Validation on the mean friction velocity of an atmospheric boundary layer flow reproduced by large-eddy simulation in terms of kinetic energy conservation

Abstract

This study presents a validation of large-eddy simulation to reproduce normalized mean friction velocity in an atmospheric boundary layer flow in terms of kinetic energy conservation uncertainty. A primary finding of this study is that the normalised mean friction velocity of the atmospheric boundary layer is suggested to be insensitive to kinetic energy conservation errors. The present study approaches the sensitivity of the normalized friction velocity, which is one of the most fundamental statistics in the atmospheric boundary layer, to the uncertainty. The nearly complete conservation of kinetic energy in the present numerical framework is verified in an inviscid homogeneous isotropic fluctuation field. Then, the present analysis is applied to reproducing turbulent channel flows as direct numerical simulation and large-eddy simulation based on the previous studies before the present work analyses the present atmospheric boundary layer. The present analysis is then used to analyze the normalized friction velocity in the atmospheric boundary layer. The values of the friction velocity obtained in the previous study are in good agreement with that of the present study.