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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/87870


    Title: 紊流邊界層特性之數值模擬
    Other Titles: Numerical simulation of wind loads on atmospheric boundary layer
    Authors: 饒育昇;Jao, Yu-Sheng
    Contributors: 淡江大學土木工程學系碩士班
    鄭啟明;Cheng, Chii-Ming
    Keywords: 數值模擬;AR時間序列;大氣邊界層;Numerical Simulation;LES;boundary layer;Autoregressive
    Date: 2012
    Issue Date: 2013-04-13 11:49:27 (UTC+8)
    Abstract: 隨著科技發展、醫學進步,人口逐漸現象,但在有限的土地上求生活空間,所以建築
    物有向上發展的趨勢,加上政府近年來推動都市更新的計畫,都市中存在著越來越多的高
    層建築。
    因此我們若要探討紊流邊界層流場上的特性,勢必要進行風洞實驗的模擬。如果要進
    行一個真實地形的邊界層模擬,在製作該地形的縮尺模型上需要耗費大量的人力與時間。
    本研究希望能藉由計算流體力學(CFD)模擬出紊流邊界層特性。
    本研究主要是使用大渦模擬法(LES)去模擬風場中的大氣邊界層,對紊流邊界層的模擬
    結果會與風洞實驗室的實驗結果對照;探討方向部分為。
    首先,第一部份在模擬大氣邊界層風速剖面的風場,在本研究入流口給予淡江大學風
    洞實驗室邊界層數據,即給予平均風速(mean velocity)、紊流能量(turb_kinetic_e)、
    紊流消散率(turb_dissipati),並將這些數據輸入Fluent 進行模擬大氣邊界層的紊流特
    性,此方法為Fluent 內置頻譜生成法。
    第二部份同樣的在本研究入流口給予淡江大學風洞實驗室邊界層數據,利用AR 時間序
    列模擬出不同高度的風速歷時,再使用User Define Functions (UDF)輸入模擬出大氣邊
    界層的紊流特性,此方法為AR 時間序列模擬頻譜合成法。
    兩種方法在分析模擬上都在地面給予表面剪應力當作在風洞實驗室在地面的粗糙元
    素,在距離上游入流32D 的位置會是我們放置建築物的位置,而模擬出來的風場能吻合實
    驗室的紊流邊界層特性。
    This study is the characteristics of the turbulent boundary layer flow field were
    simulated by large-eddy simulation method. The simulation results of atmospheric
    turbulent boundary where compare with those of wind-tunnel test.There are second parts
    would be study.
    First, a velocity profiles in the simulated atmospheric boundary layer
    wind field in the inflow port of this study give Tamkang University wind
    tunnel boundary layer data, giving the average wind speed (mean Velocity)
    turbulence energy (turb_kinetic_e,), the turbulent dissipation rate
    (turb_dissipati), and data input Fluent to simulate the atmospheric boundary
    layer turbulence characteristics. This method for the synthesis Fluent
    internal spectrum.
    Second,a part of the inflow port of this study give the same Tamkang
    University wind tunnel boundary layer data, the use of AR time series to
    simulate the different heights of wind speed lasted, and then use the User
    Define Functions (UDF) input to simulate the atmospheric boundary layer
    tangledThe flow characteristics of this spectrum synthesis method for AR time
    series simulation.
    Two methods in the analysis of simulation are given in the ground surface
    shear stress as in the rough elements of the wind tunnel laboratory on the
    ground. We assume place the location of the buildings at a distance upstream
    inflow 32D,simulation of wind field can effectively consistent with
    laboratory turbulent boundary layer characteristics
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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