Lagrangian particle simulation of tracer dispersion in the lee of a schematic two-dimensional hill

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Journal of Applied Meteorology; (United States)

DOI:https://doi.org/10.1175/1520-0450(1994)033<0744:LPSOTD>2.0.CO;2· OSTI ID:6488116

Tinarelli, G; Anfossi, D; Brusasca, G; Ferrero, E; Giostra, U; Morselli, M G; Moussafir, J; Tampieri, F; Trombetti, F ^[1]

---

1. ENEL/CRAM Servizio Ambiente, Milan (Italy) CNR, Turin (Italy) Universita di Alessandria (Italy) CNR, Bologna (Italy) ARIA, Paris (France)

Spray, a 3D Langrangian particle model for the simulation of complex flow dispersion, is presented. Its performance is tested against the Environmental Protection Agency wind tunnel concentration distribution of passive tracer released from elevated point sources, located in the lee region of a two-dimensional schematic hill, in a neutrally stratified boundary layer. Based on the measured values of the first two moments of the turbulent flow velocity, the mean fields are computed over a regular grid using a mass-consistent model, whereas the turbulence structure is simply interpolated. From these fields, trajectories of tracer particles are computed using a linear formulation of the Langevin equation, with a correlated, skewed forcing. The self-consistence test (well-mixed condition), aimed at maintaining an initially well-mixed particle distribution uniform in time, has shown satisfactory results in the region under study. The computed concentration field turns out to be in good agreement with the observed one. In detail, ground-level profiles and vertical cross sections of concentration are compared showing the important effects resulting from the topographic influence on the flow structure.

• OSTI ID: 6488116
• Journal Information: Journal of Applied Meteorology; (United States), Journal Name: Journal of Applied Meteorology; (United States) Vol. 33:6; ISSN JOAMEZ; ISSN 0894-8763
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
540120 -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (1990-)
ATMOSPHERIC CIRCULATION
BOUNDARY LAYERS
COMPUTERIZED SIMULATION
EARTH ATMOSPHERE
LAYERS
SIMULATION
TURBULENCE