Geometric numerical integrators for Hunter-Saxton-like equations
This work provides a unified treatment of boundary conditions for these equations, which was previously unclear, benefiting researchers in numerical analysis and applied mathematics.
The authors develop novel geometric numerical integrators for Hunter-Saxton-like equations using multi-symplectic formulations and Hamiltonian structures, demonstrating favorable behavior in numerical experiments.
We present novel geometric numerical integrators for Hunter--Saxton-like equations by means of new multi-symplectic formulations and known Hamiltonian structures of the problems. We consider the Hunter--Saxton equation, the modified Hunter--Saxton equation, and the two-component Hunter--Saxton equation. Multi-symplectic discretisations based on these new formulations of the problems are exemplified by means of the explicit Euler box scheme, and Hamiltonian-preserving discretisations are exemplified by means of the discrete variational derivative method. We explain and justify the correct treatment of boundary conditions in a unified manner. This is necessary for a proper numerical implementation of these equations and was never explicitly clarified in the literature before, to the best of our knowledge. Finally, numerical experiments demonstrate the favourable behaviour of the proposed numerical integrators.