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Large-eddy simulation of gas turbine combustors

The objective of this study is to develop tools to perform large-eddy simulation (LES) of turbulent flows in realistic engineering configurations. Of particular interest is the flow inside gas-turbine combustors. LES is an attractive approach for these flows, which are at relatively lower Reynolds numbers than external flows, and involve scalar mixing as a central component. This report discusses our progress towards developing a numerical algorithm and solver for this purpose. As outlined in last year’s report (Mahesh et al. Annual Research Briefs 1999), we have developed a conservative numerical algorithm that staggers the dependent variables to simulate incompressible flow on unstructured grids. Our report last year outlined the algorithm as well as some details of its implementation on parallel platforms. It was noted that the algorithm was applicable to hybrid elements, the data structures used compressed storage formats to reduce memory use, a grid reordering technique was developed, and validation simulations were just being initiated.