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• W2888229105 abstract "Low-dimensional dynamical systems are fruitful models for mixing in fluid and granular flows. We study a one-dimensional discontinuous dynamical system (termed cutting and shuffling of a line segment), and we present a comprehensive computational study of its finite-time mixing properties including the effect of diffusion. To explore a large parameter space, we introduce fit functions for two mixing metrics of choice: the number of cutting interfaces (a standard quantity in dynamical systems theory of interval exchange transformations) and a mixing norm (a more physical measure of mixing). We compute averages of the mixing metrics across different permutations (shuffling protocols), showing that the latter averages are a robust descriptor of mixing for any permutation choice. If the decay of the normalized mixing norm is plotted against the number of map iterations rescaled by the characteristic e-folding time, then universality emerges: mixing norm decay curves across all cutting and shuffling protocols collapse onto a single stretched-exponential profile. Next, we predict this critical number of iterations using the average length of unmixed subsegments of continuous color during cutting and shuffling and a Batchelor-scale-type diffusion argument. This prediction, called a stopping time for finite Markov chains, compares well with the e-folding time of the stretched-exponential fit. Finally, we quantify the effect of diffusion on cutting and shuffling through a P'eclet number (a dimensionless inverse diffusivity), showing that the system transitions more sharply from an unmixed initial state to a mixed final state as the P'eclet number becomes large. Our numerical investigation of cutting and shuffling of a line segment in the presence of diffusion thus present evidence for the latter phenomenon, known as a cut-off for finite Markov chains, in interval exchange maps." @default.
• W2888229105 created "2018-08-31" @default.
• W2888229105 creator A5020256818 @default.
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• W2888229105 date "2018-08-23" @default.
• W2888229105 modified "2023-09-23" @default.
• W2888229105 title "Cutting and shuffling with diffusion: Evidence for cut-offs in interval exchange maps" @default.
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• W2888229105 doi "https://doi.org/10.1103/physreve.98.022221" @default.
• W2888229105 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30253617" @default.
• W2888229105 hasPublicationYear "2018" @default.
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