THE SENSITIVITY OF LARGE-EDDY SIMULATIONS OF TURBULENT SHEAR-FLOW TO SUBGRID MODELS

Previous large-eddy simulations of turbulent shear flows have shown si gnificant sensitivity to some aspects of the subgrid-scale turbulence models. In particular, Mason and Thomson (1999) demonstrated a marked improvement in simulations through the inclusion of stochastic stress variations in the subgrid model. Here a series of simulations is prese nted with a view to exploring the general sensitivity to such a subgri d model and in particular to the size and nature of the stochastic str ess variations. The model proposed by Mason and Thomson is found to be fairly satisfactory but some quantitative uncertainty remains.