Introduction

This thorn provides a generic method for registering routines to perform boundary conditions, and selecting variables to have these boundary conditions applied to them. In addition, it provides abstraction which allows all considerations of symmetry to be separated from those of physical boundary conditions. The general idea is that codes which use boundary conditions, be they physical or symmetry conditions, need not know anything about the thorns which provide them.

This thorn also contains some standard boundary conditions, most of which can be used with any spatial dimension and data type.