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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 Görtler vortices ： ウィキペディア英語版 Görtler vortices In fluid dynamics, Görtler vortices are secondary flows that appear in a boundary layer flow along a concave wall. If the boundary layer is thin compared to the radius of curvature of the wall, the pressure remains constant across the boundary layer. On the other hand, if the boundary layer thickness is comparable to the radius of curvature, the centrifugal action creates a pressure variation across the boundary layer. This leads to the centrifugal instability (Görtler instability) of the boundary layer and consequent formation of Görtler vortices. ==Görtler number== The onset of Görtler vortices can be predicted using the dimensionless number called Görtler number (G). It is the ratio of centrifugal effects to the viscous effects in the boundary layer and is defined as :$$ \mathrm = \frac \left( \frac \right)^ where : $U\_e$ = external velocity : $\backslash theta$ = momentum thickness : $\backslash nu$ = kinematic viscosity : $R$ = radius of curvature of the wall Görtler instability occurs when G exceeds, about 0.3. 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「Görtler vortices」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.