一個不舒服或不安全的環境風場會直接影響到建築物的使用與其周遭區域的規劃，有關風場環境的評估與改善措施，已成為世界各國大型建築物規劃設計時必須考量的要項之一。
本研究彙整了前人對於使用計算流體力學軟體(Computational Fluid Dynamics，簡稱為CFD)模擬行人風場使用準則的建議，來檢驗所採用之CFD模擬，再利用CFD模擬風流經障礙物後所產生的風速加速效應，而CFD模擬主要分成兩個部份。第一部份是使用CFD來模擬風經過山丘、山脊及懸崖，所產生之風速加速效應，藉由比較CFD結果與我國耐風設計規範（104）所提供的建議值，來檢驗所採用之CFD模擬；此外，還比較了使用不同k-ε model模擬後所得的結果，發現Realizable k-ε model在模擬靠近表面的迴流能力較Standard k-ε model來得好。第二部份則是以CFD模擬風經過一棟4:1:4建築後，所產生之風速加速效應，並與日本建築學會(Architectural Institute of Japan，簡稱AIJ)在網站上所提供之風洞試驗結果和Tominaga et.al.(2004)所使用CFD模擬的結果做比較，利用上述三者的比較結果，檢驗以CFD模擬預測環境風場之可行性。在4:1:4建築側邊的水平風速的模擬結果上，不同k-ε model模擬後所得的結果相似，且和風洞試驗結果相差甚遠，若在網格品質上有所提升，應可獲得更好的結果。

When building a huge structure, pedestrian level wind environment assessment becomes an important issue all over the world since an uncomfortable or unsafe pedestrian wind environment would directly affect the usability of building and the region around the building.
This study summarized the guidelines of using Computational Fluid Dynamic (CFD) to simulate Pedestrian level wind environment and then conducted simulations based on these guidelines to predict wind acceleration effects of the flow field around an obstacle.
First, this study carried out CFD simulations of flow around hill, ridge and escarpment and compared with the values specified in wind resistant design code (2015). The result showed that the Realizable k-ε model was more better then standard k-ε model in reproducing the reverse flow. Then, it also compared CFD results of flow around a 4:1:4 building with CFD results of Tominaga et al. (2004) and results from wind tunnel test. It’s very similar results by different k-ε models but different from wind tunnel test. It should improve the grid resolution then getting better result.

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