Colli, Matteo; Rasmussen, Roy; Thériault, Julie M.; Lanza, Luca G.; Baker, C. Bruce et Kochendorfer, John
(2015).
« An Improved Trajectory Model to Evaluate the Collection Performance of Snow Gauges ».
Journal of Applied Meteorology and Climatology, 54(8), pp. 1826-1836.
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Résumé
Recent studies have used numerical models to estimate the collection efficiency
of solid precipitation gauges when exposed to the wind, in both
shielded and unshielded configurations. The models used computational fluid
dynamics (CFD) simulations of the airflow pattern generated by the aerodynamic
response to the gauge/shield geometry. These are used as initial conditions
to perform Lagrangian tracking of solid precipitation particles. Validation
of the results against field observations yielded similarities in the overall
behavior, but the model output only approximately reproduced the dependence
of the experimental collection efficiency on wind speed. This paper
presents an improved snowflake trajectory modeling scheme due to the inclusion
of a dynamically-determined drag coefficient. The drag coefficient
was estimated using the local Reynolds number as derived from CFD simulations
within a time-independent Reynolds Averaged Navier-Stokes (RANS)
approach. The proposed dynamic model greatly improves the consistency of
results with the field observations recently obtained at the Marshall, CO Winter
Precipitation Testbed.
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