[Carpet] ReflectionSymmetry vs grid::domain="bitant"

[Erik Schnetter]

On Jun 9, 2006, at 09:02:46, Jonathan Thornburg wrote:

> Hi, Erik,
>
> As far as I can tell, there are 2 distinct ways to specify a z <--> -z
> reflection symmetry in Carpet: I can either specify grid::domain =  
> "bitant",
> (x)or I can activate thorn ReflectionSymmetry.  Do these both have the
> same semantics?  (In particular, does   grid::domain = "bitant"    
> still
> cause the symmetry BC to be applied if I schedule  ApplyBCs ?)

Yes, both have the same semantics.

> Are there any reasons to favor one way over the other (besides that
> ReflectionSymmetry is newer)?

ReflectionSymmetry is not public.  ReflectionSymmetry works correctly  
automatically once the tensor type has been declared for a grid  
function group; CartGrid3D requires run-time setup calls for the grid  
functions.  ReflectionSymmetry supports "symmetry interpolation",  
i.e., if you interpolate to a point on the other side of the mirror,  
you will get the correct result, while with CartGrid3D, you receive  
an "outside the domain" error.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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