TY - JOUR
T1 - A Simple Parametrization for the Concentration Variance Dissipation in a Lagrangian Single-Particle Model
AU - Ferrero, Enrico
AU - Mortarini, Luca
AU - Purghè, Federico
N1 - Publisher Copyright:
© 2016, Springer Science+Business Media Dordrecht.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - A model for the evaluation of the concentration fluctuation variance is coupled with a one-particle Lagrangian stochastic model and results compared to a wind-tunnel simulation experiment. In this model the concentration variance evolves along the particle trajectories according to the same Langevin equation used for the simulation of the velocity field, and its dissipation is taken into account through a decay term with a finite time scale. Indeed, while the mean concentration is conserved, the concentration variance is not and our model takes into account its dissipation. A simple parametrization for the dissipation time scale is proposed and it is found that it depends linearly on time and on the ratio between the size and the height of the source through a scaling factor of 1 / 3.
AB - A model for the evaluation of the concentration fluctuation variance is coupled with a one-particle Lagrangian stochastic model and results compared to a wind-tunnel simulation experiment. In this model the concentration variance evolves along the particle trajectories according to the same Langevin equation used for the simulation of the velocity field, and its dissipation is taken into account through a decay term with a finite time scale. Indeed, while the mean concentration is conserved, the concentration variance is not and our model takes into account its dissipation. A simple parametrization for the dissipation time scale is proposed and it is found that it depends linearly on time and on the ratio between the size and the height of the source through a scaling factor of 1 / 3.
KW - Concentration fluctuations
KW - Concentration variance dissipation
KW - Lagrangian stochastic model
UR - http://www.scopus.com/inward/record.url?scp=85000443092&partnerID=8YFLogxK
U2 - 10.1007/s10546-016-0218-x
DO - 10.1007/s10546-016-0218-x
M3 - Article
SN - 0006-8314
VL - 163
SP - 91
EP - 101
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
IS - 1
ER -