DSpace community: 風工程研究中心
https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/75393
從事風力工程與大氣環境學術領域裡,尖端知識的研究與開拓。並配合國內建設,針對營造、建築、都市規劃、環境保護及產業保險界的需求。The community's search engineSearch the Channels
https://tkuir.lib.tku.edu.tw/dspace/simple-search
Generation of Suburban Terrain Inflow Conditions for Large Eddy Simulations
https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/93177
title: Generation of Suburban Terrain Inflow Conditions for Large Eddy Simulations abstract: To generate the suitable atmospheric boundary layer inlet for large eddy simulation, one of the most important techniques of computational wind engineering, the MDSRFG (modified discretizing and synthesizing random flow generation) was selected to numerically generate the inhomogeneous and anisotropic turbulence boundary
layer in this paper. A weakly-compressible-flow method along with the large eddy simulation (LES) was utilized to reproduce the unsteady flow field. Parameters, such as mean wind speeds, turbulence intensities and turbulence integral scales from fully-developed turbulent boundary layer flow were provided by well-established
wind tunnel tests. Furthermore, coherence between any two fluctuating wind speeds was taken into account for a more compact simulation of inflow. It was indicated that the method works well as a suburban turbulence boundary layer generator by comparing the characteristics of mean wind speed profiles, turbulence intensity profiles and power spectra at the centerline of several positions along longitudinal direction from wind tunnel
tests.
<br>改良式隨機紊流產生法於紊流邊界層之模擬研究
https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/93175
title: 改良式隨機紊流產生法於紊流邊界層之模擬研究 abstract: 紊流邊界層之入流邊界模擬為計算風工程領域之重要課題,Huang(2010)提出先進的DSRFG(discretizing and synthesizing random flow generation)方法,建構適用於大渦模擬(LES)之入流紊流產生器,可輸入任意風速頻譜,並且滿足非等向性與空間相關性。Castro(2011)基於DSRFG方法進行修正研究,除維持原有特性與優點外,另提升空間相關因子的可調式性,並加入時間相關性因子,得到改良式隨機紊流產生法(modified discretizing and synthesizing random flow generation,MDSRFG),使得該紊流產生器的調適度更加提升。本研究數值模擬之紊流模型採用大渦模擬的方法,入流邊界條件由MDSRFG方法產生,以市郊地況(suburban terrain)之大氣邊界層參數設定入流面條件包含平均風速、紊流強度以及紊流積分長度尺度。此外,利用風洞實驗所量測之風場交相關與自相關分析結果,調適空間與時間相關性因子。最後檢視數值模擬結果之紊流強度沿主流向之變化,以及空間中紊流頻譜的特性,進而探討紊流產生器於大氣邊界層模擬的適用性以及範圍。
<br>