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@@ -0,0 +1,56 @@ +Cactus Code Thorn Boundary +Authors : Gabrielle Allen, Gerd Lanfermann +Managed by : ... <cactusmaint@cactuscode.org> +Version : 1 +CVS info : $Header$ +-------------------------------------------------------------------------- + +1. Purpose of the thorn + +This thorn provides some standard outer boundary conditions. + +Currently: + + - flat boundary conditions (a copy of the point just inside the + boundary) + + - radiation boundary conditions + +2. Dependencies of the thorn + +This thorn additionally requires: + +implementations: + driver +thorns: + CartGrid3D (needs to get at a GH extension) + +3. Thorn distribution + +This thorn is publically available + +4. Additional information + +This thorn only currently works with a 3D Cartesian Grid +The boundary conditions can be called from Fortran or C, +and can be passed either groups of grid functions, or single +grid variables. +The flat boundary conditions work with any size stencil width, +the radiation boundary conditions only currently work with +a stencil width of one. + +To apply a flat boundary condition from Fortran + + call ApplyFlatBC(cctkGH,sw,"imp::group_or_var") + +to apply a radiative boundary condition from Fortran + + call ApplyRadiativeBC(cctkGH,num,sw,"imp::group_or_var","imp::group_or_var2") + +Where: + stencil width is a dimension 3 integer array containing the stencil + width in each direction + num is a coefficient in the implemented radiative boundary condition + that is usually one. + +See the documentation for more details. |