Direct Numerical Simulation of the Turbulent Ekman Layer: Turbulent Energy Budgets

摘要

Results from a direct numerical simulation of the Ekman layer at a Reynolds number of 400 were analyzed toncompute energy spectra and energy budgets for this flow. Turbulent kinetic energy spectra showevidence of isotropynat high wave numbers. Energy budgets indicated that the majority of the turbulent kinetic energy in the flow isnproduced by the coupling between the streamwise primary Reynolds shear stress and the streamwise velocityngradient. It was also found that the coupling of the vertical velocity variance with the spanwise directions allowsntransfer of kinetic energy by means of the return-to-isotropy pressure strain terms due to the splatting effect.