A comparative study of the Mellor-Yamada and κ-εtwo-equation turbulence models in atmospheric application

摘要

The present study systematically compares the Mellor-Yamada (MY) model and the κ-εalgebraic stress model in order to verify the possibility of using the κ-εalgebraic stress model in atmospheric applications. The results of the parameterization process and atmospheric application of both models confirmed that the MY model neglected the pressure redistribution effect of buoyancy due to and and that of shear due to . In addition, the MY model overestimated the turbulent energy dissipation. Based on the formulation of the κ-εalgebraic stress model, we modified the constant value C_μ(=0.9) in the standard κ-εmodel to obtain the variables C_(μM) and C_(μH) to account for atmospheric stability. Finally, the results of the simulation obtained from the Wangara experiment verify the possibility of using the κ-εalgebraic stress model in atmospheric application.