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On the spatial structure of global linear instabilities and their experimental identification

机译:整体线性不稳定性的空间结构及其实验辨识

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The purpose of the present paper is to discuss the spatial structure of global instabilities, solutions of the partial derivative eigenvalue problem resulting from a nonparallel linear instability analysis of the incompressible Navier-Stokes and continuity equations, as developing upon four prototype essentially two- dimensional steady laminar flows. Theoretical knowledge of these eigendisturbances is instrumental to devising measurement techniques appropriate for their experimental recovery and ultimate control of laminar- turbulent transition mechanisms. Raising the awareness of the global linear flow eigenmodes contributes to redefining the boundaries between experimental observations which may be attributed to linear global as opposed to nonlinear mechanisms.
机译:本文的目的是讨论不可压缩的Navier-Stokes的非平行线性不稳定性分析和连续性方程所导致的偏微分特征值问题的解决方案,以及在四个基本为二维的稳态模型上的发展层流。这些本征干扰的理论知识有助于设计适合其实验恢复和层流湍流过渡机制最终控制的测量技术。提高对整体线性流特征模式的认识有助于重新定义实验观测之间的边界,这可能归因于线性整体而不是非线性机制。

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