[Users] question about MHD tests for GRHydro

[Hee Il Kim]

Hi,

I'm doing the BNS test with magnetic fields but it's just in the
beginning stage. I don't know whether other people or the MHD
developers have done the test for the BNS. The BNS simulations with
the ET requires somewhat different setup from Whisky+BSSN_MoL. I'm
using a private thorn of Frank for the AMR. For the initial data, I
modified the public bns reader, Meudon_Bin_NS.

Currently, I have little information on the best parameter setup for
the MHD. Please let me know if there's any special  treatment required
for the MHD. Also I'd like to hear from Bruno on the initial B-field
data. Do I need anything more than I can expect from the initial
vector potential you used in the literatures?

Thanks in advance,

Hee Il

2011/10/18 Bruno Giacomazzo <bruno.giacomazzo at jila.colorado.edu>:
> Hi,
> I have some questions about the MHD version of GRHydro. Today I had a
> business meeting at the time of the telecon, otherwise I'd have asked them
> during the telecon.
> It is my understanding that the next release of the ET will happen next week
> and it will contain MHD. Did you do already some tests in GR? Did you try
> the evolution of BNS with magnetic fields? I'd like to try to run the code
> with magnetized BNS and see how it compares with Whisky. As some of you know
> in the past I had problems with divergence cleaning (DC) when evolving BNS
> (strong violations of divB after the merger when the BH and the torus are
> formed when using AMR) and so I'm curious to see if the implementation of DC
> in GRHydro is more robust than the one I have in Whisky.
> Thanks,
> Bruno
> P.S.: I will try to join the next ET telecon, so that I can get an update
> before coming to LSU.
> Dr. Bruno Giacomazzo
> JILA - University of Colorado
> 440 UCB
> Boulder, CO 80309
> USA
> Tel.  : +1 303-492-0389
> Fax  : +1 303-492-5235
> email : bruno.giacomazzo at jila.colorado.edu
> web: http://www.brunogiacomazzo.org
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