广州大学学报（自然科学版）
廣州大學學報（自然科學版）
엄주대학학보（자연과학판）
JOURNAL OF GUANGZHOU UNIVERSITY(NATURAL SCIENCE EDITION)
2014年
3期
60-67
,共8页
DSRFG%脉动风速谱%竖向相关性%大涡模拟%连续性条件
DSRFG%脈動風速譜%豎嚮相關性%大渦模擬%連續性條件
DSRFG%맥동풍속보%수향상관성%대와모의%련속성조건
DSRFG%power spectral of fluctuated wind speed%vertical spatial correlation%large eddy simula-tion%divergence-free condition
大涡模拟中入流边界条件脉动风速的处理对计算流体动力学的数值模拟结果的正确性和精度有着至关重要的影响，文章对在运用DSRFG法生成湍流脉动风的算法中，研究了几个相关参数（包括脉动风速能量谱离散化的区间样本数Kmax，能量谱密度模拟所选取三角级数向量组的个数N，空间尺度参数因子θ1和时间尺度参数因子θ2）的数值选取，对入流脉动风速功率谱和脉动风速竖向空间相关性模拟结果的影响。模拟计算结果表明：相对于其他3个参数，空间尺度参数因子θ1的选取相对比较离散。结合DSRFG算法和文章提出的最佳参数取值，模拟得到与实际大气风场特性吻合较好的冯卡门谱及其竖向相关特征。
大渦模擬中入流邊界條件脈動風速的處理對計算流體動力學的數值模擬結果的正確性和精度有著至關重要的影響，文章對在運用DSRFG法生成湍流脈動風的算法中，研究瞭幾箇相關參數（包括脈動風速能量譜離散化的區間樣本數Kmax，能量譜密度模擬所選取三角級數嚮量組的箇數N，空間呎度參數因子θ1和時間呎度參數因子θ2）的數值選取，對入流脈動風速功率譜和脈動風速豎嚮空間相關性模擬結果的影響。模擬計算結果錶明：相對于其他3箇參數，空間呎度參數因子θ1的選取相對比較離散。結閤DSRFG算法和文章提齣的最佳參數取值，模擬得到與實際大氣風場特性吻閤較好的馮卡門譜及其豎嚮相關特徵。
대와모의중입류변계조건맥동풍속적처리대계산류체동역학적수치모의결과적정학성화정도유착지관중요적영향，문장대재운용DSRFG법생성단류맥동풍적산법중，연구료궤개상관삼수（포괄맥동풍속능량보리산화적구간양본수Kmax，능량보밀도모의소선취삼각급수향량조적개수N，공간척도삼수인자θ1화시간척도삼수인자θ2）적수치선취，대입류맥동풍속공솔보화맥동풍속수향공간상관성모의결과적영향。모의계산결과표명：상대우기타3개삼수，공간척도삼수인자θ1적선취상대비교리산。결합DSRFG산법화문장제출적최가삼수취치，모의득도여실제대기풍장특성문합교호적풍잡문보급기수향상관특정。
The modeling of the inlet fluctuated wind velocity in large eddy simulation plays an important effect on the precision of computational fluid dynamics numerical simulation of wind loads on buildings .Along with the application of DSRFG method in turbulence wind velocity , the study on selecting the reasonable numerical val-ues of some main parameters in this method was conducted in this paper .These key parameters mainly include:the discretized sampling number for the simulated energy spectrum of fluctuated wind speed , the number of tri-angular function series in modeling the energy spectrum , the spatial and time scale parameter .The effect of these parameters on the simulated power spectrum and vertical spatial correlation of fluctuated wind speed were studied by an example of inlet fluctuated wind velocity simulation for the CFD application .Simulated results showed that the more scattered numerical values in spatial scale parameter were found to fit the empirical vertical spatial correlation of fluctuated wind speed .Finally a numerical simulation of inlet fluctuated wind velocity was conducted in this study through DSRFG method with the proposed values for these four parameters , and the sim-ulated results could represent the von-Karman spectrum and its vertical spatial correlation with considerable pre-cision.
