LANDFLOW: a 3D finite volume model of combined free and porous flow of water in contaminated land sites

Free and porous flow of water in lands often occurs in combination under di fferent physical circumstances. To model such configurations, open and poro us flow regions need to be studied independently and also to integrate them through well-posed mathematical formulations. This paper presents a comput ational investigation (modelling and simulation) on flow of water and conta minants' mobility in soil. The governing partial differential equations of the flow were discretised and reduced to algebraic forms by finite volume m ethod for simulation purposes. Dirichlet boundary conditions were used at t he inlet. For sidewalls, no slip conditions were imposed while for the oute r boundary, stress free boundary conditions were used.