Discussion
Which technique resolves the largest turbulent eddies explicitly?
Answer: D
Large eddy simulation resolves eddies larger than the grid and parameterises only the smaller ones, which is feasible for the boundary layer where the energy containing eddies are hundreds of metres across. Direct numerical simulation resolves everything but is limited to laboratory Reynolds numbers. Reynolds averaging parameterises the whole spectrum. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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