FEHM

FEHM is a groundwater model that has been developed in the Earth and Environmental Sciences Division at Los Alamos National Laboratory over the past 30 years. The executable is available free at the FEHM Website. The capabilities of the code have expanded over the years to include multiphase flow of heat and mass with air, water, and CO2, methane hydrate, plus multi-component reactive chemistry and both thermal and mechanical stress. Applications of this code include simulations of: flow and transport in basin scale groundwater systems[1] , migration of environmental isotopes in the vadose zone,[2] geologic carbon sequestration,[3] oil shale extraction, geothermal energy,[4] migration of both nuclear and chemical contaminants,[5] methane hydrate formation,[6] seafloor hydrothermal circulation,[7] and formation of karst.[8] The simulator has been used to generate results for more than 100 peer reviewed publications which can be found at FEHM Publications.

Abstract

The Subsurface Flow and Transport Team at the Los Alamos National Laboratory (LANL) has been involved in large scale projects including performance assessment of Yucca Mountain, Environmental Remediation of the Nevada Test Site, the LANL Groundwater Protection Program and geologic CO2 sequestration. Subsurface physics has ranged from single fluid/single phase fluid flow when simulating basin scale groundwater aquifers to multi-fluid/multi-phase fluid flow when simulating the movement of air and water (with boiling and condensing) in the unsaturated zone surrounding a potential nuclear waste storage facility. These and other projects have motivated the development of software to assist in both scientific discovery and technical evaluation. LANL’s FEHM (Finite Element Heat and Mass) computer code simulates complex coupled subsurface processes as well flow in large and geologically complex basins. Its development has spanned several decades; a time over which the art and science of subsurface flow and transport simulation has dramatically evolved. For most early researchers, models were used primarily as tools for understanding subsurface processes. Subsequently, in addition to addressing purely scientific questions, models were used in technical evaluation roles. Advanced model analysis requires a detailed understanding of model errors (numerical dispersion and truncation) as well as those associated with the application (conceptual and calibration) Application errors are evaluated through exploration of model and parameter sensitivities and uncertainties. The development of FEHM has been motivated subsurface physics of applications and also by the requirements of model calibration, uncertainty quantification, and error analysis. FEHM possesses unique features and capabilities that are of general interest to the subsurface flow and transport community and it is well suited to hydrology, geothermal, petroleum reservoir applications, and CO2 sequestration.[9]

External links

More information on this versatile model can be found at:

See also

References

  1. ↑ Keating, H. Elizabeth; B.A. Robinson; V.V. Vesselinov (2005). "Development and application of numerical models to estimate fluxes through the regional aquifer beneath the Pajarito Plateau". Vadose Zone Journal. 4 (3): 653–671. doi:10.2136/vzj2004.0101.
  2. ↑ Kwicklis, M. Edward; A.V. Wolfsberg; P.H. Stauffer; M.A. Walvroord; M.J. Sully (2006). "Multiphase Multicomponent Parameter Estimation for Liquid and Vapor Fluxes in Deep Arid Systems Using Hydrologic Data and Natural Environmental Traces". Vadose Zone Journal. 5 (3): 934–950. doi:10.2136/vzj2006.0021.
  3. ↑ Stauffer, H. Philip; H.S Viswanathan; R.J. Pawar; G.D. Guthrie (2009). "A system model for geologic sequestration of carbon dioxide". Environmental Science Technology. 43 (3): 565–570. Bibcode:2009EnST...43..565S. doi:10.1021/es800403w. PMID 19244984.
  4. ↑ Tenma, Norio; T. Yamaguchi; G. Zyvoloski (2008). "The Hijiori Hot Dry Rock test site, Japan Evaluation and optimization of heat extraction from a two-layered reservoir". Geothermics. 37: 19–52. doi:10.1016/j.geothermics.2007.11.002.
  5. ↑ Robinson, A. Bruce; Viswanathan, HS; Valocchi, AJ. (2000). "Efficient numerical techniques for modeling multicomponent ground-water transport based upon simultaneous solution of strongly coupled subsets of chemical components". Advances in Water Resources. 23 (4): 307–324. Bibcode:2000AdWR...23..307R. doi:10.1016/S0309-1708(99)00034-2.
  6. ↑ Sakamoto, Y; T. Komai; T. Kawamura; H. Minagawa; N. Tenma; et al. (2007). "Modification of permeability model and history matching of laboratory-scale experiment for dissociation process of methane hydrate: Part 2 - Numerical study for estimation of permeability in methane hydrate reservoir". Int. J. Offshore Polar Eng.
  7. ↑ Hutnak, M; Fisher, AT; Zuhlsdorff, L; Spiess, V; Stauffer, PH; Gable, CW (2006). "Hydrothermal recharge and discharge guided by basement outcrops on 0.7-3.6 Ma seafloor east of the Juan de Fuca Ridge: Observations and numerical models". Geochemistry Geophysics Geosystems. 7 (7): Q07O02. Bibcode:2006GGG.....707O02H. doi:10.1029/2006GC001242.
  8. ↑ Chaudhuri A, Rajaram H, Viswanathan HS, Zyvoloski GA, Stauffer PH (2009). "Buoyant convection resulting from dissolution and permeabilitiy growth in vertical limestone fractures". Geophysical Research Letters. 36 (3): L03401. Bibcode:2009GeoRL..3603401C. doi:10.1029/2008GL036533.
  9. ↑ Zyvoloski, A. George (2007). FEHM: A control volume finite element code for simulating subsurface multi-phase multi-fluid heat and mass transfer (Report). Los Alamos Unclassified Report LA-UR-07-3359.
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