Knowledge Requirements

The correct implementation, setup, problem formulation, and interpretation of the results of TOUGHREACT requires knowledge of the basic equations of multiphase non-isothermal fluid flow and transport in geologic media and a basic understanding of the numerical solution of the equations that are used to describe these processes. In addition, the formulation of the geochemical problem requires familiarity with geochemical modeling and an in-depth understanding of the system that is being modeled and of the data used for input to the model. The model boundary conditions, time step length, convergence criteria, and grid properties are crucial elements for a realistic and accurate solution to a problem. The input files for flow parameters are based on TOUGH2 V2, with some extensions. However, TOUGH2 V2 input files can be used without modification. A comprehensive reference of TOUGH2 input formats along with illustrative sample problems are provided in the TOUGH2 user’s guide, Version 2.0 (Pruess et al., 1999). This information is essential for successful application of TOUGHREACT; it is not duplicated in the current TOUGHREACT manual.