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A parallel implementation of the TOUGH2 software package for large scale multiphase fluid and heat flow simulations
Umeå University, Faculty of Science and Technology, Department of Computing Science.
1999 (English)In: A Parallel Implementation of the TOUGH2 Software Package for Large Scale Multiphase Fluid and Heat Flow Simulations: Proceedings of the 1999 ACM/IEEE conference on Supercomputing, ACM/IEEE , 1999, 52-52 p.Conference paper (Refereed)
Abstract [en]

TOUGH2 is a widely used simulation package for solving groundwater flow related problems such as nuclear waste isolation, environmental remediation, and geothermal reservoir engineering. It solves a set of coupled mass and energy balance equations using a finite volume method. The parallel implementation first partitions the unstructured computational domain. For each time step, a set of coupled non-linear equations is solved with Newton iteration. In each Newton step, a Jacobian matrix is calculated and an ill-conditioned non-symmetric linear system is solved in parallel using a preconditioned iterative solver. Communication is required for convergence tests and data exchange across partitioning borders. A real problem with 17,584 blocks and 43,815 connections indicates good scalability properties. From 2 to 128 processors on Cray T3E, the solution time is reduced from 7984 to 126 seconds. Improved parallel performance is expected for larger problems with 105-106 blocks in a Yucca Mountain nuclear waste site study.

Place, publisher, year, edition, pages
ACM/IEEE , 1999. 52-52 p.
URN: urn:nbn:se:umu:diva-40429DOI: 10.1109/SC.1999.10002ISBN: 1-58113-091-0OAI: diva2:399638
ACM/IEEE conference on Supercomputing, November 13-November 18, Portland, Oregon, USA
Available from: 2011-02-23 Created: 2011-02-23 Last updated: 2011-02-28Bibliographically approved

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Elmroth, Erik
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