Acta mathematica scientia,Series B ›› 2012, Vol. 32 ›› Issue (1): 129-154.doi: 10.1016/S0252-9602(12)60008-3

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HOMOGENIZATION, SYMMETRY, AND PERIODIZATION IN DIFFUSIVE RANDOM MEDIA

Alen Alexanderian1, Muruhan Rathinam2, Rouben Rostamian2   

  1. 1.Department of Mechanical Engineering, Johns Hopkins University Baltimore, MD 21218, USA|2.Department of Mathematics and Statistics, University of Maryland, Baltimore County Baltimore, MD 21250, USA
  • Received:2011-09-06 Online:2012-01-20 Published:2012-01-20
  • Contact: Rouben Rostamian,rostamian@umbc.edu E-mail:aalexa20@jhu.edu; muruhan@umbc.edu; rostamian@umbc.edu
  • Supported by:

    Research supported by the NSF grant DMS–0610013.

Abstract:

We present a systematic study of homogenization of diffusion in random me-dia with emphasis on tile-based random microstructures. We give detailed examples of several such media starting from their physical descriptions, then construct the associated probability spaces and verify their ergodicity. After a discussion of material symmetries of random media, we derive criteria for the isotropy of the homogenized limits in tile-based
structures. Furthermore, we study the periodization algorithm for the numerical approxi-mation of the homogenized diffusion tensor and study the algorithm’s rate of convergence. For one dimensional tile-based media, we prove a central limit result, giving a concrete rate of convergence for periodization. We also provide numerical evidence for a similar central limit behavior in the case of two dimensional tile-based structures.

Key words: homogenization, periodization, random media, ergodic dynamical systems, material symmetry, isotropy

CLC Number: 

  • 37A05
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