LES PREDICTION OF ATMOSPHERIC FLOW UNDER STABLE STRATIFICATION

Abstract

Large-eddy simulation has been conducted for flows over real topography in stably stratified atmosphere based on the Boussinesq approximated LES equations of motion and temperature equation. The basic method is first applied to flows over ideal isolated three-dimensional hill and its capability and accuracy are examined. Reasonable agreement with experimental results is obtained with standard Smagorinsky type models for the both subgrid stress and subgrid heat flux. No explicit representation of the buoyancy effects on the subgrid stress was used. The results applied to the real topography over a mountainous region also appear plausible.