LES models for subgrid scalar transport are assessed through large eddy simulation of passive scalar mixing in a turbulent round jet. The simulation is performed on a spherical coordinate grid using semi-implicit time advancement. The models used to close the subgrid scalar flux term are varied while the same modeling approach is used for the momentum model in order to isolate the effects of the scalar modeling. The subgrid scalar flux models tested include an eddy diffusivity model and a one-parameter mixed model. Model performance is analyzed by examining mean resolved-scale quantities and PDFs of the scalar concentration field.

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