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<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.pdf">Introduction</a> (PDF, 210 kB)<br />
<a href="doc/first-steps.pdf">First Steps</a> (PDF, 130 kB)<br />
<a href="doc/internals.pdf">Internals</a> (PDF, 120 kB)<br />
<a href="doc/scheduling.pdf">Scheduling</a> (PDF, 120 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="status-reports.html">Status reports</a><br />
<a href="get-carpet-darcs.html">Download</a><br />
<a href="http://bugs.carpetcode.org/">Bugzilla</a><br />
<a href="feature-requests.html">Missing features</a><br />
<a href="contributors.html">Contributors</a></p>
<p><b>Visualisation</b><br />
<a href="visualisation-tools.html">Tools</a><br />
<a href="https://mailserv.aei.mpg.de/mailman/listinfo/visualization/">Mailing list</a></p>
<p><b>Results</b><br />
<a href="publications.html">Publications</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.whiskycode.org/">Whisky</a><br />
<a href="http://relativity.phys.lsu.edu/postdocs/matt/taka.php">Taka</a><br />
<a href="http://sbir.nasa.gov/SBIR/abstracts/05/sttr/phase1/STTR-05-1-T4.02-9864.html?solicitationId=STTR_05_P1">parca</a></p>
<p><b>Carpet Users</b><br />
<a href="http://numrel.aei.mpg.de/">AEI Potsdam</a><br />
<a href="http://zenith.as.arizona.edu/~burrows/">Arizona Supernova Group</a><br />
<a href="http://www.astro.auth.gr/Science-Subjects/Gravity.html">AUTH</a><br />
<a href="http://ww2.tpi.uni-jena.de/gravity/">Jena</a><br />
<a href="http://www.kisti.re.kr/english/">KISTI</a><br />
<a href="http://www.cct.lsu.edu/">LSU</a><br />
<a href="http://www.mpa-garching.mpg.de/hydro/index.shtml">MPA Garching</a><br />
<a href="http://www.fis.unipr.it/">Parma</a><br />
<a href="http://www.gravity.psu.edu/numrel/">Penn State</a><br />
<a href="http://astrophysics.rit.edu/">RIT</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><br />
<a href="http://www.tat.physik.uni-tuebingen.de/">TAT/CPT</a><br />
<a href="http://www2.polito.it/ricerca/relgrav/">Torino</a><br />
<a href="http://research.physics.uiuc.edu/CTA/IRG/">UIUC</a><br />
<a href="http://www.nuclecu.unam.mx/~gravit/Gravit/">UNAM</a><br />
<a href="http://cgwa.phys.utb.edu/">UTB</a></p>
<p><b>Feedback</b><br />
<a href="mailto:schnetter@carpetcode.org">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 makes 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 later brought into
production use by Erik Schnetter, Scott Hawley, and Ian Hawke at
the <a href="http://www.aei.mpg.de/">AEI</a> (Max-Planck-Institut
f�r Gravitationsphysik, Albert-Einstein-Institut). Carpet is
currently maintained at
the <a href="http://www.cct.lsu.edu/">CCT</a> (Center for
Computation & Technology) at LSU. These pages describe Carpet
and its current development.</p>
<hr />
<h2>News</h2>
<p><b>September 26, 2006:</b> We are preparing a new release of
Carpet. This will be Carpet version 3. Among other things, this
version makes it easier to use dynamic grid structures, shows
better scaling behaviour than version 2, and has better support
for multiple patches. A detailed list of changes
is <a href="version-3.html">here</a>. The
the <a href="get-carpet-darcs.html">downloading instructions</a>
for Carpet explain how to access this version.</p>
<p><b>February 26, 2006:</b> We have started to collect
a <a href="publications.html">list of publications and theses</a>
that use Carpet. Please tell us if you have written a publication
or a thesis using Carpet.</p>
<p><b>February 25,
2006:</b> <a href="http://www.aei.mpg.de/~cott/">Christian Ott</a>
has contributed code to Carpet, making the refined regions track
apparent horizon centroids, merging and un-merging refined regions
as necessary. (<a href="movies/bh2.gif">Movie</a>, animated gif,
730 kB.) After Burkhard Zink's mechanism
which <a href="http://arxiv.org/abs/gr-qc/0501080">tracks the
density maximum in a star</a>, this is the second implementation
of a production level adaptive mesh refinement criterion in
Carpet.</p>
<p><b>February 25, 2006:</b> The
official <a href="http://www.cactuscode.org/Benchmarks/">Cactus
benchmarks</a> now include benchmarks with Carpet. You can assess
Carpet's scaling and compare its performance on different machines
by generating graphs from the benchmark result database on these
pages.</p>
<p><b>July 15, 2005:</b> We have now a page that links to <a
href="status-reports.html">all past montly status reports</a>.</p>
<p><b>June 6, 2005:</b> We have updated the <a
href="get-carpet-darcs.html">downloading instructions for
Carpet</a>.</p>
<p><b>June 6, 2005:</b> Version 1.0.3 of the pre-compiled darcs
binary is <a href="get-carpet-darcs.html">now available</a>.</p>
<p><b>April 13, 2005:</b> Thomas Radke has implemented a new
communication scheme in Carpet. Instead of sending many small
messages in an interleaved manner, Carpet now collects all
messages into an internal buffer and sends only one big message
with MPI. This circumvents certain problems with internal
limitations of MPICH, and it also improves the performance
greatly.</p>
<p><b>March 9, 2005:</b> We have started to move towards a new
stable version of 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.pdf">introduction</a>
(PDF, 210 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.gravity.psu.edu/numrel/people/sperhake_ulrich.html">Ulrich
Sperhake</a> wrote a tutorial outlining the <a
href="doc/first-steps.pdf">first steps</a> (PDF, 130 kB)
that one has to take to install Carpet and run an example
application.</li>
<li>An explanation of the <a href="doc/internals.pdf">internal
workings</a> (PDF, 120 kB) of Carpet. You should read
this if you want to modify Carpet.</li>
<li>An explanation of
<a href="doc/scheduling.pdf">how scheduling works</a>
(PDF, 120 kB) in (PUGH and) Carpet. This may be
useful for setting up mixtures of local and global operations.</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>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>
<tr>
<td valign="top">
<p><a href="pictures/multipatch-3phi-error.jpeg"><img
src="pictures/thumbnail-multipatch-3phi-error.jpeg" height="80"
width="80" alt="error function" /></a></p>
</td>
<td valign="top">
<p>The error in a multipatch numerical simulation of scalar wave
propagation in a hollow spherical shell. The coarse- and fine-grid
surface show the numerical errors (computed solution - exact solution)
computed at two different resolutions, with the low resolution error
divided by 16. The fact that the two surfaces overlap nicely shows
that the errors scale as the 4th power of the grid resolution.
This simulation was performed by Jonathan Thornburg.</p>
</td>
<td valign="top">
</td>
<td valign="top">
<p><a href="pictures/matter-density.jpeg"><img
src="pictures/thumbnail-matter-density.jpeg" height="80"
width="80" alt="matter density" /></a></p>
</td>
<td valign="top">
<p>The fate of a proto-neutron-star barmode deformation.
Matter density at z=0 during the transition from an m=2 deformed star
to an m=1 deformed one. The light on the right is used to emphasizes
the spiral arms which are responsible for a small mass loss.
This simulation was performed by Gian Mario Manca.</p>
</td>
</tr>
</table>
<p>Moving pictures: We can show
a <a href="movies/waveamr.gif">movie</a> (animated gif,
3.3 MB) of a scalar wave equation with adaptive mesh
refinement. The refinement criterion is a very simplistic local
truncation error estimate. We also have
a <a href="movies/bh2.gif">movie</a> (animated gif, 730 kB)
of a moving refinement region tracking a black hole.</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/Visualization/ImportCarpetHDF5">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.whiskycode.org/">Whisky</a></li>
<li>I/O: <a href="http://www.hdfgroup.org/HDF5/">HDF5</a>, <a
href="http://www.fiberbundle.net/">F5</a></li>
<li>Visualisation: <a href="http://www.amiravis.com/">Amira</a>,
<a href="http://www.opendx.org/">OpenDX</a></li>
</ul>
<hr />
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<address><a href="mailto:schnetter@uni-tuebingen.de">Erik Schnetter</a></address>
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