HR: 11:35h
AN: H32A-06    [Abstracts]
TI: Simulation of coupled flow, transport, and reaction in porous media by lattice Boltzmann method
AU: * Zhang, D
EM: donzhang@ou.edu
AF: University of Oklahoma, Mewbourne School of Petroleum and Geological Engineering, 100 E. Boyd, SEC T314, Norman, OK 73019 United States
AU: Kang, Q
EM: qkang@lanl.gov
AF: Los Alamos National Lab, MS T003, EES-6, Los Alamos, NM 87545 United States
AB: We develop lattice-Boltzmann models for simulating pore-scale fluid flow, solute transport, and chemical dissolution/deposition in porous media. The processes of advection, diffusion, and surface reactions, together with temporal geometrical changes in the pore space, are taken into account. The numerical results show that at high Peclet and Peclet-Damkohler numbers, wormholes are formed and permeability increases greatly due to the dissolution process. At low Peclet and high Peclet-Damkohler numbers, reactions mainly occur at the inlet boundary, resulting in the face dissolution and the slowest increase of the permeability in the dissolution process. At moderate Peclet and Peclet-Damkohler numbers, reactions are generally nonuniform, with more in the upstream and less in the downstream. At very small Peclet-Damkohler number, dissolution or precipitation is highly uniform, and these two processes can be approximately reversed by each other. We also develop methods for upscaling the transport and reaction systems at a pore-scale to a macroscopic level and investigate the conditions under which such upscaling can be done.
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
DE: 3230 Numerical solutions
DE: 1800 HYDROLOGY
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting