Large-Eddy Simulation of Turbulent Anisochoric Flows

The objective of this study is to develop a large eddy simulation model for nonreacting as well as chemically reacting flows at high Reynolds numbers. This paper focuses on the large eddy simulation model applied to the nonreacting case and the evaluation of its predictive capabilities. Further, results from the large eddy simulations are used to investigate the large-scale structures present in unsteady wake flows. The large eddy simulation model contains subgrid-scale models for both cross and Reynolds quantities to account for both outscatter (i.e., transfer from small scales to larger scales) transfer between large scales and dissipation. To evaluate the large eddy simulation model, results from two- and three-dimensional large eddy simulations of nonreacting flow in a rectilinear channel with a triangular shaped bluff body are compared with experimental measurements and with results from two-dimensional simulations made with the k-e model and a differential Reynolds stress model. The investigations indicate that the results obtained with the large eddy simulation model is in good agreement with experimental data. Comparison of results obtained with the large eddy simulation model and results obtained with the k-e model and the differential Reynolds stress model clearly reveals the known weaknesses of the latter methods.

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