Large-Eddy Simulation of Turbulent Anisochoric Flows

摘要

The objective of this Ktudy is to develop a large eddy simulation model for nonrcacting as well as chemically reacting Hows at high Reynolds numbers. This paper focuses on the large eddy simulation model applied to the nonrendlng case and the evaluation of its predictive capabilities. Further, results from the large eddy simulations lire used to investigate the large-scale structures present in unsteady wake flows. The large eddy simulation model contains subgrid-seale models lor both cross and Reynolds quantities to account for both outscntter (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 thcAr-e model and the differential Reynolds stress model clearly reveals the known weaknesses of the latter methods.