Direct numerical simulation of turbulent premixed flame interaction using parallel computing

Hong G. Im*, Jacqueline H. Chen, Ravishankar Subramanya, Raghurama Reddy

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Interaction of hydrogen-air premixed flames in homogeneous turbulent flow field is simulated employing Sandia's DNS code for compressible reacting flows. The computational methods include higher-order spatial discretization and time integration with an embedded error-monitoring scheme. A detailed hydrogen-air kinetic mechanism comprised of 9 species and 19 reversible steps is considered. MPI parallelism is implemented in the code, providing an excellent scalability for various hardware platforms up to 2048 processors. A two-dimensional domain with a physical size of 5.4 mm × 5.4 mm was computed, where a grid resolution of 750 2 points is used. Two cases of premixed flame interaction are considered: a lean-rich flame interaction between the flames of φ = 0.6 and 1.3, and an interaction of two identical rich premixed flames (φ = 2.0). In each case, the initial conditions were set such that the two premixed flames are placed in parallel and propagating towards each other. A superimposed initial turbulence flow field creates various degrees of flame corrugation during the interaction. The results show that the flame strength is intensified where the flame curvature is concave towards the fresh mixture. This trend is maintained even with the lean premixed flame at φ = 0.6, whose diffusive-thermal imbalance appears to be neutral due to the competing effects of the two fast-diffusing species, H 2 and H. The overall heat release is found to be monotonically increasing in time, due to the enhanced surface area as a result of turbulent straining and wrinkling. On the other hand, the overall consumption rate of reactants shows a nonmonotonic response during a "burn-out" of flame segments. Relative importance of the area increase versus enhanced local burning rate is also analyzed.

Original languageEnglish (US)
Title of host publicationProceedings of the 2001 National Heat Transfer Conference Volume 1
Pages879-884
Number of pages6
Volume1
StatePublished - 2001
Externally publishedYes
Event2001 National Heat Transfer Conference (NHTC2001) - Ananheim, CA, United States
Duration: Jun 10 2001Jun 12 2001

Other

Other2001 National Heat Transfer Conference (NHTC2001)
CountryUnited States
CityAnanheim, CA
Period06/10/0106/12/01

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Engineering (miscellaneous)

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