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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 Turbulence kinetic energy ： ウィキペディア英語版 Turbulence kinetic energy In fluid dynamics, turbulence kinetic energy (TKE) is the mean kinetic energy per unit mass associated with eddies in turbulent flow. Physically, the turbulence kinetic energy is characterised by measured root-mean-square (RMS) velocity fluctuations. In Reynolds-averaged Navier Stokes equations, the turbulence kinetic energy can be calculated based on the closure method, i.e. a turbulence model. Generally, the TKE can be quantified by the mean of the turbulence normal stresses: :$k\; =\; \backslash frac12\; \backslash left(\; \backslash overline\; +\; \backslash overline\; +\; \backslash overline\; \backslash right).$ TKE can be produced by fluid shear, friction or buoyancy, or through external forcing at low-frequency eddie scales(integral scale). Turbulence kinetic energy is then transferred down the turbulence energy cascade, and is dissipated by viscous forces at the Kolmogorov scale. This process of production, transport and dissipation can be expressed as: :$\backslash frac\; +\; \backslash nabla\; \backslash cdot\; T\text{'}\; =\; P\; -\; \backslash epsilon,$ where:〔Pope, S. B., (2003) 'Turbulent Flows', Cambridge: Cambridge University Press〕 * $Dk/Dt$ is the mean-flow material derivative of TKE; * $\backslash nabla\; \backslash cdot\; T\text{'}$ is the turbulence transport of TKE; * $P$ is the production of TKE, and * $\backslash epsilon$ is the TKE dissipation. The full form of the TKE equation is :$$ \underbrace}_\\\text\end} + \underbrace}_\end} = - \underbrace \frac 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「Turbulence kinetic energy」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.