[Users] Some questions about new release 2013_05

[Petr Tsatsin]

Hello Frank,
Thank you for suggestions.


On Wed, Jun 19, 2013 at 10:11 PM, Frank Loeffler <knarf at cct.lsu.edu> wrote:

> Hi Petr,
>
> On Tue, Jun 18, 2013 at 02:42:07PM -0400, Petr Tsatsin wrote:
> > 1) I just tried to run some of my "old" parameter files using the new ET
> > release and I got some strange results. The parameter files which work
> > completely fine for previous releases do not work anymore in a sense that
> > for example for the binary neutron star simulations starting from LORENE
> > initial data hamiltonian constraint blows up and central density become
> nan
> > shortly after the beginning. Thus, I have a question are there any
> > essential changes I need to incorporate in my par files due to the new
> > release or the old par files should in principle work and give same
> results
> > as before?
>
> With these symptoms I would first look at the initial data setup itself.
> Are all past timelevels setup correctly?


What is the best way to check if past time levels are initialized properly?
I use the following parameters for the initial data:
InitBase::initial_data_setup_method = "init_some_levels"

ActiveThorns = "Meudon_Bin_NS"

ADMBase::initial_data            = "Meudon_Bin_NS"
ADMBase::initial_lapse           = "Meudon_Bin_NS"
ADMBase::initial_shift           = "Meudon_Bin_NS"
ADMBase::initial_dtlapse         = "Meudon_Bin_NS"
ADMBase::initial_dtshift         = "Meudon_Bin_NS"

Hydrobase::initial_hydro = "Meudon_Bin_NS"

Meudon_Bin_NS::filename = "path/to/file"



> In principle, the Lorene thorns
> should do that, but I could imagine tests not covering this. How does
> the data differ between an evolution using the old and the new release?
>

I'm attaching the figure with minimum lapse evolution. it can be seen that
lapse drops below 0.2 very quickly (several time steps).


>
> > 2) I'm trying to use ML_CCZ4 for the spacetime evolution  and I found the
> > example par file for BBH evolution in McLachlan/par/CCZ4/bbh_ccz4.par
> which
> > does not work. I figured that this file was for the old implementation of
> > the ccz4 inside ML_BSSN thorn and if I replace ML_BSSN with ML_CCZ4 and
> > comment some of the parameters it works. However, I was wondering if you
> > could provide a working example of such a file with ML_CCZ4?
>
> I am sorry, I cannot directly help with this. I opened a ticket, which
> might help others do it: https://trac.einsteintoolkit.org/ticket/1387
>
Thank you. It would be very helpful to have working examples.


>
> Frank
>
>


-- 
Petr Tsatsin
Graduate Student - Department of Physics
Charles E. Schmidt College of Science
Florida Atlantic University
(561)-297-3386
cell: 1-561-299-8048
ptsatin at fau.edu, ptsatsin at gmail.com
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