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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 Reynolds decomposition ： ウィキペディア英語版 Reynolds decomposition In fluid dynamics and the theory of turbulence, Reynolds decomposition is a mathematical technique to separate the average and fluctuating parts of a quantity. For example, for a quantity $\backslash scriptstyle\; u$ the decomposition would be :$$ u(x,y,z,t) = \overline + u'(x,y,z,t) \, where $\backslash scriptstyle\backslash overline$ denotes the time average of $\backslash scriptstyle\; u\backslash ,$ (often called the steady component), and $u\text{'}\backslash ,$ the fluctuating part (or perturbations). The perturbations are defined such that their time average equals zero. This allows us to simplify the Navier–Stokes equations by substituting in the sum of the steady component and perturbations to the velocity profile and taking the mean value. The resulting equation contains a nonlinear term known as the Reynolds stresses which gives rise to turbulence. ==See also== *Reynolds-averaged Navier–Stokes equations *Turbulence 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「Reynolds decomposition」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.