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Unformatted text preview: l random fields K(x,y) on 1 million node grids
The XIMUL code deals more generally with Bayesian estimation and conditional simulation of
1,2,3-D random functions of space or time [Ababou et al 1994]. The unconditional generator uses
the Fourier Turning Band method based on a representation theorem of Matheron (1973): see
[Tompson et al. 1989] and references therein. 4 Numerical solution with the BIGFLOW code Numerical simulations of seawater intrusion are carried out using the BigFlow code BF 2000
[Ababou and Trégarot 2002]. It solves a generalized model equation for flow in heterogeneous,
anisotropic, partially saturated media. It can efficiently follow multiple interacting free surfaces in
3D, and it can represent “open” or “macroporous” media [Trégarot 2000]. A vertically integrated 2D
flow module is also available, including Boussinesq-Dupuit aquifer flows, free surface hydraulics
based on kinematic-diffusive wave, Darcy-Forchheimer flow in rough fractures [Spiller 2004], and
the seawater intrusion module SWIM2D used here.
The BF 2000 code is based on implicit 3D finite volume formulation of flux divergence equations
in conservative form (mixed form). It solves fully coupled transient and steady flow problems, using
a single infinite time step for steady state. It uses Preconditioned Conjugate Gradients for matrix
solution, and modified Picard iterations f...
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