Application of the E-ε turbulence model to the atmospheric boundary layer

In the E- epsilon turbulence model, an eddy viscosity is evaluated from turbulent kinetic energy E and energy dissipation epsilon . Although still a first-order closure method in its simpler form, the E- epsilon model yields eddy viscosity for complex turbulent flows without a prior prescription of a length scale needed in mixing-length models. The E- epsilon model has been successfully applied to many flow problems in engineering applications for nonrotating boundary layers. The E- epsilon method is extended to the atmospheric boundary layer for which a modification of the dissipation equation is found to be necessary to give results comparable with observational data.