STOMP Subsurface Transport Over Multiple Phases Version 2.0 Theory Guide

Abstract

In writing this guide for the STOMP simulator, the authors have assumed that the reader comprehends concepts and theories associated with (multiple-phase) hydrology, heat transfer, thermodynamics, radioactive chain decay, and relative permeability-saturation-capillary pressure constitutive functions. The authors further assume that the reader is familiar with the computing environment on which they plan to compile and execute the STOMP simulator.The STOMP simulator requires an ANSI FORTRAN 77 compiler to generate an executable code. The memory requirements for executing the simulator are dependent on the complexity of physical system to be modeled and the size and dimensionality of the computational domain. Likewise execution speed depends on the problem complexity, size and dimensionality of the computational domain, and computer performance. One-dimensional problems of moderate complexity can be solved on conventional desktop computers, but multidimensional problems involving complex flow and transport phenomena typically require the power and memory capabilities of workstation or mainframe type computer systems.iii iv SummaryThe 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 fullscale 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 trans...

Carbon Tetrachloride Flow and Transport in the Subsurface of the 216-Z-18 Crib and 216-Z-1A Tile Field at the Hanford Site: Multifluid Flow Simulations and Conceptual Model Update

“…A complete overview of these relations can be found in White and Oostrom (2000). In this section, only the relations between relative permeability, fluid saturation, and capillary pressure (k-S-P) pertinent to the reported simulations are described.…”

Accelerating the spin-up of the coupled carbon and nitrogen cycle model in CLM4

“…The water content formulation itself has been previously shown to cause solution instability for soils near saturation (Hills et al, 1989). Instead of solving the soil water and groundwater separately, we use a flow model for variably saturated porous media, STOMP (Subsurface Transport Over Multiple Phases) (White and Oostrom, 2000), to see if it can resolve the oscillation in the total soil C.…”

SIMULATION FRAMEWORK FOR REGIONAL GEOLOGIC CO{sub 2} STORAGE ALONG ARCHES PROVINCE OF MIDWESTERN UNITED STATES

“…Information from the geocellular model was ported to a numerical model using geologic visualization software. The STOMP-CO2 simulator (White and Oostrom, 2000;White and Oostrom, 2006;and White et al, 2012) developed at Pacific Northwest National Laboratory was used for the simulations.…”

“…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 standards (White and Oostrom, 2000).…”