DNS of Turbulent Premixed CO/H2/Air Flames

A program for the direct numerical simulation (DNS) of reactive flows is presented. In favor of using detailed models for chemical kinetics and molecular transport only spatially two-dimensional simulations are performed. This scientific application code has been used as a benchmark on several platforms, including Intel Itanium 2 systems, IBM’s SMP server pSeries 690, and a Fujitsu-Siemens hpc-Line cluster with Intel Xeon CPUs. The overhead for parallelization on these systems is discussed separately from the single processor performance. Up to 512 processor elements of a Cray T3E have been used and it is shown that even more processors could be used while maintaining a high parallel efficiency. Direct simulations of flames evolving after induced ignition of a premixed CO/H₂/air mixture under turbulent conditions have been carried out. Results of this investigation are presented in the application part of the paper.