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FAQs
Q: Where do you get data from?
A: Boundary and initial conditions
are provided by a large mesoscale model such as WRF/MM5, RAMS, NCEP ETA
models. Boundary and initial conditions are also provided by local upper
air soundings.
Q: What are the difference between
A2Cflow and CFD models?
A: A2Cflow fuses seamlessly atmospheric
and CFD model capabilities. A2Cflow predicts microscale meteorological
variables more accurately than mesoscale or CFD models.
Q: What is a diagnostic flow model?
A: A diagnostic flow model obtains
wind distribtions by interporation of data with the mass conservation
constraint. A diagnostic model is simple and fast in computation and suitable
for analysis.
Q: What is a prognostic flow model?
A: A prognostic flow model forecasts
wind field based on a set of conservation equations such as for the mass,
momentum, internal energy, and kinetic energy of turbulence.
Ted's View
What is the future direction
of urban environmental modeling?
There are two approaches to modeling urban effects on airflows. One is an urban canopy parameterization and the other is computational fluid dynamics (CFD). The former is appropriate for a mesoscale atmospheric model where horizontal grid spacing is much larger than individual building size. The latter is useful to simulate airflows in detail around buildings.
Our model merges the mesoscale and CFD model capabilities by using nested domains. An urban canopy parameterization is used in the outer domains where horizontal grid spacing is large and the CFD approach is used in the inner domain where horizontal grid spacing is small enough to show airflows and wind tunnels around individual buildings.
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