MurfMd

A Multidimension, Multiregion Finite Element Subsurface Flow Model for Slightly Compressible, Variably Saturated Structured Subsurface Media

Introduction

The computer code MurfMd was originally developed by J. P. (Jack) Gwo and G.-T. (George) Yeh at the Pennsylvania Sate University. It is a multi-dimensional version of the original MURF model (Gwo et al., 1994b).  On the basis of the multiregion flow theory in subsurface media developed by Gwo et al. (1996), we present here a multidimension, multiregion finite element subsurface flow model MurfMd. The governing equations for the model and the various boundary conditions incorporated in the model are described in Gwo et al. (1994b). The numerical implementation of MURF, using a Galerkin finite element method, is briefly discussed in the report.  The mass transfer process in the model is assumed linear and steady.  In addition to its multi-dimensional implementation, MurfMd also accommodates various one-dimensional and three-dimensional elements such as line elements, tetrahedrons, pentahedrons, and hexahedrons.

MurfMd has been tested on various Unix workstations and PC platforms.  Applications of MurfMd to various subsurface flow and contaminant transport problems may be found in the literature (e.g., Gwo et al., 1994a, 1994b, 1995, 1996, 1998, 1999; Wilson et al., 1994, 1998).  OpenMP parallel directives are also implemented for parallel, high performance platforms such as IBM SP, Cray PVPs, and so on.  Executable binaries on PCs and a number of Unix workstations are available.  The input data guide is available online.  For a hard copy of the MURF report (Gwo et al., 1994), please contact Dr. J. P. Gwo.  Comments and bug reports are very much appreciated and should be directed to J. P. Gwo.

License

This software was produced under U.S. Government contract (DE-AC05-00OR22725) by the Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, for the U.S. Department of Energy. This software (including any documentation) is a public-domain research code. You have the non-exclusive right to use this software free of charge. You have the right to make modifications to the source code for your own use. This software has not yet been evaluated and cleared for commercialization. This software (or parts of it) is not intended for duplication or distribution to third parties without the permission of UT-Battelle, LLC.

Disclaimer

The user of this software accepts and uses it at his or her own risk. The authors do not make any expressed or implied warranty of any kind with regard to this software. Nor shall the authors be liable for incidental or consequential damages with or arising out of the furnishing, use, or performance of this software.
 
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User Data Input Guide

Seventeen data sets are required to complete a user input data file, as follows:

1. title.
2. Integer parameters.
3. Real parameters.
4. Printout control.
5. Material property.
6. Soil property.
7. Nodal coordinate.
8. Element connectivity.
9. Material type change.
10. Initial condition.
11. Boundary dimension and control.
12. Source and sink.
13. Varaible boundary (rainfall, evaporation, seepage, river).
14. Dirichlet boundary.
15. Cauchy boundary.
16. Neumann boundary.
17. End of Job.


Executable Binaries

Intel/Microsoft Windows 95/98/NT

References

Gwo, J. P., P. M. Jardine, G. V. Wilson, and G. T. Yeh. 1994a. Modeling small-scale physical non-equilibrium and large-scale preferential fluid and solute transport in a structured soil. In A. Peters, G. Wittum, B. Herrling, U. Meissner, C. A. Brebbia, W. G. Gray, and G. F. Pinder (eds.), Computational Methods in Water Resources X. p.465-472.

Gwo, J. P., P. M. Jardine, G. T. Yeh, and G. V. Wilson. 1994b. MURF User's Guide: A Finite Element Model of Multiple-Pore-Region Flow Through Variably Saturated Subsurface Media. ORNL/GWPO-011, Oak Ridge National Laboratory.

Wilson, G. V., P. M. Jardine, R. J. Luxmoore, and J. P. Gwo, Multi-region flow and transport in unsaturated soil. (In) S. G. Pandalai (ed.), Trends in Hydrology. Council of Scientific Information. Trvivandrum, India. p.279-290. 1994.

Gwo, J. P., P. M. Jardine, G. V. Wilson, and G. T. Yeh. 1995. A multiple-pore-region concept to modeling mass transfer in subsurface media. J. Hydrol. 164: 217-237.

Gwo, J. P., P. M. Jardine, G. V. Wilson, and G. T. Yeh. 1996. Using a multiregion model to study the effects of advective and diffusive mass transfer on local physical nonequilibrium and solute mobility in a structured soil. Water Resour. Res. 32: 561-570.

Gwo, J. P., R. O'Brien, and P. M. Jardine. 1998. Mass transfer in structured porous media: Embedding mesoscale structure and microscale hydrodynamics in a two-region model. J. Hydrol. 208: 204-222.

Wilson, G.V., J.P. Gwo, P.M. Jardine, and R.J. Luxmoore. 1998. Hydraulic and Physical Nonequilibrium Effects on Multiregion Flow and Transport. In H.M. Selim and L. Ma (eds.), Physical Nonequilibrium in Soils: Modeling and Application, p.37-61, Ann Arbor Press, Inc., Michigan.

Gwo, J. P., G. V. Wilson, P. M. Jardine, and E. F. D'Azevedo, 1999. Modeling subsurface contaminant reactions and transport at the watershed scale. In Corwin, D. L., K. Loague, and T. R. Ellsworth (eds.) Assessment of Non-Point Source Pollution in the Vadose Zone, American Geophysical Union, Washington D. C., p31-43.

This homepage is maintained by J.P. Jack Gwo. Last updated: 8/9/2000.