I am trying to understand how adequate my LES simulation is, using Pope's prescription: finding a metric M, $$M = \frac{X_{resolved}}{X_{resolved}+X_{modeled}}$$ where typical discussions suggest that >80% should be the resolved component, or $$M > 0.8$$. The choice of X for my case is the kinetic energy, so : $$M = \frac{k_{resolved}}{k_{resolved}+k_{modeled}}$$ However, I am confused by two formulations for choice of the resolved component.