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Stretching field
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Stretching field : ウィキペディア英語版
Stretching field
In applied mathematics, stretching fields provide the local deformation of an infinitesimal circular fluid element over a finite time interval ∆''t''. The logarithm of the stretching (after first dividing by ∆''t'') gives the finite-time Lyapunov exponent λ for separation of nearby fluid elements at each point in a flow. For periodic two-dimensional flows, stretching fields have been shown to be closely related to the mixing of a passive scalar concentration field. Until recently, however, the extension of these ideas to systems that are non-periodic or weakly turbulent has been possible only in numerical simulations.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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