caa a22 4500 469077514 CHVBK 20180323132939.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF02507609 doi (NATIONALLICENCE)springer-10.1007/BF02507609 Dispersion simulation of a wind tunnel experiment with Lagrangian particle models [Elektronische Daten] [D. Anfossi, E. Ferrero, G. Brusasca, G. Tinarelli, F. Tampieri, F. Trombetti, U. Giostra] Summary: A particle model LAMDA suitable for dealing with the atmospheric dispersion is presented. The reliability of the model is tested comparing the results of its simulations to the wind tunnel measurements by Khurshudyanet al. (1981). Two versions of the model, both based on the Langevin equation and askewed distribution of the vertical wind velocity fluctuations, are considered. To develop the second version of the model we derived a proper scheme to produce skewed distributions of particle velocities consistent with the observed first and second moments of turbulent fluctuating velocities, with their horizontal and vertical derivatives, and their cross-correlations. The 2D geometry of the obstacle (in the wind tunnel experiment considered) allowed some simplifications. Due to the lack of some input data (such as the vertical profiles of crosswind standard deviation of wind velocity fluctuations and of the Lagrangian time scales) we looked for three different parametrizations. It was found that particular combinations of measured and parametrized data could give rise to critical vertical regions in which the derived scheme for the generation of random vertical velocity fluctuations cannot be applied. The best vertical distributions of the Lagrangian time scales (third parametrization) were estimated by fitting simple formulations for the average plume height and lateral variances to the measured data. The main results of this work were the model performance in simulating dispersion in shear flow over flat terrain, and its sensivity to the shape of the crosscorrelation term $$\overline {u'w'} $$ . Società Italiana di Fisica, 1992 Meteorology nationallicence Anfossi D. Istituto di Cosmo-Geofisica del CNR, Torino aut Ferrero E. Istituto di Fisica Generale dell'Università, Torino aut Brusasca G. ENEL-CRTN Servizio Ambiente, Milano aut Tinarelli G. ENEL-CRTN Servizio Ambiente, Milano aut Tampieri F. Istituto FISBAT del CNR, Bologna aut Trombetti F. Istituto FISBAT del CNR, Bologna aut Giostra U. Istituto ISIATA del CNR, Lecce aut Il Nuovo Cimento C Kluwer Academic Publishers 15/2(1992-03-01), 139-158 0390-5551 15:2<139 1992 15 11543 https://doi.org/10.1007/BF02507609 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02507609 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Anfossi D. Istituto di Cosmo-Geofisica del CNR, Torino aut NATIONALLICENCE 700 1- Ferrero E. Istituto di Fisica Generale dell'Università, Torino aut NATIONALLICENCE 700 1- Brusasca G. ENEL-CRTN Servizio Ambiente, Milano aut NATIONALLICENCE 700 1- Tinarelli G. ENEL-CRTN Servizio Ambiente, Milano aut NATIONALLICENCE 700 1- Tampieri F. Istituto FISBAT del CNR, Bologna aut NATIONALLICENCE 700 1- Trombetti F. Istituto FISBAT del CNR, Bologna aut NATIONALLICENCE 700 1- Giostra U. Istituto ISIATA del CNR, Lecce aut NATIONALLICENCE 773 0- Il Nuovo Cimento C Kluwer Academic Publishers 15/2(1992-03-01), 139-158 0390-5551 15:2<139 1992 15 11543 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer