Some of these utilize zonal methods and one, non-linear eddy viscosity relations. For velocity components, reasonable agreement is found between measurements and predictions . The turbulence models are found to give dramatically different turbulence intensities. These, in turn, give significant variations in the predicted temporal behaviour. Unlike, as suggested by measurements, predicted unsteady flow component amplitudes are found negligible relative to stochastic turbulent components.
Results suggest the former is excessively diffusive.
Overall, the zonal models show greatest accuracy.