Highly stable explicit technique for stiff reaction-transport PDEs

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The numerical simulation of chemically reacting flows is a topic that has attracted a great deal of current research. At the heart of numerical reactive flow simulations are large sets of coupled, nonlinear partial differential equations (PDEs). Due to the stiffness that is usually present, explicit time differencing schemes are not used despite their inherent simplicity and efficiency on parallel and vector machines, since these schemes require prohibitively small numerical stepsizes. Implicit time differencing schemes, although possessing good stability characteristics, introduce a great deal of computational overhead necessary to solve the simultaneous algebraic system at each timestep. This paper proposes ... continued below

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11 pages; Other: FDE: PDF

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Aro, C. J., LLNL December 1, 1996.

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Description

The numerical simulation of chemically reacting flows is a topic that has attracted a great deal of current research. At the heart of numerical reactive flow simulations are large sets of coupled, nonlinear partial differential equations (PDEs). Due to the stiffness that is usually present, explicit time differencing schemes are not used despite their inherent simplicity and efficiency on parallel and vector machines, since these schemes require prohibitively small numerical stepsizes. Implicit time differencing schemes, although possessing good stability characteristics, introduce a great deal of computational overhead necessary to solve the simultaneous algebraic system at each timestep. This paper proposes an algorithm based on a preconditioned time differencing scheme. The algorithm is explicit and permits a large stable time step. A study of the algorithm's performance on a parallel architecture is presented.

Physical Description

11 pages; Other: FDE: PDF

Notes

OSTI as DE00016387

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  • 8th SIAM Conference on Parallel Processing for Scientific Computing, Minneapolis, MN (US), 03/14/1997--03/17/1997; Other Information: Supercedes report DE98051006; PBD: 01 Dec 96

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  • Other: DE98051006
  • Report No.: UCRL-JC-126371
  • Report No.: CONF-970342--
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 16387
  • Archival Resource Key: ark:/67531/metadc619308

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  • December 1, 1996

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 3, 2017, 12:40 p.m.

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Aro, C. J., LLNL. Highly stable explicit technique for stiff reaction-transport PDEs, article, December 1, 1996; (digital.library.unt.edu/ark:/67531/metadc619308/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.