.TH "mkgeo_ball" 1rheolef "Version 7.2" "rheolef" \" -*- nroff -*-
.ad l
.nh
.SH NAME
mkgeo_ball \- unstructured mesh of an ellipsoid (rheolef-7\&.2)
.PP
    
.SH "SYNOPSIS"
.PP
.nf
mkgeo_ball [options] [n]
.fi
.PP
 
.SH "EXAMPLE"
mkgeo_ball -t 10 | geo -
.PP
The previous command build a triangle based 2d unstructured mesh of the unit ball
.SH "DESCRIPTION"
This command is useful when testing programs on simple geometries\&. Invocation is similar to those of \fBmkgeo_grid(1)\fP \&. It calls \fCgmsh\fP as unstructured mesh generator\&. It avoid the preparation of an input file for a mesh generator\&. The optional \fIn\fP argument is an integer that specifies the subdivision in each direction\&. By default n=10\&. The mesh files goes on standard output\&.
.SH "THE MESH ORDER"
.PP
\fC-order\fP \fIint\fP 
.PP
.RS 4
 The polynomial approximation mesh order, for the curved boundary, as defined by \fCgmsh\fP\&. Default is order=1\&. 
.RE
.PP
.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
\fC-tq\fP 
.PP
.RS 4
 2d mesh using both triangles and quadrangles\&. 
.RE
.PP
\fC-TP\fP 
.br
\fC-PH\fP 
.br
\fC-TPH\fP 
.PP
.RS 4
 3d mixed mesh combining tetrahedra, prisms and/or 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 ellipse/ellipsoid inscribed in the [a,b]x[c,d] rectangle or the [a,b]x[c,d]x[f,g] parallelepiped\&. By default a=c=f=-1 and b=d=g=1, thus, the unit balls are considered\&. 
.RE
.PP
\fC-s\fP 
.PP
.RS 4
 Only a surface mesh is generated: a curved line in 2d or a curved surface mesh in 3d\&. In 3d, supports both '-t' and '-q' options\&. 
.RE
.PP
.SH "BOUNDARY DOMAINS"
The meshes defines a domain named \fCboundary\fP that groups all boundary sides\&.
.SH "OTHERS OPTIONS"
\fC-[no]fix\fP 
.PP
.RS 4
 By default, internal face and volume node from gmsh are recomputed, since they have incorrect coordinate that destroy the convergence properties of isoparametric high order elements (order >= 3)\&. The \fC-nofix\fP option skip this correction: this option is available for test purpose\&. 
.RE
.PP
\fC-[no]clean\fP 
.PP
.RS 4
 Clear temporary files (this is the default)\&. 
.RE
.PP
\fC-[no]verbose\fP 
.PP
.RS 4
 Print intermediate commands and information messages\&. 
.RE
.PP
.SH "IMPLEMENTATION"
This documentation has been generated from file main/sbin/mkgeo_ball\&.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.