Multicomponent mass transport model: theory and numerical implementation (discrete-parcel-random-walk version)
The Multicomponent Mass Transfer (MMT) Model is a generic computer code, currently in its third generation, that was developed to predict the movement of radiocontaminants in the saturated and unsaturated sediments of the Hanford Site. This model was designed to use the water movement patterns produced by the unsaturated and saturated flow models coupled with dispersion and soil-waste reaction submodels to predict contaminant transport. This report documents the theorical foundation and the numerical solution procedure of the current (third) generation of the MMT Model. The present model simulates mass transport processes using an analog referred to as the Discrete-Parcel-Random-Walk (DPRW) algorithm. The basic concepts of this solution technique are described and the advantages and disadvantages of the DPRW scheme are discussed in relation to more conventional numerical techniques such as the finite-difference and finite-element methods. Verification of the numerical algorithm is demonstrated by comparing model results with known closed-form solutions. A brief error and sensitivity analysis of the algorithm with respect to numerical parameters is also presented. A simulation of the tritium plume beneath the Hanford Site is included to illustrate the use of the model in a typical application. 32 figs.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, Wash. (USA)
- DOE Contract Number:
- EY-76-C-06-1830
- OSTI ID:
- 7083383
- Report Number(s):
- BNWL-2127
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transport modeling in the environment using the discrete-parcel-random-walk approach
DCPT: A dual-continua random walk particle tracker fortransport
Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
510300* -- Environment
Terrestrial-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGORITHMS
AQUIFERS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COMPUTER CODES
ENVIRONMENTAL TRANSPORT
GROUND WATER
HANFORD RESERVATION
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MANAGEMENT
MASS TRANSFER
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
NATIONAL ORGANIZATIONS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
RADIOACTIVE WASTE DISPOSAL
RADIOISOTOPES
RADIONUCLIDE MIGRATION
SEDIMENTS
SIMULATION
TRITIUM
US ERDA
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
YEARS LIVING RADIOISOTOPES