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Scaling and Efficiency of PRISM in Adaptive Simulations of Turbulent Premixed Flames

By John B. Bell, Nancy J. Brown, Marcus S. Day, Michael Frenklach, Joseph F. Grcar, Richard M. Propp and Shaheen R. Tonse

Abstract

The dominant computational cost in modeling turbulent combustion phenomena numerically with high fidelity chemical mechanisms is the time required to solve the ordinary differential equations associated with chemical kinetics. One approach to reducing that computational cost is to develop an inexpensive surrogate model that accurately represents evolution of chemical kinetics. One such approach, PRISM, develops a polynomial representation of the chemistry evolution in a local region of chemical composition space. This representation is then stored for later use. As the computation proceeds, the chemistry evolution for other points within the same region are computed by evaluating these polynomials instead of calling an ordinary differential equation solver. If initial data for advancing the chemistry is encountered that is not in any region for which a polynomial is defined, the methodology dynamically samples that region and constructs a new representation for that region. The utility of ..

Year: 2007
OAI identifier: oai:CiteSeerX.psu:10.1.1.41.785
Provided by: CiteSeerX
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