Task 4 CFD of Transient 3D Mixing Process

The mixing quality is strongly influenced by the temporal as well as spatial distribution. Current CFD largely ignores transient phenomena and often the three-dimensional effects are not computed in most Reynolds Averaged Navier-Stokes (RANS) applications.

Status: Significant progress on LES was reported as a Poster at the Nov 1999 DoE ATS meeting held in Pittsburgh, PA. Graphic details are available in the Proceedings or from the above Author directly. Since then, we have modified the boundary conditions of the LES model at UC Berkeley to simulate the turbulent coannular pipe flow setup briefly described under Task 2, above. The setup attempts to obtain fully developed flow for both the fuel flow and the surrounding air flow. Comparisons between the experimental results from this setup and the LES model results have been performed. These comparisons have been submitted as a paper to the 29th International Symposium on Combustion to be held in Sapporo, Japan, July 21-26, 2002. This paper, giving details about the tomographic reconstruction and the LES results, is attached as Appendix A.

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