Solute transport MOTIF

Abstract motif is a three-dimensional finite-element code developed to simulate groundwater flow, heat transfer and solute transport in deformable fractured porous media. The code has been subjected to an extensive verification and updating programme since the onset of its development. In this paper, additional verification and validation works with an emphasis on thermo-hydro-mechanical processes are presented. The verification results are based on cases designed to verify thermo-hydro-mechanical coupling terms, and isothermal and non-isothermal consolidations. A number of validation case studies have been conducted on the code. Example results are repotted in this paper. 

Over the past two decades AECL has developed a three-dimensional code, MOTIF (Model Of Transport In Fractured/porous media), for detailed modelling of groundwater flow, heat transport, mechanical equilibrium and solute transport in a fractured rock mass. The initial development was completed in 1985 (Guvanasen 1985). Since then the code has undergone extensive updating, verification - comparison with known analytical or numerical solutions - and validation - comparison with experiments - (Chan et al. 2(XX)). In the latter document sixteen test cases were repotted to verify the code for groundwater flow, heat transfer and solute transport in fractured or porous rock. In this paper, additional verification and validation studies with an emphasis on thermo-hydromechanical (T-H-M) processes are presented. 

The MOTIF code is a three-dimensional finite-element code capable of simulating steady state or transient coupled/uncoupled variable-density, variable- saturation fluid flow, heat transport, and conservative or nonspecies radionuclide) transport in deformable fractured/ porous media. In the code, the porous medium component is represented by hexahedral elements, triangular prism elements, tetrahedral elements, quadrilateral planar elements, and lineal elements. Discrete fractures are represented by biplanar quadrilateral elements (for the equilibrium equation), and monoplanar quadrilateral elements (for flow and transport equations). 

The six verification tests presented in this paper, along with other verification tests presented in the cited literature, have established the ability of the MOTIF finite-element code to accurately solve the equations of groundwater flow, solute and heat transport, and coupled thermo-hydro-mechanical phenomena in porous media, or in fractured media that can be adequately characterized by equivalent porous media (EPM) elements or a combination of EPM and discrete fracture elements. 

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