Large-Eddy Simulation of a microburst (Articolo in rivista)

Type
Label
  • Large-Eddy Simulation of a microburst (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Anabor, V.; Rizza, U.; Nascimento, E. L.; Degrazia, G. A (2010)
    Large-Eddy Simulation of a microburst
    in Atmospheric chemistry and physics discussion
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Anabor, V.; Rizza, U.; Nascimento, E. L.; Degrazia, G. A (literal)
Pagina inizio
  • 9323 (literal)
Pagina fine
  • 9331 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 11 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Note
  • Google Scholar (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Anabor, V., Nascimento, E. L., and Degrazia, G. A - UFSM, Santa Maria, Brasil Rizza, U. - ISAC CNR (literal)
Titolo
  • Large-Eddy Simulation of a microburst (literal)
Abstract
  • The three-dimensional structure and evolution of an isolated and stationary microburst are simulated using a time-dependent, high resolution Large-Eddy-Simulation (LES) model. The microburst is initiated by specifying a simplified cooling source at the top of the domain around 2 km a.g.l. that leads to a strong downdraft. Surface winds of the order of 30 m s-1 were obtained over a region of 500 m radius around the central point of the impinging down- draft, with the simulated microburst lasting for a few min- utes. These characteristic length and time scales are consis- tent with results obtained from numerical simulations of mi- crobursts using cloud-resolving models. The simulated flow replicated some of the principal features of microbursts ob- served by Doppler radars: in particular, the horizontal spread of strong surface winds and a ring vortex at the leading edge of the cold outflow. In addition to the primary surface outflow, the simulation also generated a secondary surge of strong winds that appears to represent a pulsation in the mi- croburst evolution. These results highlight the capability of LES to reproduce complex phenomena like microbursts, indicating the poten- tial usage of LES models to represent atmospheric phenom- ena of time and space scales between the convective scale and the microscale. These include short-lived convectively- generated damaging winds. (literal)
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