The numerical irreversibility of the bidimensional billiard -768 particles- [L'irréversibilité numérique du billard bidimensionnel -768 particules-].




These simulations have a duration of 513 time steps. At t=0 just one particle starts moving (on the right-hand side and halfway up). Between t=256 and t=257, all velocities are reversed. The reversibility of the computations depends on the number of particles:


192 particles: reversibility.
336 particles: non reversibility.
768 particles: non reversibility.
1376 particles: non reversibility.



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