| SCALING EXPONENTS IN FULLY DEVELOPED ASYMMETRIC CHANNEL FLOW |
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| 作者姓名： | 蒋剑波 邱翔 卢志明 刘宇陆 |
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| 作者单位： | Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，P.R.China，Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，P.R.China，Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，P.R.China，Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，P.R.China |
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| 基金项目： | ProjectsupportedbytheNationalNaturalScienceFoundationofChina (Nos.1 0 2 72 0 71and1 0 472 0 63 ) |
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| 摘 要： | IntroductionDuetotheimportanceofglobalandlocalscalingexponents,theyattractmanyturbulentresearchersduringthepasttwentiesyears.Butresultsobtaineduptonowaremainlyonisotropicturbulence ,bothinexperimentsandnumericsimulations1].Itisfoundthatξpisnonlinearfunc…
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| 关 键 词： | 湍流逆向梯度传输 缩放指数 小波变换 数值仿真 非线性 |
| 收稿时间： | 2 September 2003 |
Scaling exponents in fully developed asymmetric channel flow |
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| Jiang Jian-bo,Qiu Xiang,Lu Zhi-ming,Liu Yu-lu Professor.SCALING EXPONENTS IN FULLY DEVELOPED ASYMMETRIC CHANNEL FLOW[J].Applied Mathematics and Mechanics(English Edition),2005,26(3):292-298. |
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| Authors: | Jiang Jian-bo Qiu Xiang Lu Zhi-ming Liu Yu-lu Professor |
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| Institution: | Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P.R. China |
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| Abstract: | Wavelet analysis is applied to study the global and local scaling exponents in fully developed asymmetric channel flow. Global exponents are calculated by orthogonal wavelets and Extended Scaling Similarity(ESS). The results show that the flow in an asymmetric channel flow exhibits different characteristics of intermittency from that in a symmetric flow. It is also shown that the intermittency property of the streamwise fluctuations is different from that of vertical fluctuations, and the intermittency does not decay with the increase of the distance from the wall. In addition, the Continuous Wavelet Transform(CWT) method is found to be unreliable to calculate the local scaling components. Finally, it is pointed out that the existence and the significance of negative local scaling components need further study. |
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| Keywords: | turbulent counter-gradient-transport(CGT) scaling exponent wavelet analysis |
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