Density and viscosity differences may influence groundwater flow systems significantly, e.g., in coastal regions or when dealing with geothermal systems. FEFLOW provides a maximum of flexibility for these purposes:

• Density-dependent flow simulation
• Viscosity-dependent flow simulation
• Concentration-dependent density and viscosity
• Different influence of multiple chemical species on fluid density
• Temperature-dependent density and viscosity
• Editable relationships for density and viscosity