Open AccessEOS9nT: A TOUGH2 MODULE FOR THE SIMULATION OF FLOW AND SOLUTE/COLLOID TRANSPORT
Author(s) -
G.J. Moridis,
Yue Wu,
Karsten Pruess
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/778898
Subject(s) - colloid , advection , tracer , decoupling (probability) , convection–diffusion equation , flow (mathematics) , thermodynamics , mechanics , fluid dynamics , homogenization (climate) , chemistry , physics , biodiversity , ecology , control engineering , biology , nuclear physics , engineering
EOS9nT is a new TOUGH2 module for the simulation of flow and transport of an arbitrary number n of tracers (solutes and/or colloids) in the subsurface. The module first solves the flow-related equations, which are comprised of (a) the Richards equation and, depending on conditions, may also include (b) the flow equation of a dense brine or aqueous suspension and/or (c) the heat equation. A second set of transport equations, corresponding to the n tracers, are then solved sequentially. The low concentrations of the n tracers are considered to have no effect on the liquid phase, thus making possible the decoupling of their equations. The first set of equations in EOS9nT provides the flow regime and account for fluid density variations due to thermal and/or solute concentration effects. The n tracer transport equations account for sorption, radioactive decay, advection, hydrodynamic dispersion, molecular diffusion, as well as filtration (for colloids only). EOS9nT can handle gridblocks or irregular geometry in three-dimensional domains. Preliminary results from four 1-D verification problems show an excellent agreement between the numerical predictions and the known analytical solutions