STOMP Subsurface Transport Over Multiple Phases Version 2.0 Theory Guide
The U. S. Department of Energy, through the Office of Technology Development, has requested the demonstration of remediation technologies for the cleanup of volatile organic compounds and associated radionuclides within the soil and groundwater at arid sites. This demonstration program, called the VOC-Arid Soils Integrated Demonstration Program (Arid-ID), has been initially directed at a volume of unsaturated and saturated soil contaminated with carbon tetrachloride, on the Hanford Site near Richland, Washington. A principal subtask of the Arid-ID program involves the development of an integrated engineering simulator for evaluating the effectiveness and efficiency of various remediation technologies. The engineering simulator's intended users include scientists and engineers who are investigating subsurface phenomena associated with remediation technologies. Principal design goals for the engineer simulator include broad applicability, verified algorithms, quality assurance controls, and validated simulations against laboratory and field-scale experiments. An important goal for the simulator development subtask involves the ability to scale laboratory and field-scale experiments to full-scale remediation technologies, and to transfer acquired technology to other arid sites. The STOMP (Subsurface Transport Over Multiple Phases) simulator has been developed by the Pacific Northwest National Laboratory(a) for modeling remediation technologies. Information on the use, application, and theoretical basis of the STOMP simulator are documented in three companion guide manuals. This manual, the Theory Guide (Version 2.0), provides the most recent theory and discussions on the governing equations, constitutive relations, and numerical solution algorithms for the STOMP simulator. The STOMP simulator's fundamental purpose is to produce numerical predictions of thermal and hydrogeologic flow and transport phenomena in variably saturated subsurface environments, which are contaminated with volatile or nonvolatile organic compounds. Auxiliary applications include numerical predictions of solute transport processes including radioactive chain decay processes. Quantitative predictions from the STOMP simulator are generated from the numerical solution of partial differential equations that describe subsurface environment transport phenomena. Description of the contaminated subsurface environment is founded on governing conservation equations and constitutive functions. Governing coupled flow equations are partial differential equations for the conservation of water mass, air mass, (dissolved) organic compound mass and thermal energy. Equations for the conservation of salt or surfactant mass have also been included. Constitutive functions relate primary variables to secondary variables. Solution of the governing partial differential equations occurs by the integral volume finite difference method. The governing equations that describe thermal and hydrogeological flow processes are solved simultaneously using Newton-Raphson iteration to resolve the nonlinearities in the governing equations. Governing transport equations are partial differential equations for the conservation of solute mass. Solute mass conservation governing equations are solved sequentially, following the solution of the coupled flow equations, by a direct application of the integral volume finite difference method. The STOMP simulator is written in the FORTRAN 77 language, following American National Standards Institute (ANSI) standards. The simulator utilizes a variable source code configuration, which allows the execution memory and speed be tailored to the problem specifics, and essentially requires that the source code be assembled and compiled through a software maintenance utility.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC06-76RL01830
- OSTI ID:
- 1012234
- Report Number(s):
- PNNL-12030; TRN: US201110%%203
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALGORITHMS
CARBON TETRACHLORIDE
CONFIGURATION
DECAY
DEMONSTRATION PROGRAMS
EFFICIENCY
ENGINEERS
FINITE DIFFERENCE METHOD
FORTRAN
MAINTENANCE
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
PARTIAL DIFFERENTIAL EQUATIONS
QUALITY ASSURANCE
RADIOISOTOPES
SIMULATORS
SOILS
SOLUTES
SURFACTANTS
TRANSPORT