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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Multiscale turbulence ： ウィキペディア英語版 Multiscale turbulence Multiscale turbulence is a class of turbulent flows in which the chaotic motion of the fluid is forced at different length and/or time scales. This is usually achieved by immersing in a moving fluid a body with a multiscale, often fractal-like, arrangement of length scales. This arrangement of scales can be either passive or active As turbulent flows contain eddies with a wide range of scales, exciting the turbulence at particular scales (or range of scales) allows one to fine-tune the properties of that flow. Multiscale turbulent flows have been successfully applied in different fields., such as: * Reducing acoustic noise from wings by modifying the geometry of spoilers;〔Nedić, J., B. Ganapathisubramani, J. C. Vassilicos, J. Boree, L. E. Brizzi, A. Spohn. ("Aeroacoustic performance of fractal spoilers" ). ''AIAA journal'' 2012.〕 * Enhancing heat transfer from impinging jets passing through grids; * Reducing the vortex shedding intensity of flows past normal plates without changing the shedding frequency; * Enhancing mixing by energy-efficient stirring; * Improving flow metering and flow conditioning in pipes; * Improving combustion. In 2013 the EU awarded a Marie Curie grant of 3.8M Euros for research and training of 13 young scientists and engineers in multiscale turbulence in order to further explore and apply the properties of these flows〔(【引用サイトリンク】accessdate=25 February 2015 )〕 Multiscale turbulence has also played an important role into probing the internal structure of turbulence. This sort of turbulence allowed researchers to unveil a novel dissipation law in which the parameter $C\_\backslash epsilon$ in : $\backslash varepsilon\; =\; C\_\backslash varepsilon\; \backslash frac$, with $m\; \backslash approx\; 1\; \backslash approx\; n$, where $Re\_I$ and $Re\_L$ are Reynolds numbers based, respectively, on initial/global conditions (such as free-stream velocity and the object's length scale) and local conditions (such as the rms velocity and integral length scale). This new dissipation law characterises non-equilibrium turbulence apparently universally in various flows (not just multiscale turbulence) and results from non-equilibrium unsteady energy cascade. This imbalance implies that new mean flow scalings exist for free shear turbulent flows, as already observed in axisymmetric wakes〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multiscale turbulence」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.