Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006bolme.120...25r&link_type=abstract
Boundary-Layer Meteorology, Volume 120, Issue 1, pp.25-37
Physics
3
Lagrangian Dispersion, Lagrangian Stochastic Models, Lagrangian Velocity Structure Function, Large-Eddy Simulations, Planetary Boundary Layer
Scientific paper
The inertial subrange Kolmogorov constant C 0, which determines the effective turbulent diffusion in velocity space, plays an important role in the Lagrangian modelling of pollutants. A wide range of values of the constant are found in the literature, most of them determined at low Reynolds number and/or under different assumptions. Here we estimate the constant C 0 by tracking an ensemble of Lagrangian particles in a planetary boundary layer simulated with a large-eddy simulation model and analysing the Lagrangian velocity structure function in the inertial subrange. The advantage of this technique is that it easily allows Reynolds numbers to be achieved typical of convective turbulent flows. Our estimates of C 0 is C 0=4.3±0.3 consistent with values found in the literature
Anfossi Domenico
Carvalho Jonas C.
Mangia Cristina
Rizza Umberto
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