TY - JOUR
A1 - Frank, Jason
A1 - Moore, Brian E.
A1 - Reich, Sebastian
T1 - Linear PDEs and numerical methods that preserve a multisymplectic conservation law
N2 - Multisymplectic methods have recently been proposed as a generalization of symplectic ODE methods to the case of Hamiltonian PDEs. Their excellent long time behavior for a variety of Hamiltonian wave equations has been demonstrated in a number of numerical studies. A theoretical investigation and justification of multisymplectic methods is still largely missing. In this paper, we study linear multisymplectic PDEs and their discretization by means of numerical dispersion relations. It is found that multisymplectic methods in the sense of Bridges and Reich [Phys. Lett. A, 284 ( 2001), pp. 184-193] and Reich [J. Comput. Phys., 157 (2000), pp. 473-499], such as Gauss-Legendre Runge-Kutta methods, possess a number of desirable properties such as nonexistence of spurious roots and conservation of the sign of the group velocity. A certain CFL-type restriction on Delta t/Delta x might be required for methods higher than second order in time. It is also demonstrated by means of the explicit midpoint method that multistep methods may exhibit spurious roots in the numerical dispersion relation for any value of Delta t/Delta x despite being multisymplectic in the sense of discrete variational mechanics [J. E. Marsden, G. P. Patrick, and S. Shkoller, Commun. Math. Phys., 199 (1999), pp. 351-395]
Y1 - 2006
UR - http://epubs.siam.org/sisc/
U6 - http://dx.doi.org/10.1137/050628271
SN - 1064-8275
ER -
TY - JOUR
A1 - Bridges, Thomas J.
A1 - Reich, Sebastian
T1 - Numerical methods for Hamiltonian PDEs
N2 - The paper provides an introduction and survey of conservative discretization methods for Hamiltonian partial differential equations. The emphasis is on variational, symplectic and multi-symplectic methods. The derivation of methods as well as some of their fundamental geometric properties are discussed. Basic principles are illustrated by means of examples from wave and fluid dynamics
Y1 - 2006
UR - http://iopscience.iop.org/1751-8121/
U6 - http://dx.doi.org/10.1088/0305-4470/39/19/S02
SN - 0305-4470 - 39 (2006), 19, S
ER -