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Persistent memory of diffusing particles

Suciu N, Vamo̧s C, Radu AF, Vereecken H, Knabner P (2009)

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Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2009

Journal

Publisher: American Physical Society

Book Volume: 80

Article Number: 061134

Journal Issue: 6

URI: https://www1.am.uni-erlangen.de/research/publications/Jahr_2009/2009_SuciuVamosRaduVereeckenKn_PersistMemoryOfDiffParticles

DOI: 10.1103/PhysRevE.80.061134

Abstract

The variance of the advection-diffusion processes with variable coefficients is exactly decomposed as a sum of dispersion terms and memory terms consisting of correlations between velocity and initial positions. For random initial conditions, the memory terms quantify the departure of the preasymptotic variance from the time-linear diffusive behavior. For deterministic initial conditions, the memory terms account for the memory of the initial positions of the diffusing particles. Numerical simulations based on a global random walk algorithm show that the influence of the initial distribution of the cloud of particles is felt over hundreds of dimensionless times. In case of diffusion in random velocity fields with finite correlation range the particles forget the initial positions in the long-time limit and the variance is self-averaging, with clear tendency toward normal diffusion. © 2009 The American Physical Society.

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How to cite

APA:

Suciu, N., Vamo̧s, C., Radu, A.F., Vereecken, H., & Knabner, P. (2009). Persistent memory of diffusing particles. Physical Review E, 80(6). https://doi.org/10.1103/PhysRevE.80.061134

MLA:

Suciu, Nicolae, et al. "Persistent memory of diffusing particles." Physical Review E 80.6 (2009).

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