A Framework on Solving Wind Flow Field forAir Pollution Transportation and Trajectory Analysis
Date Issued
2000-07-31
Date
2000-07-31
Author(s)
張能復
DOI
892211E002012
Abstract
In this research, we tried to establish a
diagnostic wind field model to help solve the problem
about pollutant dispersion. We took the variational
analysis technique in order to let the wind field be
satisfied with the continuity equation. In the first
generation of variational analysis developed by
Chang(1983), there is no constraint on the vertical
wind vector so that the wind will cross over the terrain
rather than around the obstacle. This does not match
with the phenomenon that the air flow is a highly
stratified fluid, thus we developed the second
generation of variational analysis. Since the governing
equation of the second generation of variational
analysis is very complicated, the convergence rate isslow when using successive over-relaxation (SOR)
method to solve it.
In this research, we use seven different methods,
such as Strongly Implicit Procedure(SIP) ,Full
Multi-grid-method(FMG),Successive-OverRelaxation(S
OR)method, etc. ,to solve the governing equation of
second generation of varational analysis. After a series
of checking procedures, we have found that SIP
method is the most efficient one among these seven
methods. Especially when complex terrain is
considered, the superiority of SIP method is even more
significant. In the cases we have tested, the numerical
convergence rate of using SIP method is at least seven
times faster than SOR method.
Subjects
wind field
terrain
diagnostic model
SIP
Multi-Grid method
SOR
variational
analysis
analysis
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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