WIAS Preprint No. 1374, (2008)

Stochastic flow simulation and particle transport in a 2D layer of random porous medium



Authors

  • Kurbanmuradov, Orazgeldi
  • Sabelfeld, Karl

2010 Mathematics Subject Classification

  • 65C05 65C20 76S05

2008 Physics and Astronomy Classification Scheme

  • 02.60.Cb, 02.70.Lq

Keywords

  • Darcy equation, random hydraulic conductivity, Randomized spectral models, diffusion regime, long-range correlations

Abstract

A stochastic numerical method is developed for simulation of flows and particle transport in a 2D layer of porous medium. The hydraulic conductivity is assumed to be a random field of a given statistical structure, the flow is modeled in the layer with prescribed boundary conditions. Numerical experiments are carried out by solving the Darcy equation for each sample of the hydraulic conductivity by a direct solver for sparse matrices, and tracking Lagrangian trajectories in the simulated flow. We present and analyze different Eulerian and Lagrangian statistical characteristics of the flow such as transverse and longitudinal velocity correlation functions, longitudinal dispersion coefficient, and the mean displacement of Lagrangian trajectories. We discuss the effect of long-range correlations of the longitudinal velocities which we have found in our numerical simulations. The related anomalous diffusion is also analyzed.

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