FEFLOW

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FEFLOW, which stands for Finite Element subsurface FLOW simulation system, addresses governing flow, mass, and heat transport equations in porous and fractured media using a multidimensional finite element method. It caters to complex geometric and parametric scenarios, including variable fluid density, saturation, free surfaces, multispecies reaction kinetics, non-isothermal flow, and multidiffusive effects. Drawing on 40 years of theoretical work, modeling experiences, and simulation practice, this book aims to share its extensive modeling knowledge with readers. It equips modeling practitioners and scientists with advanced theoretical and numerical methods. The content begins with a general theory for relevant flow and transport phenomena based on the continuum approach and systematically develops a framework for key problem classes, such as multiphase/multispecies non-isothermal flow and transport, discrete features, aquifer-averaged equations, and geothermal processes. It introduces finite-element techniques for solving basic balance equations, discusses advanced numerical algorithms for nonlinear and linear problems, and concludes with benchmarks, applications, and exercises to illustrate various problem types and effective solutions, including flow and seepage issues, unsaturated-saturated flow, advective-diffusion transport, saltwater intrusion, and geothermal flow.