LARGE-EDDY SIMULATION OF TURBULENT ANISOCHORIC FLOWS

The objective of this study is to develop a large eddy simulation mode l for nonreacting as well as chemically reacting Rows at high Reynolds numbers. This paper focuses on the large eddy simulation model applie d to the nonreacting case and the evaluation of its predictive capabil ities. Further, results from the large eddy simulations are used to in vestigate the large-scale structures present in unsteady wake Rows. Th e large eddy simulation model contains subgrid-scale models for both c ross and Reynolds quantities to account for both outscatter (i.e., tra nsfer from small scales to larger scales) transfer between large scale s and dissipation. To evaluate the large eddy simulation model, result s from two and three-dimensional large eddy simulations of nonreacting flow ina rectilinear channel with a triangular shaped bluff body are compared with experimental measurements and with results from two-dime nsional simulations made with the k-epsilon model and a differential R eynolds stress model. The investigations indicate that the results obt ained with the large eddy simulation model is in good agreement with e xperimental data. Comparison of results obtained with the large eddy s imulation model and results obtained with the k-epsilon model and the differential Reynolds stress model clearly reveals the known weaknesse s of the latter methods.