Author(s)

C. Paniconi, S. Ferraris, M. Putti, G. Pini & G. Gambolati

Abstract

In this paper we describe the numerical code for a three-dimensional ground- water flow model. The model is developed for the case of variably saturated porous media, applicable to both the unsaturated (soil) zone and the saturated (groundwater) zone. The governing equation is nonlinear, and is linearized using either Picard or Newton iteration. The large sparse systems of linear equations generated by the finite element discretization are solved using efficient precon- ditioned conjugate gradient-like methods. Tetrahedral elements and linear basis functions are used for the discretization in space, and a weighted finite difference formula is used for the discretization in time. The code handles: temporally and s

Keywords