Constraint preserving boundary conditions for the Ideal Newtonian MHD equations

CÉCERE, M. A.; LEHNER, L.; REULA, O.

COMPUTER PHYSICS COMMUNICATIONS

ELSEVIER SCIENCE BV

Año: 2008 vol. 179 p. 545 - 554

0010-4655

We study and develop constraint preserving boundary conditions for the Newtonian magnetohydrodynamic equations and analyze the behavior of the numerical solution upon considering different possible options. We concentrate on both the standard ideal MHD system and the one augmented by a "pseudo potential" to control the divergence free constraint. We show how the boundary conditions developed significantly reduce the violations generated at the boundaries at the numerical level and how lessen theirinfluence in the interior of the computational domain by making use of the available freedom in the equations.