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Hi Erik,<br>
<br>
When you say most people, what do you mean? Is there an
implementation of SPH in a true dynamical spacetime? I know there
are a few under the assumption of conformal flatness, but I am not
aware of anyone with SPH in dynamical spacetime.<br>
<br>
Related to this, is there a reference I can look at which write out
the hydro equations in detail. It is not immediately obvious to me
that Rosswog's paper writes it as a hydrodynamic equation on the
coordinate manifold with lapse and shift. <br>
<br>
Cheers,<br>
Phil<br>
<br>
<div class="moz-cite-prefix">On 9/26/17 6:38 PM, Erik Schnetter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADKQjjdewfSu2GZ8+dwUncx3QzbHHuTKp2OROceqqRNq70UXVA@mail.gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<div dir="ltr">Phil
<div><br>
</div>
<div>Most people let SPH particles move on the background
("coordinate") manifold, with equations of motion similar to
those for the hydrodynamics field equations, i.e. taking lapse
and shift into account. This is a straightforward approach, as
e.g. the shape of a particle remains fixed in coordinate
shape. The simplicity of this approach is very attractive.</div>
<div><br>
</div>
<div>-erik<br>
</div>
<div><br>
</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Sep 26, 2017 at 3:29 AM, Philip
Chang <span dir="ltr"><<a href="mailto:chang65@uwm.edu"
target="_blank" moz-do-not-send="true">chang65@uwm.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Dear
developers,<br>
<br>
I saw that there was a discussion back in 2015 in regard to
SPH in the<br>
Einstein toolkit. Have any progress been made in this
regard? I am<br>
especially interested in how the sph particles move (and
what it means<br>
to move) in a 3+1 split.<br>
<br>
Cheers,<br>
<br>
Phil Chang<br>
<br>
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</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>Erik Schnetter <<a
href="mailto:schnetter@cct.lsu.edu" target="_blank"
moz-do-not-send="true">schnetter@cct.lsu.edu</a>><br>
<a
href="http://www.perimeterinstitute.ca/personal/eschnetter/"
target="_blank" moz-do-not-send="true">http://www.perimeterinstitute.ca/personal/eschnetter/</a></div>
<div><br>
</div>
</div>
</div>
</div>
</blockquote>
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