Dear Erik,
Thank you for your respond. I want to use cylindrical coordinates in my problem (r, phi, z) and I think I need a physical boundary condition for phi ,rather than a symmetry. It seems rotational boundary condition can be helpful and I thought if I use periodic boundary condition for phi (namely , periodic_y = yes) the code should satisfy my demand . However, it could not.
Am I on the right track ? I think RotatingSymmetry90 cannot do that , because I want to have the full range [-PI, PI] and evolve it . All I need is connecting two ends of the grid in phi direction (or y) together . In other words, I like to tape -PI to PI.
Do you think the thorn Periodic is the appropriate thorn or there is a better thorn which can do that for me ?
Thank you Hassan
On Mon, Feb 28, 2011 at 5:37 PM, Erik Schnetter schnetter@cct.lsu.eduwrote:
Hassan
The current version of this thorn is located in an svn repository at http://svn.cactuscode.org/arrangements/CactusNumerical/Periodic. However, this thorn implements a toroidal symmetry, not a rotational symmetry. Can you describe the symmetry that you are trying to apply? For example, there is another thorn CactusNumerical/RotatingSymmetry90 that may be more suitable. There is also another thorn available that implements a Cartoon symmetry.
We describe much of our code at http://einsteintoolkit.org, and we use the mailing list users@einsteintoolkit.org for discussion. Would you mind using this mailing list instead of keeping this conversation private? The mailing list has the advantage that others will also be able to help when I don't know the answer.
-erik
On Mon, Feb 28, 2011 at 6:20 PM, halatae1@illinois.edu wrote:
Dear Dr. Schnetter,
I am Hassan Halataei, working in Professor Shapiro's Numerical Relativity
group in Univ. of Illinois at Urbana-Champaign. I am trying to use the thorn Periodic you have written in 2003 to implement rotational symmetry in my problem (Single Black hole surrounded by an accretion disk) . I read the 2-page documentary of the thorn and acted according to that . However, the thorn does not work for me . I tried several different things for days to make it work , however the result does not obey periodic boundary condition . I was wondering if you let me know if there is anything that I missed or any other consideration that I must take care of ?
Thank you Hassan
-- Erik Schnetter schnetter@cct.lsu.edu http://www.cct.lsu.edu/~eschnett/