PNNL

Abstract

Smoothed particle hydrodynamics model was used to simulate mineral precipitation resulting from the side-by-side injection of reacting solutions into two halves of a two-dimensional granular porous medium. Precipitation on grain surfaces occurred along a narrow zone in the middle of the domain, in which the reacting solutes mixed to generate a supersaturated solution of the reaction product. The new form of the homogeneous and heterogeneous reaction terms in the classical advection dispersion equation was proposed. This equation is based on the transport and mixing indices that account for non-uniform concentration distribution and highly localized reaction. The numerical simulations qualitatively reproduced the behavior observed in related laboratory experiments.