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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15" />
<title>CarpetCode</title>
</head>
<body>
<h1 align="center">CarpetCode</h1>
<table>
<tr>
<td valign="top" bgcolor="#ffcc77" width="1%">
<p><b>CarpetCode</b><br />
<a href="http://www.carpetcode.org/">home page</a></p>
<p><b>Documentation</b><br />
<a href="doc/documentation.ps">Introduction</a> (ps, 300 kB)<br />
<a href="doc/first-steps.ps">First Steps</a> (ps, 160 kB)<br />
<a href="doc/internals.ps">Internals</a> (ps, 130 kB)</p>
<p><b>Mailing lists</b><br />
<a href="http://lists.carpetcode.org/listinfo/developers/">Subscribe</a><br />
<a href="http://lists.carpetcode.org/archives/developers/">Archive</a><br />
<a href="http://lists.carpetcode.org/listinfo/carpet-cvs/">CVS messages</a><br />
<a href="http://lists.carpetcode.org/listinfo/carpet-darcs/">darcs messages</a></p>
<p><b>Development</b><br />
<a href="http://darcs.net/">Darcs</a><br />
<a href="http://bugs.carpetcode.org/">Bugzilla</a><br />
<a href="feature-requests.html">Missing features</a></p>
<p><b>Related</b><br />
<a href="http://www.cactuscode.org/">Cactus</a><br />
<a href="http://numrel.aei.mpg.de/">numrel@aei</a><br />
<a href="http://www.aei.mpg.de/~hawke/Whisky.html">Whisky</a></p>
<p><b>Carpet Users</b><br />
<a href="http://numrel.aei.mpg.de/">AEI Potsdam</a><br />
<a href="http://www.cct.lsu.edu/">CCT</a><br />
<a href="http://www.mpa-garching.mpg.de/hydro/index.shtml">MPA Garching</a><br />
<a href="http://www.astro.psu.edu/nr/">Penn State</a><br />
<a href="http://www.sissa.it/ap/RelAstro/">SISSA</a><br />
<a href="http://www.maths.soton.ac.uk/applied/relativity/">Southampton</a></p>
<p><b>Feedback</b><br />
<a href="mailto:schnetter@aei.mpg.de">Send email</a></p>
</td>
<td valign="top">
<p>Carpet is a mesh refinement driver for <a
href="http://www.cactuscode.org/">Cactus</a>. Cactus is a
framework for solving time-dependent partial differential
equations on uniform grids, and Carpet is an extension of Cactus
that make mesh refinement possible. Carpet was originally written
in 2001 by <a
href="http://www.tat.physik.uni-tuebingen.de/~schnette/">Erik
Schnetter</a> at the <a
href="http://www.tat.physik.uni-tuebingen.de/">TAT</a>
(Theoretische Astrophysik T�bingen) and is currently maintained at
the <a href="http://www.aei.mpg.de/">AEI</a> (Max-Planck-Institut
f�r Gravitationsphysik, Albert-Einstein-Institut). These pages
describe Carpet and its current development.</p>
<hr />
<h2>News</h2>
<p><b>December 7, 2004:</b> Jonathan Thornburg is organising a <a
href="design-walkthrough.html">Carpet Design Walkthrough</a>,
which will take place December 13 to 15 at the AEI and will be
broadcast via the accessgrid and/or telephone.</p>
<p><b>Sepbember 18, 2004:</b> There is now a new repository for
the development version of Carpet. This repository is managed by
<a href="http://darcs.net/">darcs</a> instead of <a
href="https://www.cvshome.org/">CVS</a>. Darcs has a number of
advantages, such as being able to use it while offline, or keeping
some changes to yourself while developing. This development
version is <a href="get-carpet-darcs.html">publicly available</a>,
and we encourage you to <a
href="work-with-darcs.html">contribute</a>. Note that the stable
version of Carpet is still distributed via CVS.</p>
<p><b>August 24, 2004:</b> The version of Carpet in the CVS
repository is now stable. That means that this version will see
no substantial further development. One of its main goal is to
not change, so that parameter files continue to work unchanged
with identical results. We will continue to correct errors that
we find in this version of Carpet; however, if this would
necessitate major changes, and there is a work-around, then this
might not happen in the interest of stability.</p>
<p><b>July 31, 2004:</b> Carpet seems to have reached a point
where it is stable enough to be useful for at least some projects.
Consequently, people expressed the wish to have a version of
Carpet which is stable and sees no disrupting development. The
idea is to have two "branches" of Carpet: a stable version for
production use, and a development version which might not be as
stable. We plan to make the split in about three weeks. The
discussion about this is held on the mailing list; your input is
welcome.</p>
<p><b>April 7, 2004:</b> Up to now, all Carpet thorns have been
living in a single arrangement for Cactus. This caused problems,
because stable thorns, development thorns, and outdated thorns
were sitting next to each other, confusing newcomers. We have <a
href="#getting-the-code">moved the Carpet arrangement</a> to a new
repository and split it into four. Access to the old Carpet
arrangement has been disabled.</p>
<p><b>March 3, 2004:</b> We have recently had trouble with I/O
throuth the <a
href="http://zeus.ncsa.uiuc.edu/~jshalf/FlexIO/">FlexIO</a>
library. We suspect that it might have a bug that causes HDF5
output to fail under certain, random conditions. We have written
a new thorn CarpetIOHDF5 which uses the <a
href="http://hdf.ncsa.uiuc.edu/HDF5/">HDF5</a> library directly,
while remaining compatible to the FlexIO file format. Please test
this thorn, and report any problems or incompatibilities you
find.</p>
<p>In <b>January 2004</b>, <a
href="http://www.tat.physik.uni-tuebingen.de/~kobras/">Daniel
Kobras</a> set up <a href="http://bugs.carpetcode.org/">Bugzilla
for Carpet</a>. <a href="http://www.bugzilla.org/">Bugzilla</a>
is a bug-tracking system that will, so we hope, help us remember
what is missing or broken in Carpet.</p>
<p><a href="olds.html"><b>Old News...</b></a></p>
<hr />
<h2>Documentation</h2>
<p>We have accumulated a few pieces of documentation:</p>
<ul>
<li>An <a href="doc/documentation.ps">introduction</a>
(ps, 300 kB) to Carpet, as well as a guide to the
first steps for using it. Everybody should have read this.
(This is the same as the Arrangement Guide from the Carpet
sources.)</li>
<li><a
href="http://www.astro.psu.edu/nr/people/sperhake_ulrich.html">Ulrich
Sperhake</a> wrote a tutorial outlining the <a
href="doc/first-steps.ps">first steps</a> (ps, 160 kB)
that one has to take to install Carpet and run an example
application.</li>
<li>An explanation of the <a href="doc/internals.ps">internal
workings</a> (ps, 130 kB) of Carpet. You should read
this if you want to modify Carpet.</li>
<li>The individual Thorn Guides of Carpet. They are available
with the source code. They give details about the thorns' APIs
and user interfaces.</li>
<li>Thanks to <a
href="http://www.stack.nl/~dimitri/doxygen/">Doxygen</a>, we now
have an <a href="doxygen/html/index.html">overview</a> over all
the routines and data structures in Carpet. Most individual
Doxygen tags are still missing, but the extracted documentation
is already very useful. (The online documentation might not
always be up to date; in case of doubt, extract the
documentation yourself.)</li>
</ul>
<hr />
<h2>Interacting with the developers</h2>
<p>Most discussions about Carpet, i.e. user questions, feature
requests, and bug reports, are held on the Carpet developers'
mailing list <a
href="mailto:developers@lists.carpetcode.org">developers@lists.carpetcode.org</a>.
You can subscribe and unsubscribe from our <a
href="http://lists.carpetcode.org/">list management web page</a>.
You will also find the mailing list archive there. We thank <a
href="http://www.tat.physik.uni-tuebingen.de/~kobras/">Daniel
Kobras</a> for managing the mailing list server.</p>
<p>We have started to use <a
href="http://www.bugzilla.org/">Bugzilla</a> to keep track of
requested features or reported bugs in Carpet. You can submit or
comment on issues from our <a
href="http://bugs.carpetcode.org/">Bugzilla pages</a> once you
have created an account there. The old <a
href="feature-requests.html">list of missing features</a> have not
yet been moved over to Bugzilla.</p>
<hr />
<h2 id="getting-the-code">Getting the code</h2>
<p>Carpet is distributed under the <a
href="http://www.gnu.org/licenses/licenses.html">GNU General
Public License (GPL)</a>. It might be released under the GNU
Lesser General Public License (LGPL) in the future, to match the
distribution terms of Cactus.</p>
<p>Carpet is a driver for Cactus. It works as a part of Cactus,
and you will need to have the developers' version of Cactus
installed before you can use Carpet. Please look at the <a
href="http://www.cactuscode.org/">Cactus web pages</a> for an
introduction to Cactus and for installation instructions.</p>
<p>Carpet is available via anonymous <a
href="http://www.cvshome.org/">CVS</a>. The CVSROOT is
<code>:pserver:cvs_anon@cvs.carpetcode.org:/home/cvs/carpet</code>,
and there are several arrangements, each living in a directory.
The arrangement <code>Carpet</code> contains the basic driver part
that everybody needs. The arrangement <code>CarpetExtra</code>
contains useful add-ons and some example code. Development of new
thorns happens in the <code>CarpetDev</code> arrangement, which
means that the code in there is not to be trusted. And finally,
there is a graveyard arrangement <code>CarpetAttic</code> of
things that only used to be useful and are now in a state of
decay.</p>
<p>The password for anonymous CVS access is <code>anon</code>. We
thank the <a
href="http://www.tat.physik.uni-tuebingen.de/">Institut f�r
Astronomie und Astrophysik</a> of the Universit�t T�bingen for
hosting the CVS server.</p>
<hr />
<h2>Pretty pictures</h2>
<p>Here are some pretty pictures of simulations that were
performed with Carpet:</p>
<table>
<tr>
<td valign="top" width="10%">
<p><a href="pictures/meudon-lapse-height.png"><img
src="pictures/thumbnail-meudon-lapse-height.png" height="80"
width="80" alt="lapse height field"/></a></p>
</td>
<td valign="top" width="38%">
<p>Cut through a binary black hole system. Height field of the
lapse function (approximately the time dilatation) in a binary
black hole system calculated from Meudon initial data. The
system is cut between the two black holes, so that only one
black hole is visible. The white boxes indicate the hierarchy
of refinement regions.</p>
</td>
<td valign="top" width="4">
</td>
<td valign="top" width="10">
<p><a href="pictures/quadrupole.jpeg"><img
src="pictures/thumbnail-quadrupole.jpeg" height="80" width="80"
alt="quadrupole wave" /></a></p>
</td>
<td valign="top" width="38%">
<p>A quadrupole wave. Two rotating scalar charges create a
quadrupolar wave, mimicing the gravitational wave trail of a
binary black hole system. The small bumps and riddles are
artifacts caused by the discontinuous charge distribution. To
be improved.</p>
</td>
</tr>
<tr>
<td valign="top">
<p><a href="pictures/meudon-lapse-iso.png"><img
src="pictures/thumbnail-meudon-lapse-iso.png" height="80"
width="80" alt="lapse isosurfaces" /></a></p>
</td>
<td valign="top">
<p>Lapse isosurfaces in a binary black hole system. The same
system as above, but the lapse function is rendered as
isosurfaces.</p>
</td>
<td valign="top">
</td>
<td valign="top">
<p><a href="pictures/collapse-vel-x.png"><img
src="pictures/thumbnail-collapse-vel-x.png" height="80"
width="80" alt="velocity component" /></a></p>
</td>
<td valign="top">
<p>A velocity component in a stellar core collapse. The x
component of the fluid velocity in a stellar core collapse.
This simulation was performed by Christian Ott.</p>
</td>
</tr>
</table>
<p>Sorry; no movies so far.</p>
<hr />
<h2>Making sense of results</h2>
<p>Three-dimensional time-dependent simulation results are
difficult enough to interpret when the grid is uniform. With mesh
refinement, the sheer amount of available data makes it necessary
to use professional tools to examine the data. This is not only
the case for "big physics runs", where one (should) know in
advance what to expect, but especially during development, where
things do not always go as planned. <a
href="http://www.aei.mpg.de/~tradke/">Thomas Radke</a> was kind
enough to write an <a
href="http://www.cactuscode.org/VizTools/OpenDX.html">import
module</a> for the visualisation tool <a
href="http://www.research.ibm.com/dx/">OpenDX</a>.</p>
<hr />
<h2>Related projects</h2>
<ul>
<li>Physics: <a href="http://www.cactuscode.org/">Cactus</a>, <a
href="http://numrel.aei.mpg.de/">numrel@aei</a>, <a
href="http://www.aei.mpg.de/~hawke/Whisky.html">Whisky</a></li>
<li>I/O: <a href="http://hdf.ncsa.uiuc.edu/HDF5/">HDF5</a>, <a
href="http://www.zib.de/benger/F5/doc/">F5</a></li>
<li>Visualisation: <a href="http://www.amiravis.com/">Amira</a>,
<a href="http://www.opendx.org/">OpenDX</a></li>
</ul>
<hr />
<p>
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<address><a href="mailto:schnetter@uni-tuebingen.de">Erik Schnetter</a></address>
<p>
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