[ET Trac] [Einstein Toolkit] #2119: The binary neutron star gallery example gives different results with the release candiate.

[Einstein Toolkit]

#2119: The binary neutron star gallery example gives different results with the
release candiate.
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  Reporter:  Peter Diener  |      Owner:  Peter Diener
      Type:  defect        |     Status:  assigned
  Priority:  blocker       |  Milestone:  ET_2018_02
 Component:  Other         |    Version:  development version
Resolution:                |   Keywords:
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Comment (by Peter Diener):

 A part of the difference comes from a change to Meudon_Bin_NS to use
 EOS_Omni in commit:  1b9d6a3eff34224a357a61e3b74d5468f8efa82b. After this
 change some variables have slightly different profiles on the initial data
 slice. This affects: hydrobase::press, hydrobase::eps, grhydro::tau and
 grhydro::scon. The following plot shows the maximum density as function of
 time for 3 different runs. The red curve is for the original code at the
 time of the creation of the gallery example. The green curve is for the
 current development version of the toolkit. The blue curve is for the
 current development version with Meudon_Bin_NS reverted to the commit
 before the EOS_Omni commit.

  [[Image(dens_compare.png)]]

 As can be seen the blue and red curves agrees much better up to the
 merger, but still some differences appear after that.

 The affect on the Psi_4 waveform can be seen here where I have zoomed in
 to the merger and post-merger phase:

 [[Image(psi4_compare.png)]]

 Also in this case, the agreement is better between the red and blue
 curves, but significant differences still appear late in the waveform.

 I don't know if Meudon_Bin_NS is more correct before or after the commit
 mentioned above. And I don't know what then causes the additional
 differences.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/2119#comment:10>
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