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

Technical Report · Sat Apr 01 04:00:00 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 Lab., 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
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
42 ENGINEERING
54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS
B CODES
CALCULATION METHODS
CHEMICAL WASTES
COMPUTERIZED SIMULATION
EXPERIMENTAL DATA
FLOW MODELS
HEAT TRANSFER
HIGH-LEVEL RADIOACTIVE WASTES
L CODES
NUMERICAL SOLUTION
POROUS MATERIALS
RADIOACTIVE WASTE DISPOSAL
REMEDIAL ACTION
SANITARY LANDFILLS
T CODES
TWO-PHASE FLOW
UNDERGROUND DISPOSAL
WIPP