Transport on percolation clusters with power-law distributed bond strengths: when do blobs matter?

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Transport on percolation clusters with power-law distributed bond strengths: when do blobs matter? / Alava, M.; Moukarzel, C.

julkaisussa: Physical Review E, Vuosikerta 67, Nro 5, 056106, 2003, s. 1-8.

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Bibtex - Lataa

@article{d39c7b56f4ff4d0ea3ef59e458fede3a,
title = "Transport on percolation clusters with power-law distributed bond strengths: when do blobs matter?",
abstract = "The simplest transport problem, namely finding the maximum flow of current, or maxflow, is investigated on critical percolation clusters in two and three dimensions, using a combination of extremal statistics arguments and exact numerical computations, for power-law distributed bond strengths of the type P(σ)∼σ−α. Assuming that only cutting bonds determine the flow, the maxflow critical exponent v is found to be v(α)=(d−1)ν+1/(1−α). This prediction is confirmed with excellent accuracy using large-scale numerical simulation in two and three dimensions. However, in the region of anomalous bond capacity distributions (0<~α<~1) we demonstrate that, due to cluster-structure fluctuations, it is not the cutting bonds but the blobs that set the transport properties of the backbone. This “blob dominance” avoids a crossover to a regime where structural details, the distribution of the number of red or cutting bonds, would set the scaling. The restored scaling exponents, however, still follow the simplistic red bond estimate. This is argued to be due to the existence of a hierarchy of so-called minimum cut configurations, for which cutting bonds form the lowest level, and whose transport properties scale all in the same way. We point out the relevance of our findings to other scalar transport problems (i.e., conductivity).",
keywords = "percolation, transport, percolation, transport, percolation, transport",
author = "M. Alava and C. Moukarzel",
year = "2003",
doi = "10.1103/PhysRevE.67.056106",
language = "English",
volume = "67",
pages = "1--8",
journal = "Physical Review E",
issn = "2470-0045",
publisher = "American Physical Society",
number = "5",

}

RIS - Lataa

TY - JOUR

T1 - Transport on percolation clusters with power-law distributed bond strengths: when do blobs matter?

AU - Alava, M.

AU - Moukarzel, C.

PY - 2003

Y1 - 2003

N2 - The simplest transport problem, namely finding the maximum flow of current, or maxflow, is investigated on critical percolation clusters in two and three dimensions, using a combination of extremal statistics arguments and exact numerical computations, for power-law distributed bond strengths of the type P(σ)∼σ−α. Assuming that only cutting bonds determine the flow, the maxflow critical exponent v is found to be v(α)=(d−1)ν+1/(1−α). This prediction is confirmed with excellent accuracy using large-scale numerical simulation in two and three dimensions. However, in the region of anomalous bond capacity distributions (0<~α<~1) we demonstrate that, due to cluster-structure fluctuations, it is not the cutting bonds but the blobs that set the transport properties of the backbone. This “blob dominance” avoids a crossover to a regime where structural details, the distribution of the number of red or cutting bonds, would set the scaling. The restored scaling exponents, however, still follow the simplistic red bond estimate. This is argued to be due to the existence of a hierarchy of so-called minimum cut configurations, for which cutting bonds form the lowest level, and whose transport properties scale all in the same way. We point out the relevance of our findings to other scalar transport problems (i.e., conductivity).

AB - The simplest transport problem, namely finding the maximum flow of current, or maxflow, is investigated on critical percolation clusters in two and three dimensions, using a combination of extremal statistics arguments and exact numerical computations, for power-law distributed bond strengths of the type P(σ)∼σ−α. Assuming that only cutting bonds determine the flow, the maxflow critical exponent v is found to be v(α)=(d−1)ν+1/(1−α). This prediction is confirmed with excellent accuracy using large-scale numerical simulation in two and three dimensions. However, in the region of anomalous bond capacity distributions (0<~α<~1) we demonstrate that, due to cluster-structure fluctuations, it is not the cutting bonds but the blobs that set the transport properties of the backbone. This “blob dominance” avoids a crossover to a regime where structural details, the distribution of the number of red or cutting bonds, would set the scaling. The restored scaling exponents, however, still follow the simplistic red bond estimate. This is argued to be due to the existence of a hierarchy of so-called minimum cut configurations, for which cutting bonds form the lowest level, and whose transport properties scale all in the same way. We point out the relevance of our findings to other scalar transport problems (i.e., conductivity).

KW - percolation

KW - transport

KW - percolation

KW - transport

KW - percolation

KW - transport

U2 - 10.1103/PhysRevE.67.056106

DO - 10.1103/PhysRevE.67.056106

M3 - Article

VL - 67

SP - 1

EP - 8

JO - Physical Review E

JF - Physical Review E

SN - 2470-0045

IS - 5

M1 - 056106

ER -

ID: 3523532