Direct Numerical Simulation plays a crucial role in the development of models, both by providing fundamental insight into the physics of turbulent combustion and by providing statistical information used to test and improve the parameterization of relevant physical processes.

Pittsburgh Supercomputing Center has been working with Sandia National Labs - Combustion Research Facility, to parallelize their DNS codes. The collaboration has resulted in the development of a parallel 2D DNS code (used to generate the graphics on this page) and a parallel 3D DNS code (currently in the beta-testing stage). Results of the collaboration are available here. Other work in progress, includes the development of a parallel version of a 3D Low Mach Number DNS Code and the optimization of part of the Chemkin libraries.

The cases highlighted here, study the flame-flame interaction in a turbulent flow field. Initial conditions for both cases are specified as a pair of hydrogen-air premixed flames superimposed on a turbulent flow field.

The following images and animations show the evolution of the flow field.

• Case 1 - Interaction of a strong flame with a weak flame.
• Case 2 - Interaction of two equal strength flames

The animations and images were rendered by Raghu Reddy and Ravi Subramanya (PSC) using Tecplot.

The following animation shows the evolution of the heat release contours in the flow-field.

animation by Raghu Reddy and Ravi Subramanya, PSC	Case 1: The evolution of the heat release contours in the flow-field. (mpeg - 0.24meg)
animation by Raghu Reddy and Ravi Subramanya, PSC	Case 1: The evolution of the temperature contours in the flow-field. (mpeg - 0.24meg)
animation by Raghu Reddy and Ravi Subramanya, PSC	Case 2: The evolution of the heat-release contours in the flow-field. (mpeg - 0.29meg)
animation by Raghu Reddy and Ravi Subramanya, PSC	Case 2: The evolution of the temperature contours in the flow-field. (mpeg - 0.29meg)

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