|
|||||
|
|
Estimation of the Lagrangian Velocity Structure Function Constant C0 by Large-Eddy Simulation |
|
| Authors: | Umberto Rizza Cristina Mangia Jonas C Carvalho Domenico Anfossi |
| Institution: | 1. Institute of Atmospheric Sciences and Climate, CNR-ISAC, Strada Provinciale Lecce-Monteroni, km 1.2, Section of Lecce, Lecce, Italy 2. Programa de Pós-Gradua??o em Engenharia, ULBRA, Universidade Luterana do Brasil, Canoas, RS, Brasil 3. Institute of Atmospheric Sciences and Climate, CNR-ISAC, Section of Torino, Italy |
| Abstract: | 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 |
| Keywords: | Lagrangian dispersion Lagrangian stochastic models Lagrangian velocity structure function Large-eddy simulations Planetary boundary layer |
| 本文献已被 SpringerLink 等数据库收录！ | |