<html>#2540: Unexpected Hamiltonian violation from Carpet boundaries, using CCZ4
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<tr><td style='text-align:right'> Reporter:</td><td>KennethZen</td></tr>
<tr><td style='text-align:right'> Status:</td><td>new</td></tr>
<tr><td style='text-align:right'>Milestone:</td><td>ET_2020_05</td></tr>
<tr><td style='text-align:right'> Version:</td><td>ET_2020_05</td></tr>
<tr><td style='text-align:right'> Type:</td><td>bug</td></tr>
<tr><td style='text-align:right'> Priority:</td><td>major</td></tr>
<tr><td style='text-align:right'>Component:</td><td>Carpet</td></tr>
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<p>Comment (by Roland Haas):</p>
<p>Peter Diener addressed some of this in the mailing list: <a data-is-external-link="true" href="http://lists.einsteintoolkit.org/pipermail/users/2021-July/008064.html" rel="nofollow">http://lists.einsteintoolkit.org/pipermail/users/2021-July/008064.html</a></p>
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<blockquote>
<p>It is expected that the mesh refinement boundaries will reflect Hamiltonian constraint violations. From what you have provided us, it is not clear whether the level of constraint violations that you see is a cause of concern. You specifically mention CCZ4, but have you tried with BSSN? Does the constraint violations look better, the same, or worse with BSSN?</p>
<p>It is also possible that an issue like this might be caused by some other problem potentially related to parameter settings, so in order to investigate this can you provide your thornlist and parameter file?</p>
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<p>--<br/>
Ticket URL: <a href='https://bitbucket.org/einsteintoolkit/tickets/issues/2540/unexpected-hamiltonian-violation-from'>https://bitbucket.org/einsteintoolkit/tickets/issues/2540/unexpected-hamiltonian-violation-from</a></p>
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