Provided boundary conditions

Thorn Boundary also provides seven standard boundary conditions, which can be applied to one, two, or three dimensional grid variables. The boundary conditions available are

• Scalar
• Flat
• Radiation
• Copy
• Robin
• Static
• None

Registration for each of these can be switched off by setting any of the following parameters to ``no'' (each defaults to ``yes'')

• register_scalar
• register_flat
• register_radiation
• register_copy
• register_robin
• register_static
• register_none

This is useful if you have your own implementation of one of these boundary conditions, which you would like to use instead.