FEFLOW can simulate single-species and reactive multi-species solute transport in groundwater and the unsaturated zone, including sorption and chemical reactions:

Decay and sorption

• Decay processes: 1st order decay or Michaelis-Menten reaction
• Equilibrium sorption: Henry, Freundlich, or Langmuir isotherm

Multi-species reactive transport

• Arbitrary number of chemical species
• Dissolved or sorbed species
• Definition of arbitrary kinetic reactions via equation editor

General mass-transport features

• Sophisticated upwind techniques
• Parameter fitting for the sorption isotherms in FE-LM² (included)
• Density-coupled modelling for concentration-dependent fluid density and fluid viscosity (e.g. for salt water intrusion problems)
• Simultaneous modeling of heat and (single- or multi-species) mass transport
• Forward or backward transport modeling (reversed flow field)
• Linear (Bear-Scheidegger) or nonlinear dispersion