Fine Scale Meteorology & Air Quality Models - School of Architecture ...
Fine Scale Meteorology & Air Quality Models - School of Architecture ...
Fine Scale Meteorology & Air Quality Models - School of Architecture ...
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ASI2_Lecture 3_7/12/2011<br />
WRF simulations over Madrid (1 km resolutión) 1200 UTC<br />
K H Smagorinsky Smagorinsky CONST: With K HO =600 m 2 /s (MM5 style)<br />
Temperature<br />
(2m)<br />
CONST<br />
Vertical velocities<br />
(250m)<br />
Vertical<br />
velocity<br />
ASI 2: URBAN CLIMATE AND AIR POLLUTION <strong>School</strong> <strong>of</strong> <strong>Architecture</strong>, The Chinese University <strong>of</strong> Hong Kong, Hong Kong, 7-8 Dec 2011<br />
Alternative methodology:<br />
In addition to filtering structures smaller than the grid cell, we also<br />
filter turbulent eddies smaller than the size <strong>of</strong> the most energetic<br />
eddies. Because we are running in RANS mode, all turbulence should<br />
be filtered out by the turbulence closure scheme. Martilli’s choice is<br />
to improve the treatment <strong>of</strong> the horizontal turbulent transport terms.<br />
u<br />
uu<br />
uv<br />
uw<br />
P<br />
uu<br />
uv<br />
uw<br />
<br />
t<br />
x<br />
y<br />
z<br />
x<br />
x<br />
y<br />
z<br />
Mean advection and pressure: resolved<br />
Can we still neglect these terms for high<br />
resolution (1km or less) runs<br />
Horizontal turbulent<br />
transport: neglected<br />
Vertical turbulent transport:<br />
parameterized<br />
Some ad hoc<br />
horizontal diffusion<br />
is <strong>of</strong>ten added<br />
Try to parameterize them: if they are not relevant they will show no impact on the<br />
ASI 2: URBAN CLIMATE AND AIR POLLUTION <strong>School</strong> results. <strong>of</strong> <strong>Architecture</strong>, The Chinese University <strong>of</strong> Hong Kong, Hong Kong, 7-8 Dec 2011<br />
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