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gmsh.html

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    gmsh.html 14.15 KiB 
    <!---BEGINSCRIPT#!/bin/sh

BASEDIR=/usr/local/cgi-bin

echo Content-type: text/html
echo
cat << EOM 
ENDSCRIPT--->

<HTML>

<!--- PLEASE DO NOT EDIT the BEGINSCRIPT and ENDSCRIPT comments --->

<HEAD>

<TITLE>Gmsh homepage</TITLE>

<meta name="description" content="Gmsh is a free automatic
three-dimensional finite element mesh generator with pre- and
post-processing facilities.">

<meta name="keywords" content="free mesh generator, free finite element software,
mesh generation, mesh refinement, free, delaunay triangulation,
automatic, maillages automatiques, mailleur, modelisation, opengl,
maillages 3D, 3D meshes, 3-D meshes, maillages 3-D, voronoi,
adaptation de maillages, mesh adaptation, modeling">

<META name="Autor-Handle" content="Christophe.Geuzaine@advalvas.be">

</HEAD>

<body text="#000000" bgcolor="#ffffff" background="/gmsh/images/background.gif">

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<table width="100%" border=0 cellspacing=10 cellpadding=5>

<tr valign=bottom>

  <td width="130" align="right" valign=top><font size=-2  face="Helvetica, Arial" color="#fffff">

<!---BEGINSCRIPT
EOM
${BASEDIR}/n2l ${BASEDIR}/counter.gmsh
cat << EOM
page requests since<br>1998/05/24<p>
ENDSCRIPT--->

<!---BEGINMIRROR
This page is a mirror of <a href="/gmsh/">/gmsh/</a><p>
ENDMIRROR--->

<!---BEGINDATE$Date: 2001-02-21 08:58:43 $ENDDATE--->

Copyright &copy; 1998-2001<br>
J.-F. Remacle<br>
C. Geuzaine<br>

  </font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial">
    <font size="+3"><b>Gmsh</b></font>
    <p>
    <b>A three-dimensional finite element mesh generator with built-in pre- and
       post-processing facilities</b>
     
  </font></td>
    
</tr>

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  <td><spacer type="vertical" size=20>
  </td>

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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>General Description</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

Gmsh is an automatic three-dimensional finite element mesh generator,
primarily Delaunay, with built-in pre- and post-processing
facilities. Its primal goal is to provide a simple meshing tool for
academic test cases with parametric input and up to date visualization
capabilities. One of the strengths of Gmsh is its ability to respect a
characteristic length field for the generation of adapted meshes on
lines, surfaces and volumes. These adapted meshes can be mixed with
simple structured (transfinite, elliptic, etc.)  meshes in order to
augment the flexibility.

<!------------------------------------------------------------------>

<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Geometrical Entity Definition</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

Parameterized geometries are created by successively defining points,
oriented curves (segments, circles, ellipsis, splines, etc.), oriented
surfaces (plane surfaces, ruled surfaces, etc.)  and volumes. Compound
groups of geometrical entities can be defined, based on these
elementary parameterized geometric entities. Data can be defined
either interactively thanks to the menu system, or directly in the ASCII 
input files.

  </td>

</tr>

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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Mesh Generation</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

    A finite element mesh is a tessellation of a given subset of R^3 by
elementary geometrical elements of various shapes (in this case lines,
triangles, quadrangles, tetrahedra, prisms and hexahedra), arranged in
such a way that two of them intersect, if they do, along a common
face, edge or node, and never otherwise. All the finite element meshes
produced by Gmsh as unstructured, even if they were generated in
a structured way. This implies that the elementary geometrical
elements are defined only by an ordered list of their vertices (which
allows the orientation of all their lower order geometrical entities)
but no predefined relation is assumed between any two elementary
elements.
<p>
The procedure follows the same order as for the geometry creation:
curves are discretized first; the mesh of the curves is then used to
mesh the surfaces; then the mesh of the surfaces is used to mesh the
volumes. This automatically assures the continuity of the mesh when,
for example, two surfaces share a common curve. Every meshing step is
constrained by the characteristic length field, which can be uniform,
specified by characteristic length associated to elementary
geometrical entities, or associated to another mesh (the background
mesh).
<p>
For each meshing step (i.e. the discretization of lines, surfaces and
volumes), all structured mesh directives are executed first, and serve
as additional constraints for the unstructured parts. The implemented
Delaunay algorithm is subdivided in the following five steps for
surface/volume discretization:
<p>
<ol>
<li>
trivial meshing of a box including the convex polygon/polyhedron
defined by the boundary nodes resulting from the discretization of the
curves/surfaces; 
<li>
creation of the initial mesh by insertion of all the nodes on the
curves/surfaces thanks to the Bowyer algorithm; 
<li>
boundary restoration to force all the edges/faces of the
curves/surfaces to be present in the initial mesh;
<li>
suppression of all the unwanted triangles/tetrahedra (in
particular those containing the nodes of the initial box); 
<li>
insertion of new nodes by the Bowyer algorithm until the
characteristic size of each simplex is lower or equal to the
characteristic length field evaluated at the center of its
circumscribed circle/sphere.
</ol>


  </td>

</tr>

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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><p><b>Scalar and Vector Field Visualization</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

Multiple post-processing scalar or vector maps can be loaded and
manipulated (globally or individually) along with the geometry and the
mesh. Scalar fields are represented by iso-value curves or color maps
and vector fields by three-dimensional arrows or displacement
    maps. Post-processor functions include offsets, elevation, interactive
color map modification, range clamping, interactive and scriptable
animation, vector postscript output, etc. All post-processing options
can be accessed either interactively or through the the input ascii
files.

  </td>

</tr>

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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Documentation</b></font></td>

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  </td>

  <td><font face="Helvetica, Arial" size=-1>

Online <A target = "_top" href="/gmsh/doc/tutorial.html">tutorial</A>
and file <A target="_top" href="/gmsh/doc/FORMATS">formats</A>
description.

  </td>

</tr>

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<tr valign=top>

  <td width="130" align="right"> 
    <font color="#ffffff" face="Helvetica, Arial"><b>Download</b></font></td>

  <td width="60">
  </td>

  <td bgcolor="#ededed"><font face="Helvetica, Arial" size=-1>

<b>Latest Release: 1.15 (February 21, 2001)</b>
<p>
The development release of Gmsh is available for Windows, Linux,
Compaq Tru64 Unix and SGI IRIX. All executables are dynamically linked
with OpenGL.
<ul>
<li><A href="/gmsh/1.15/gmsh-win.zip">Windows zip archive (95/98/NT)</A>
<li><A href="/gmsh/1.15/gmsh-1.15-1.i386.rpm">Linux RPM (Red Hat 6.2 and compatible, i386, glibc 2.1)</A> 
<li><A href="/gmsh/1.15/gmsh-Linux.tgz">Linux tarball (i386, glibc 2.1)</A> 
<li><A href="/gmsh/1.15/gmsh-IRIX.tgz">SGI IRIX tarball (IRIX 6.5)</A> 
<li><A href="/gmsh/1.15/gmsh-OSF1.tgz">Compaq Tru64 tarball (OSF 4.0)</A> 
</ul>

<p><br>

<b>Stable Release: Version 1.00 (January 1, 2001)</b>
<p>
The stable release of Gmsh is available for most classical UNIX
platforms. All executables (no source distribution is available
for the moment) are dynamically linked with OpenGL and Motif. You
should have these libraries installed on your system, and in the
path of the library loader. Free replacements for OpenGL and Motif
can be found at <A target="_top"
href="http://mesa3d.sourceforge.net">http://mesa3d.sourceforge.net</A>
and <A target="_top"
href="http://www.lesstif.org">http://www.lesstif.org</A>.  (Linux
RPMs are directly available here: <A
href="/gmsh/thirdparty/Mesa-3.2-2.i386.rpm">Mesa-3.2-2.i386.rpm</A>,
    <A
href="/gmsh/thirdparty/lesstif-0.91.4-1.i386.rpm">lesstif-0.91.4-1.i386.rpm</A>.)
Remember that you may have to reconfigure the loader (ldconfig
under Linux) or modify the LD_LIBRARY_PATH (or SHLIB_PATH on HP)
in order for Gmsh to find these libraries.
<ul>
  <li><A href="/gmsh/1.00/gmsh-1.00-1.i386.rpm">Linux RPM (Red Hat 6.2 and compatible, i386, glibc 2.1)</A> 
  <li><A href="/gmsh/1.00/gmsh-Linux.tgz">Linux binary (i386, glibc 2.1)</A>
  <li><A href="/gmsh/1.00/gmsh-OSF1.tgz">Digital OSF 4.0/Compaq Tru64 binary</A>
  <li><A href="/gmsh/1.00/gmsh-SunOS.tgz">Sun OS 5.5.1 binary</A>
  <li><A href="/gmsh/1.00/gmsh-AIX.tgz">IBM AIX binary</A>
  <li><A href="/gmsh/1.00/gmsh-HP-UX.tgz">HP-UX 10.20 binary</A>
  <li><A href="/gmsh/1.00/gmsh-IRIX.tgz">SGI IRIX 6.5 binary</A>
</ul>
Tutorial and demos
<ul>
  <li><A href="/gmsh/1.00/gmsh-tutorial.tgz">Tutorial</A>
  <li><A href="/gmsh/1.00/gmsh-demos.tgz">Demo files</A>
</ul>

  </td>

</tr>


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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>What's new</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1> 

    <A href="/gmsh/doc/Changelog">Changelog</A>

  </td>

</tr>

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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Problems / Performance</b></font></td>

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  </td>

  <td><font face="Helvetica, Arial" size=-1>

<ul>
<li> If something goes wrong during the installation, it is likely
because some libraries are not properly installed on your system. Try
'ldd gmsh-name' to check all shared libraries dependencies. Warning:
HP version is reported not to work with native OpenGL -> install Mesa
instead.

<li> (Motif versions only) If, when moving the mouse over the graphic
window, everything that is drawn on it disappears, and each item is
visible only when the cursor is directly over it, you should start
Gmsh with the '-noov' command line option. (This will be fixed.)

<li> (Motif versions only) Turn double buffering off (with the -nodb
command line option) when working on a remote host with Mesa.

    <li> Try display lists (-dl option) when working with big
post-processing data sets.

<li> Disable opaque move in your window manager to prevent multiple
expose events when an option window partially hides the graphical
window.
</ul>

  </td>

</tr>


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<tr valign=top>

  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Authors</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1> 

Gmsh is developed by 
<A HREF="mailto:Remacle@scorec.rpi.edu">Jean-François Remacle</A> and
<A HREF="mailto:Christophe.Geuzaine@ulg.ac.be">Christophe Geuzaine</A>.
Feel free to contact us to send bugs, remarks or nice pictures you achieved
with Gmsh (we'll put them on the web site).

  </td>

</tr>

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  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Gallery</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

Some pictures made with Gmsh:
<ul>
<li> Meshes of 
     <A href="/gmsh/gallery/Mesh1D.gif">lines</A>, 
     <A href="/gmsh/gallery/Mesh2DCiss.gif">surfaces</A> and 
     <A href="/gmsh/gallery/Mesh3D.gif">volumes</A> 
     respecting a given characteristic length field (d(r) = a (sin(X) * sin (Y)) + b).
<li> 3D mesh of an 
     <A href="/gmsh/gallery/bigelec4.gif">electrical component</A>
     (courtesy S.K. Choi).
<li> First example in the tutorial:
     <A href="/gmsh/gallery/ex01-2.gif">pict1</A>, 
     <A href="/gmsh/gallery/ex01-3.gif">pict2</A>, 
     <A href="/gmsh/gallery/ex01-4.gif">pict3</A>.
<li> A mechanical part in the demo files: 
     <A href="/gmsh/gallery/ex09-0.gif">pict1</A>, 
     <A href="/gmsh/gallery/ex09-1.gif">pict2</A>, 
     <A href="/gmsh/gallery/ex09-2.gif">pict3</A>.
<li> Mach number on a F16 
     <A href="/gmsh/gallery/f16-1.gif">pict1</A>,
     <A href="/gmsh/gallery/f16-2.gif">pict2</A>,
     <A href="/gmsh/gallery/f16-3.gif">pict3</A>,
     <A href="/gmsh/gallery/f16-5.gif">pict4</A> (courtesy P. Geuzaine).
    <li> Example of on-screen information display: 
     <A href="/gmsh/gallery/infodisplay1.gif">1</A>, 
     <A href="/gmsh/gallery/infodisplay2.gif">2</A>.
<li> A 3D <A href="/gmsh/gallery/adap.gif">adapted mesh</A>.
<li> Smooth 2D <A href="/gmsh/gallery/blob.gif">colormap</A>.
<li> Some didactic animations about computational electromagnetics at 
     <A target="_top" href="http://elap.montefiore.ulg.ac.be/elm/demos_en.html">ELAP</A>.
</ul>

  </td>

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  <td width="130" align="right">
    <font color="#ffffff" face="Helvetica, Arial"><b>Links</b></font></td>

  <td width="60">
  </td>

  <td><font face="Helvetica, Arial" size=-1>

Check out <A TARGET="_top" HREF="/getdp/">GetDP</A>, a scientific
computation software for the numerical solution of
integro-differential equations, using finite element and integral type
methods.

  </font></td>

</tr>

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</table>

<p>

</BODY>
</HTML>

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