[Users] Some quasion about parameter file

[彭兆宏]

Dear Ian

It works. Thanks for your helping.

Best,
Alan,

2017-03-13 21:09 GMT+08:00 Ian Hinder <ian.hinder at aei.mpg.de>:

>
> On 13 Mar 2017, at 04:55, 彭兆宏 <alanpeng1995 at gmail.com> wrote:
>
>
>
> Dear Ian,
>
> Sorry for the delay in replying your letter. The following attachment is
> my parameter file. I only changed the
>
> ReflectionSymmetry::reflection_z = "no",
> CarpetRegrid2::symmetry_rotating180 = "no",
> CoordBase::xmin = -120,
> CoordBase::zmin = -120,
> TwoPunctures::par_S_plus  [2] = 0.10000
> TwoPunctures::par_S_minus[0] = 0.10000
>
> Which parameters need to be changed when I used this setup?
>
>
> Hi Alan,
>
> When I run your parameter file, it gives the error
>
> ERROR from host c579.vc-a process 0
>   while executing schedule bin BoundaryConditions, routine
> RotatingSymmetry180::Rot180_ApplyBC
>   in thorn RotatingSymmetry180, file /home/ianhin/Cactus/
> EinsteinToolkitGit/arrangements/CactusNumerical/RotatingSymmetry180/src/
> rotatingsymmetry180.c:355:
>   -> The group "ML_BSSN::ML_LOG_CONFAC" has in the x-direction 63 symmetry
> points (grid points outside of the symmetry boundary).  This is not equal
> to the number of ghost zones, which is 3.  The number of symmetry points
> must be equal to the number of ghost zones.
>
> The problem is that you are running with the RotatingSymmetry180 thorn
> active, and it is trying to apply this symmetry.  RotatingSymmetry180
> behaves differently to ReflectionSymmetry.  ReflectionSymmetry has
> parameters to enable and disable the symmetry in the different directions,
> whereas RotatingSymmetry180 only supports a single symmetry direction (a
> rotation of 180 degrees about the z axis), and so does not have any similar
> parameters.  Activating the thorn is sufficient to activate the symmetry.
> Since you have
>
> CoordBase::xmin =-120.00
>
> it thinks that all the points between -120 and 0 are symmetry points,
> which is not correct, so it gives the error.
>
> The fix is to remove RotatingSymmetry180 from ActiveThorns on line 34.
> With this change, the parameter file runs for me.
>
> PS: May I give you some advice?  When asking for help to solve an unknown
> problem such as this, the speed and quality of the help you get back is
> directly related to how much information you provide.  For example, if you
> had sent the parameter file and the error message that you got with your
> original email, then someone familiar with the code would have seen the
> error message and realised that the problem was related to
> RotatingSymmetry180.  Since you were trying to run without that symmetry,
> they would have then told you to make sure it was not active.  They
> probably would not even have had to try to reproduce the problem.  I think
> you would have got the answer much more quickly that way.
>
> --
> Ian Hinder
> http://members.aei.mpg.de/ianhin
>
>
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