The CFD model Fluidyn-Panache was configured to model atmospheric transport from an area source. Modelled flow and turbulence were evaluated by comparison with on-site meteorological measurements, whilst atmospheric dispersion was compared with wind tunnel measurements. The results showed that higher rates of vertical and lateral dispersion were modelled than were determined in the wind tunnel, though modelled and measured ground-level centreline concentration data were within a factor of two. Uncertainties in wind tunnel and numerical modelling were highest close to the source. Consideration of fine-scale features was only necessary for receptors in the immediate near-field
SummaryThe forces due to normal pressure have been measured in
the region of the junction between a rear-loaded
wing swept forward at 28°, and a flat plate on which
a turbulent boundary layer had developed. The
Reynolds number was 1·03 × 106, based on
the streamwise wing-chord of 500 mm. At low
incidences, 0° < α ≤ 6°, the
local pressure drag coefficients were found to be
negativeaway from the junction,
and the interaction with the junction was found to
be favourable;that is the pressure
drag coefficient became more negative as the
junction was approached. At α = −3° the pressure
drag coefficient changed from a positive value away
from the junction to a negative value close to the
plate. These results contrast with those for a
swept-back wing-plate interaction, which has been
reported as being unfavourable so far as the
pressure drag was concerned. At 6° incidence, the
interaction remained favourable but there was
evidence of root stall beginning. At an incidence of
9°, root stall was much more marked and the positive
pressure drag coefficient increased as the junction
was approached.
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