DC 欄位 | 值 | 語言 |
dc.contributor.author | 張能復 | zh_TW |
dc.creator | 張能復 | zh_TW |
dc.date | 2000-07-31 | zh_TW |
dc.date.accessioned | 2006-07-26T02:49:17Z | - |
dc.date.accessioned | 2018-06-28T23:19:03Z | - |
dc.date.available | 2006-07-26T02:49:17Z | - |
dc.date.available | 2018-06-28T23:19:03Z | - |
dc.date.issued | 2000-07-31 | - |
dc.identifier | 892211E002012 | en |
dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/22042 | - |
dc.description.abstract | 本研究的目的在於建立一個適用於台灣地區的
三維風場診斷模式。為了解決複雜地形對風場的影
響並同時滿足質量守恆的條件我們使用了變分分析
的技巧。在第一代變分分析中,因為對垂直風速分
量並無限制,風會選擇翻越地形而非繞流。這與空
氣污染事件發生時大氣密度成層的現象並不相符,
因此我們發展了第二代變分架構。然而,二代變分
法的統御方程式非常複雜,若使用一般常用的超鬆
弛法(Successive Over-Relaxation,SOR)求解,
收斂速率很慢,不具實用價值。本研究中,我們嘗
試以幾種不同的數值解法來求解,如強隱性法
(Strongly Implicit Procedure,SIP)、多重網
格法(Multigrid method)等等。我們發現在各種
方法中,以SIP 法求解最有率。尤其求解複雜地形
的風場時,SIP 法的優勢更明顯。 | zh_TW |
dc.description.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. | en |
dc.format | application/pdf | en |
dc.format.extent | 243311 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language | zh-TW | zh_TW |
dc.language.iso | zh_TW | zh_TW |
dc.publisher | 臺北市:國立臺灣大學環境工程學研究所 | zh_TW |
dc.rights | 國立臺灣大學環境工程學研究所 | zh_TW |
dc.subject | 風場 | zh_TW |
dc.subject | 地形 | zh_TW |
dc.subject | 診斷模式 | zh_TW |
dc.subject | 強隱性法(SIP) | zh_TW |
dc.subject | 多
重網格法 | zh_TW |
dc.subject | 鬆弛法(SOR) | zh_TW |
dc.subject | 變分分析 | zh_TW |
dc.subject | wind field | en |
dc.subject | terrain | en |
dc.subject | diagnostic model | en |
dc.subject | SIP | en |
dc.subject | Multi-Grid method | en |
dc.subject | SOR | en |
dc.subject | variational
analysis | en |
dc.title | 空氣污染物傳輸流場與軌跡的分析方法研究 | zh_TW |
dc.title | A Framework on Solving Wind Flow Field forAir Pollution
Transportation and Trajectory Analysis | en |
dc.type | report | en |
dc.identifier.uri.fulltext | http://ntur.lib.ntu.edu.tw/bitstream/246246/22042/1/892211E002012.pdf | - |
dc.coverage | 計畫年度:89
第一期;起迄日期:1999-08-01/2000-07-31 | zh_TW |
item.fulltext | with fulltext | - |
item.cerifentitytype | Publications | - |
item.openairetype | report | - |
item.languageiso639-1 | zh_TW | - |
item.openairecristype | http://purl.org/coar/resource_type/c_93fc | - |
item.grantfulltext | open | - |
顯示於: | 環境工程學研究所
|