE
.PP
\fC-[no]boundary\fP 
.PP
.RS 4
 This option defines a domain named \fCboundary\fP that groups all sides\&. 
.RE
.PP
By default, both sides and the whole boundary are defined as domains: 
.PP
.nf
    mkgeo_grid -t 10 -nosides | geo -
    mkgeo_grid -t 10 -noboundary | geo -
    mkgeo_grid -t 10 -noboundary -nosides | geo -

.fi
.PP
 
.SH "REGIONS"
\fC-[no]region\fP 
.PP
.RS 4
 The whole domain is split into two subdomains: \fCeast\fP and \fCwest\fP\&. Also, the separating domain is named \fCinterface\fP in the mesh\&. This option is used for testing computations with subdomains (e\&.g\&. transmission problem; see \fBusersguide\fP )\&. 
.RE
.PP
Example: 
.PP
.nf
    mkgeo_grid -t 10 -region | geo -

.fi
.PP
 
.SH "CORNERS"
\fC-[no]corner\fP 
.PP
.RS 4
 The corners (four in 2D and eight in 3D) are defined as OD-domains\&. This could be useful for some special boundary conditions\&. 
.RE
.PP
Example: 
.PP
.nf
    mkgeo_grid -t 10 -corner | geo -
    mkgeo_grid -T  5 -corner | geo -

.fi
.PP
 
.SH "COORDINATE SYSTEM OPTIONS"
.PP
\fC-cartesian\fP 
.br
\fC-rz\fP 
.br
\fC-zr\fP 
.PP
.RS 4
 Specifies the coordinate system\&. The default is \fCcartesian\fP while \fC-rz\fP and \fC-zr\fP 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 \fC\&.geo\fP\&. 
.RE
.PP
.SH "IMPLEMENTATION"
This documentation has been generated from file main/sbin/mkgeo_grid\&.sh 
.SH AUTHOR
Pierre  Saramito  <Pierre.Saramito@imag.fr>
.SH 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.