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

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Description

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 ... continued below

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6 p.

Creation Information

Moridis, G.J. April 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Moridis, G.J. Lawrence Berkeley Lab., CA (United States). Earth Sciences Div.

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Description

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.

Physical Description

6 p.

Notes

INIS; OSTI as DE95012332

Source

  • 1995 TOUGH workshop, Berkeley, CA (United States), 20-22 Mar 1995

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  • Other: DE95012332
  • Report No.: LBL--37066
  • Report No.: CONF-9503116--10
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/72891 | External Link
  • Office of Scientific & Technical Information Report Number: 72891
  • Archival Resource Key: ark:/67531/metadc710377

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Creation Date

  • April 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 5, 2016, 10:23 a.m.

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Moridis, G.J. A new set of direct and iterative solvers for the TOUGH2 family of codes, report, April 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc710377/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.