Abstract
Flow and multicomponent reactive transport in saturated/unsaturated porous media are modeled by ensembles of computational particles moving on regular lattices according to specific random walk rules. The occupation number of the lattice sites is updated with a global random walk (GRW) procedure which simulates the evolution of the ensemble with computational costs comparable to those for a single random walk simulation in sequential procedures. To cope with the nonlinearity and the degeneracy of the Richards equation the GRW flow solver uses linearization techniques similar to the L-scheme developed in finite element/volume approaches. Numerical schemes for reactive transport, coupled with the flow solver via numerical solutions for saturation and water flux, are implemented in splitting procedures. Diffusion-advection steps are solved by GRW algorithms using either biased or unbiased random walk probabilities. Since the number of particles in GRW simulations can be as large as the number of molecules involved in chemical reactions, one avoids the cumbersome problem of rescaling particle densities to approximate concentrations. Reaction steps are therefore formulated in terms of concentrations, as in deterministic approaches. The numerical convergence of the new schemes is demonstrated by comparisons with manufactured analytical solutions. Coupled flow and reactive transport problems of contaminant biodegradation described by the Monod model are further solved and the influence of flow nonlinearity/degeneracy and of the spatial heterogeneity of the medium is investigated numerically.
Authors
Nicolae Suciu
Mathematics Department, Friedrich-Alexander University of Erlangen-Nurnberg, Erlangen, Germany
Tiberiu Popoviciu Institute of Numerical Analysis, Romanian Academy, Cluj-Napoca, Romania
Florin A. Radu
Department of Mathematics, University of Bergen, Bergen, Norway
Keywords
Richards equation; Coupled flow and transport; Iterative schemes; Global random walk; Reactive flow; Monod model.
https://arxiv.org/pdf/2107.08745.pdf
Cite this paper as:
N. Suciu, F.A. Radu, Global random walk solvers for reactive transport and biodegradation processes in heterogeneous porous media, Adv. Water Res., 166 (2022), art. id. 104268, https://doi.org/10.1016/j.advwatres.2022.104268
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