[Users] Spacetime evolution with hydro refluxing
Jens.Mahlmann at uv.es
Thu Jan 10 09:54:27 CST 2019
thank you very much for your mail. I hope I may bother you again
with an Amateur question - I am surely misunderstanding something.
The parameter Carpet::prolongation_order_space gives the
interpolation order for the reconstruction of coarse grid points
from the finely refined grids. In the par-examples of Refluxing I
find Carpet::prolongation_order_space set to 1 and 3 (i.e.
different values). If for the refluxing the parameter Carpet::refinement_centering
is set to "cell", then gridpoints should be aligned from fine to
coarse grids. My question is if the prolongation_order_space makes
a difference for "cell" centered refinement? This is the parameter
which costs me a lot of time when changing to higher order, so I
want to understand this.
Thank you very much and my best!
-------- Original message --------From: Erik Schnetter <schnetter at cct.lsu.edu> Date: 1/10/19 01:59 (GMT+01:00) To: Jens Mahlmann <jensmahl at alumni.uv.es> Cc: Einstein Toolkit Users <users at einsteintoolkit.org> Subject: Re: [Users] Spacetime evolution with hydro refluxing
If a horizon is not found, then I suspect insufficient resolution. You should be able to choose different prolongation operators for spacetime and hydrodynamics. Since the geometry is not refluxed, you could use a higher order operation there, while staying with linear interpolation for hydro.
On Wed, Jan 9, 2019 at 3:05 PM Jens Mahlmann <jensmahl at alumni.uv.es> wrote:
I have recently changed my hydro simulations to the Refluxing
strategy implemented by Erik Schnetter. For this I have changed
the standard configuration to a cell centred refinement,
staggered boundaries and low order spatial prolongation for the
hydro variables. Since then I experience problems with BSSN
or, more specifically, the QuasilocalMeasures thorn (a=0.9 black
hole). After an initially fine behaviour, no Eigenvector with
value one is found and the spacetime gradually crashes.
I am still puzzled where this is coming from. Does anybody have
some experience with the combination spacetime evolution + hydro
refluxing, i.e. the somewhat different grid setup? I would be glad
for any input to see where I start to fix my work.
Thank you very much and my best from Valencia
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Erik Schnetter <schnetter at cct.lsu.edu>
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