Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 33, Issue -, Pages 99-123Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2010.09.012
Keywords
Direct Numerical Simulation (DNS); Turbulent; Combustion Models; High-Performance Computing; Complex Chemistry
Funding
- Division of Chemical Sciences, Geosciences and Biosciences, the Office of Basic Energy Sciences, the US Department of Energy (DOE)
- Office of Science of the US DOE [DE-AC03-76SF00098, DE-AC05-00OR22725]
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The advent of petascale computing applied to direct numerical simulation (DNS) of turbulent combustion has transformed our ability to interrogate fine-grained 'turbulence-chemistry' interactions in canonical and laboratory configurations. In particular, three-dimensional DNS, at moderate Reynolds numbers and with complex chemistry, is providing unprecedented levels of detail to isolate and reveal fundamental causal relationships between turbulence, mixing and reaction. This information is leading to new physical insight, providing benchmark data for assessing model assumptions, suggesting new closure hypotheses, and providing interpretation of statistics obtained from lower-dimensional measurements. In this paper the various roles of petascale DNS are illustrated through selected examples related to lifted flame stabilization, premixed and stratified flame propagation in intense turbulence, and extinction and reignition in turbulent non-premixed jet flames. Extending the DNS envelope to higher Reynolds numbers, higher pressures, and greater chemical complexity will require exascale computing in the next decade. The future outlook of DNS in terms of challenges and opportunities in this regard are addressed. (C) 2010 Published by Elsevier Inc. on behalf of The Combustion Institute.
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