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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 stress ： ウィキペディア英語版 Reynolds stress In fluid dynamics, the Reynolds stress is the component of the total stress tensor in a fluid obtained from the averaging operation over the Navier-Stokes equations to account for turbulent fluctuations in fluid momentum. ==Definition== For a homogeneous fluid and an incompressible flow, the flow velocities are split into a mean part and a fluctuating part using Reynolds decomposition: :$u\_i\; =\; \backslash overline\; +\; u\_i\text{'},\backslash ,$ with $\backslash mathbf(\backslash mathbf,t)$ being the flow velocity vector having components $u\_i$ in the $x\_i$ coordinate direction (with $x\_i$ denoting the components of the coordinate vector $\backslash mathbf$). The mean velocities $\backslash overline$ are determined by either time averaging, spatial averaging or ensemble averaging, depending on the flow under study. Further $u\text{'}\_i$ denotes the fluctuating (turbulence) part of the velocity. The components ''τ''ij'' of the Reynolds stress tensor are defined as: :$\backslash tau\text{'}\_\; \backslash equiv\; \backslash rho\backslash ,\backslash overline,\backslash ,$ with ''ρ'' the fluid density, taken to be non-fluctuating for this homogeneous fluid. Another – often used – definition, for constant density, of the Reynolds stress components is: :$\backslash tau\text{'}\text{'}\_\; \backslash equiv\; \backslash overline,\backslash ,$ which has the dimensions of velocity squared, instead of stress. 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 stress」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.