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CVS info : $Header$
Cactus Code Thorn RotatingSymmetry90
Thorn Author(s) : Erik Schnetter <schnetter@aei.mpg.de>
Thorn Maintainer(s) : Erik Schnetter <schnetter@aei.mpg.de>
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Purpose of the thorn:
Provide a 90 degree rotational symmetry boundary condition. This is
the kind of symmetry that exists e.g. in a singl black hole evolution
when the black hole has spin. The same setup also admits an
additional bitant symmetry.
Currently the symmetry is fixed to be located at the lower x and y
boundaries, so that there is a rotation about the z axis.
The coordinate thorn does not know about this symmetry. You will have
to set up the domain such that you have an upper quadrant in the x and
y directions.
This symmetry boundary condition can be mixed with arbitrary symmetry
conditions in the z direction, e.g. bitant or periodicity.
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