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LAGRANGIAN DISPERSION MODEL BASED ON ELLIPTIC RELAXATION IN THE ATMOSPHERIC BOUNDARY LAYER

Byunggu Kim
Department of Mechanical Engineering Yonsei University Shinchon-dong 134, Seodaemun-gu Seoul 120-749 Republic of Korea

Changhoon Lee
Department of Computational Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, Korea; Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, Korea

Аннотация

A new simple Lagrangian dispersion model for neutral atmospheric boundary layer is proposed. A version of the Generalized Langevin equation corresponding to the Isotropization of Production Reynolds stress model is applied to horizontally homogeneous equilibrium turbulent boundary layer. Constrains for the model constants are derived from the selfsimilarity condition of near-wall turbulence. The proposed model is tested for the prediction of dispersion due to a point source in two dimensions and compared with available experimental data and other well-known models.