TY - GEN
T1 - Direct numerical simulation of turbulent premixed flame interaction using parallel computing
AU - Im, Hong G.
AU - Chen, Jacqueline H.
AU - Subramanya, Ravishankar
AU - Reddy, Raghurama
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0346905490&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0346905490
SN - 0791835332
SN - 9780791835333
T3 - Proceedings of the National Heat Transfer Conference
SP - 879
EP - 884
BT - Proceedings of the 2001 National Heat Transfer Conference Volume 1
T2 - 2001 National Heat Transfer Conference (NHTC2001)
Y2 - 10 June 2001 through 12 June 2001
ER -