Environmental Engineering Reference
In-Depth Information
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4. Questions and Answers
Domenico Anfossi: Is there a difference in CPU time among the four models?
Answer: We did not check that aspect of the models because this type of model is
designed to run quickly. A single run for one tracer release on the JU2003
domain takes 1 or 2 min, at most, on a standard laptop.
R. Vautard: Since the flow is turbulent, don't you expect to have large scatter in
wind fields? Does scatter still exist in stable conditions?
Answer: The observed wind field is of course reflecting turbulent eddies of all
scales. The models all use the same inflow wind profile, which is assumed
constant during a given 15 min period. Any one model will give exactly the
same wind field solution each time that it is run with this wind input. The
differences between the four models' predicted wind fields is due to differences
in the way that each model parameterizes the recirculating wake geometries
and the logic used by that model to account for smaller wakes that intersect
larger wakes. Concerning stable conditions, our results for IOP08 are from a
nighttime period and show about the same amount of scatter as for the daytime
IOP02. In the downtown domain being studied, the stability is less than in the
upwind rural area due to the presence of mechanical mixing caused by the
buildings and also due to anthropogenic heat inputs.
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