Research of a neutral and stable boundary layer of the atmosphere using an explicit algebraic model of Reynolds stresses

Abstract

An explicit anisotropic algebraic model of the Reynolds stresses and the turbulent heat flux is tested in a neutrally stratified and stably stratified atmospheric boundary layer (ABL) over a homogeneous rough surface. To construct the algebraic model a three-parameter turbulence model is used, with the help of which the efficiency of eddy mixing of momentum in a neutrally stratified ABL and the efficiency of eddy mixing momentum and heat in a stable stratified atmospheric boundary layer is studied. The being version of the algebraic model is based on the physical principles of the RANS (Reynolds Average Navier Stokes) approximation for describing of stratified turbulence. The model includes the effect of gravitational waves, which allows taking into account the momentum maintenance under strong stability conditions. A comparison of the calculation results with the observational data and other numerical models available in the literature shows that the turbulence model is capable of reproducing the most important structural features for both the neutrally stratified ABL and stably stratified ABL and shows good agreement with the results of LES modeling.