Hi Erik,
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.
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.
Cheers,
Phil
On 9/26/17 6:38 PM, Erik Schnetter wrote:
Phil
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.
-erik
On Tue, Sep 26, 2017 at 3:29 AM, Philip Chang <[email protected]
<mailto:[email protected]>> wrote:
Dear developers,
I saw that there was a discussion back in 2015 in regard to SPH in the
Einstein toolkit. Have any progress been made in this regard? I am
especially interested in how the sph particles move (and what it means
to move) in a 3+1 split.
Cheers,
Phil Chang
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Erik Schnetter <[email protected] <mailto:[email protected]>>
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