Thank you Shawn for the clarification. I didn’t realize the integration part. Always focused on the psi4 before. That’s really helpful.
Regards, Qingwen Shawn Rosofsky <[email protected]>于2018年9月18日 周二上午10:02写道： > Hi Qingwen, > > There is nothing unusual about your current waveform that I can see. The > weirdness comes from the fact that the waveform is incomplete and hence > does not decay to zero at the final time. This messes up the integration > from psi4 to h and causes the strange bouncing around that you currently > see. If you were to compare the raw psi4 data of the two waveforms, I'd > expect they would agree quite closely. In general, you should probably > refrain from looking at the strain data until your simulation has run to > completion. > > This issue is quite common with neutron star waveforms which don't always > go to zero at the final time. It can be resolved by tapering the end of > the psi4 data to ensure that it does decay to zero at the final time. > > Best, > Shawn > > On Tue, Sep 18, 2018, 8:43 AM Qingwen Wang <[email protected]> > wrote: > >> Hi all, >> >> I am using Einstein toolkit to simulate binary black hole merger, and I >> was trying to repeat https://einsteintoolkit.org/gallery/bbh/index.html. >> But I end up with a weird waveform like(I did not finish all the >> simulation, but it has started to look weird of the peak around t=300) >> [image: image.png] >> rather than(the right one ) >> >> [image: image.png] >> I am planning to run it again for a longer time, it would be really >> helpful if anyone knows what's wrong with my last running so that I can >> edit it before redoing it. Thank you for your time. >> >> Regards, >> Qingwen >> > _______________________________________________ >> Users mailing list >> [email protected] >> http://lists.einsteintoolkit.org/mailman/listinfo/users >> >
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