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3.0 PORFLOW Code <br />The PORFLOW code (ACRi 2000) was selected to perform the proposed fluid <br />and contaminant transport simulations for the SM -18 mine based on the following <br />criteria: <br />• Application to the multiphase contaminant transport problem at mining operation <br />• Model validation <br />• A history of applications similar to the model simulations to be performed at similar <br />facilities. <br />6 <br />SM -18 Mine Report <br />GeoScience Services <br />PORFLOW is a comprehensive mathematical model used for the simulation of <br />multi -phase fluid flow, heat transfer, and mass transport processes in variably saturated <br />porous and fractured media. The code can simulate transient or steady -state problems in <br />one, two, or three dimensions using either Cartesian or cylindrical geometry. The <br />geologic medium may be anisotropic and heterogeneous and may contain distinct <br />embedded elements such as discrete fractures or boreholes within a porous matrix. In <br />partially saturated zones, liquids and gases are assumed to co- exist. The degree of <br />saturation of each phase is determined at each grid node as part of the solution. The <br />dependent variable, or its change from the current state, approximates the flux terms. <br />Finally, several options are provided for the incorporation of sources or sinks of fluid, <br />heat, or mass. Fluid injection or withdrawal, sources or sinks of heat, or chemical species <br />may occur anywhere in the interior of the domain of interests. For chemical species, the <br />sources can be limited by their inventory, solubility, or both. <br />PORFLOW numerically solves a variable set of equations for general transport, <br />multi -phase pressure, temperature, and one or more chemical species. The method of <br />nodal point integration is used to integrate the governing differential equations by <br />temporal and spatial discretization over each control volume (element) of the physical <br />