Summary
Three conservation laws are associated with the dynamics of Hamiltonian systems with symmetry: The total energy, the momentum map associated with the symmetry group, and the symplectic structure are invariant under the flow. Discrete time approximations of Hamiltonian flows typically do not share these properties unless specifically designed to do so. We develop explicit conservation conditions for a general class of algorithms on Lie groups. For the rigid body these conditions lead to a single-step algorithm that exactly preserves the energy, spatial momentum, and symplectic form. For homogeneous nonlinear elasticity, we find algorithms that conserve angular momentum and either the energy or the symplectic form.
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Communicated by Jerrold Marsden
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Lewis, D., Simo, J.C. Conserving algorithms for the dynamics of Hamiltonian systems on lie groups. J Nonlinear Sci 4, 253–299 (1994). https://doi.org/10.1007/BF02430634
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DOI: https://doi.org/10.1007/BF02430634