<div dir="auto">OK~ Thank you for the information. </div><br><div class="gmail_quote"><div dir="ltr">Roland Haas <<a href="mailto:rhaas@illinois.edu">rhaas@illinois.edu</a>> 於 2018年11月8日 週四 下午11:26 寫道：<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Jie,<br>
<br>
you will most likely need another thorn. I would say the closest thorn<br>
that does what you would like to do is the "Outflow" thorn (in<br>
EinsteinAnalysis/Outflow) that can track the amount of rest mass<br>
flowing through a SphericalSurface. So you could make it measure the<br>
amount of material crossing the apparent horizon and also eg the among<br>
falling through the innermost stable circular orbit.<br>
<br>
For energy you'd have to decide on some efficiency of converting rest<br>
mass to energy (for the material falling through the ISCO).<br>
<br>
You can use the Outflow test file as a starting point (and also consult<br>
its documentation:<br>
<a href="https://www.einsteintoolkit.org/thornguide/EinsteinAnalysis/Outflow/documentation.html" rel="noreferrer noreferrer" target="_blank">https://www.einsteintoolkit.org/thornguide/EinsteinAnalysis/Outflow/documentation.html</a>): <a href="https://bitbucket.org/einsteintoolkit/einsteinanalysis/raw/05e1f24828dc5a0a819d57225957954da538c031/Outflow/test/moving_tov.par" rel="noreferrer noreferrer" target="_blank">https://bitbucket.org/einsteintoolkit/einsteinanalysis/raw/05e1f24828dc5a0a819d57225957954da538c031/Outflow/test/moving_tov.par</a><br>
<br>
Yours,<br>
Roland<br>
<br>
> Dear all,<br>
> I want to add energy into the accretion disk of the binary neutron star<br>
> merger in gallery code(<a href="https://einsteintoolkit.org/gallery/bns/index.html)and" rel="noreferrer noreferrer" target="_blank">https://einsteintoolkit.org/gallery/bns/index.html)and</a><br>
> calculate the accretion rate (dM/dt) do I need to add some other thorn into<br>
> the simulation, or could just modify the parameter file of the gallery code?<br>
> Thank you<br>
> Gratefully,<br>
> Jie<br>
<br>
<br>
<br>
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</blockquote></div>