Izvorni znanstveni članak
THE EFFECT OF WIND DIRECTION ON FLOW PAST SOUTH GEORGIA
H. Wells
; Met Office, FitzRoy Road, Exeter, EX1 3PB, United Kingdom
S. Webster
; Met Office, FitzRoy Road, Exeter, EX1 3PB, United Kingdom
A.N. Ross
; University of Leeds, Environment, School of Earth and Environment, Leeds, LS2 9JT, United Kingdom
A.R. Brown
; Met Office, FitzRoy Road, Exeter, EX1 3PB, United Kingdom
Sažetak
A series of simulations of idealized flows past South Georgia are conducted in order to investigate how the wind direction affects the airflow around a real mesoscale mountain. Our experiments build on the work of Petersen et al. (2003) who investigated the impact of upstream wind direction on flow around an idealized mountain designed to be a similar size to Greenland. However, our experiments differ from Petersen’s experiments in two key ways. Firstly, we use real, complex multi-scale orography rather than idealized, smooth orography. Secondly, our mountain is much smaller. Results indicate that the flow features are sensitive to the wind direction, with the flow most effectively blocked when the incident flow at a slight angle to the major axis of the orography. In contrast to Petersen’s experiments around symmetrical idealized orography the flow features are also sensitive to a 180° rotation
of the orography. However, the magnitude of the surface pressure force is relatively insensitive to this, varying by less than 10% when the orography is rotated by 180° from any initial orientation.
Ključne riječi
Drag; Flow blocking; Barrier Jet
Hrčak ID:
64510
URI
Datum izdavanja:
15.12.2005.
Posjeta: 573 *