A new set of direct and iterative solvers for the TOUGH2 family of codes

Technical Report · Sat Apr 01 00:00:00 EST 1995

DOI:https://doi.org/10.2172/72891· OSTI ID:72891

Moridis, G J ^[1]

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1. Lawrence Berkeley Lab., CA (United States). Earth Sciences Div.

Two new solvers are discussed. LUBAND, the first routine is a direct solver for banded systems and is based on a LU decomposition with partial pivoting and row interchange. BCGSTB, the second routine, is a Preconditioned Conjugate Gradient (PCG) solver with improved speed and convergence characteristics. Bandwidth minimization and gridblock ordering schemes are also introduced into TOUGH2 to improve speed and accuracy. TOUGH2 simulates fluid and heat flows in permeable media and is used for the evaluation of WIPP and TEVES (Thermal Enhanced Vapor Extraction System) that will be used to extract solvents from the Chemical Waste Landfill at Sandia National Laboratories.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 72891
• Report Number(s): LBL-37066; CONF-9503116-10; ON: DE95012332; TRN: AHC29519%%16
• Resource Relation: Conference: 1995 TOUGH workshop, Berkeley, CA (United States), 20-22 Mar 1995; Other Information: PBD: Apr 1995
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
05 NUCLEAR FUELS
54 ENVIRONMENTAL SCIENCES
POROUS MATERIALS
FLOW MODELS
WIPP
TWO-PHASE FLOW
HEAT TRANSFER
SANITARY LANDFILLS
T CODES
COMPUTERIZED SIMULATION
CALCULATION METHODS
L CODES
B CODES
RADIOACTIVE WASTE DISPOSAL
HIGH-LEVEL RADIOACTIVE WASTES
NUMERICAL SOLUTION
CHEMICAL WASTES
UNDERGROUND DISPOSAL
REMEDIAL ACTION
EXPERIMENTAL DATA