Software name: fdm3d_csem
Language: FORTRAN90
Principal Developer: Chester J Weiss (505-284-6347)
Sponsors: Natural Gas and Oil Technology Partnership (NGOTP), Sandia Laboratory Directed Research & Development (LDRD) Program
License: This software is covered by the LGPL license. By downloading this software you
are agreeing to the terms of this license.
Copyright (c) 2005, Sandia National Laboratories
All rights reserved.
Description: This FORTRAN90 software package (fdm3d_csem) computes the electromagentic response of fully
3D sub-seabed
geology to electromagnetic stimulation by an infinitesimal time-harmonic electric dipole suspended in the water
collumn above. Magnetic dipole sources are also supported for completeness. The solution methodology is based on the staggered grid finite difference technique orignially
described by Yee (1966) and later applied to geophysics by Newman and Alumbaugh (1996). Additional features
of fdm3d_csem include the following:
- Solution method is the two-term coupled recursive QMR method of Freund and Nachtigal (1994)
- The matrix action is computed "on the fly", avoiding unnecessary and costly storage of the coefficient matrix
- Grid artifacts are mitigated by applying a Gauss quadrature approximation of the linear system RHS
- Multiple dipole transmitters can be evaluated simultaneously, thus approximating a line source or transmitter array
- A C++ driver routine is included for cross-language integration
Download: fdm3d_csem
