Abstract
A newly developed fractal interaction by exchange with the mean (FIEM) subgrid mixing model is comparatively assessed against several other popular mixing models in the context of the large eddy simulation (LES) and filtered mass density function approaches. A novel multiscalar three-stream turbulent jet mixing problem, consisting of acetone-doped air surrounded by a pure ethylene stream issuing into an air coflow, is used for the assessment. LES predictions using the FIEM, IEM, Euclidean minimum spanning tree, and parametrized scalar profile mixing models are compared with experimental measurements of scalar mean and rms profiles and demonstrate that FIEM is in better agreement with the data than the other models for this case.
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