[Commits] [svn:einsteintoolkit] www/ (Rev. 930)

knarf at cct.lsu.edu knarf at cct.lsu.edu
Thu Jan 24 14:21:13 CST 2013


User: knarf
Date: 2013/01/24 02:21 PM

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+<?php $title='Three-Dimensional General-Relativistic Hydrodynamic Simulations of Binary Neutron Star Coalescence and Stellar Collapse with Multipatch Grids';
+include_once($_SERVER['DOCUMENT_ROOT'].'/global/header.php');?>
+
+<h3>Monday, Feburary 04, 2013, 10am US central time</h3>
+<p>Within the usual Einstein Toolkit weekly meeting time WebEx will be used for audio,
+video and slides. The slides and recordings will later be available here.
+The talk is based on this <a href="http://arxiv.org/abs/1212.1191">paper</a>.
+</p>
+
+
+<h3>Abstract</h3>
+<p>
+I discuss the implementation and performance of multipatch grids in the general
+relativistic hydrodynamics code "GRHydro" (see http://arxiv.org/abs/1212.1191).
+Multipatch methods allow one to cover the computational domain with multiple
+curvi-linear grid patches that can be adapted to the problem symmetry. For
+instance, rectangular Cartesian grids are useful for the region directly
+covering the central source (such as a binary neutron star system), but
+spherical grids are more efficient in the far-away region, e.g. the
+gravitational wave zone.  Combining the different grid shapes can offer
+significant performance/accuracy benefits.  The multipatch implementation in
+GRHydro is based on overlapping grids where ghost data between patches is
+exchanged via high-order Lagrange interpolation polynomials for spacetime
+variables, and second-order essentially non-oscillatory (ENO) interpolation for
+fluid variables that may contain shocks and other discontinuities.  I describe
+the changes that were introduced to make GRHydro compatible with multipatch
+grids.  In addition, I also briefly describe the implementation of
+cell-centered adaptive mesh-refinement and refluxing, a technique of ensuring
+numerical flux conservation at mesh refinement boundaries (corresponding to
+conservation of mass, energy, and momentum in the absence of gravity).  I
+finally show the performance of the new updates to GRHydro by a number of test
+problems: (perturbed) TOV star, stellar collapse, and binary neutron star
+coalescence.
+</p>
+
+<h3>Presenter: Christian Reisswig</h3>
+<img src="reisswig-new-s.jpg" width="20%" align="right" alt="Christian Reisswig">
+<p>
+ NASA Einstein Postdoctoral Fellow in Theoretical Astrophysics at the <a
+ href="http://www.tapir.caltech.edu/">Theoretical Astrophysics (TAPIR) group</a>
+ at the <a href="http://www.caltech.edu/">California Institute of Technology</a>
+<p>
+
+<p>Research interests:
+I am interested in the modeling of gravitationally radiating sources such as
+coalescing compact binaries and collapsing stellar cores using numerical
+relativity.  This work involves extending our understanding of the physics of
+these sources, their dynamics, and their emitted gravitational wave signature.
+A prime goal is the construction of template banks to be used in gravitational
+wave observatories such as LIGO, Virgo and GEO600.  I develop and extend
+simulations based on Einstein's theory of general relativity that run on
+massively parallel computers.  A particular focus of my research has been on
+gravitational-wave extraction techniques and binary black hole merger physics.
+</p>
+
+<?php include_once($_SERVER['DOCUMENT_ROOT'].'/global/footer.php');?>



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--- seminars/index.php	2013-01-24 18:12:04 UTC (rev 929)
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 location are, besides here, announced on the Einstein Toolkit mailing list.
 </p>
 
+<h3>Upcoming Seminars</h3>
+<table border="1">
+ <tr><th>Date</th><th>Title</th><th>Presenter</th><th>Affiliation</th><th>Slides</th></tr>
+ <tr>
+  <td>2012/02/04</td>
+  <td><a href="2013_02_04/">Three-Dimensional General-Relativistic Hydrodynamic Simulations of Binary Neutron Star Coalescence and Stellar Collapse with Multipatch Grids</a></td>
+  <td>Christian Reisswig</td>
+  <td>California Institute of Technology</td>
+  <td>&nbsp;</td>
+ </tr>
+</table>
+
 <h3>Past Seminars</h3>
 <table border="1">
  <tr><th>Date</th><th>Title</th><th>Presenter</th><th>Affiliation</th><th>Slides</th><th>Recording</th></tr>



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