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Study of the Origin of Three Dimensional Structures in Shear Flows throughExternal Forcing

机译：外力作用下剪切流三维结构成因研究

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Experiments on an externally forced free shear layer are performed which studythe origin of three-dimensional structures and chaos in shear flows. Transition routes between the laminar two dimensional stages of shear flows and their final complex three dimensional stages are examined. Two avenues of investigation are pursued. First, the general idea of a multi-frequency route to chaos is examined which treats the shear flow as an open dynamical system. An attempt is made to apply concepts from nonlinear dynamics to these systems Secondly, a new approach to generating three-dimensional structures in shear flows which involves the creation of a spatial shear in the frequency of external perturbations is presented. In these experiments, a variety of vortex reconnection behaviors is observed at the discontinuity. (JHD)

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作者
Gharib, M.; Williams, K.;
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年度 1990
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总页数 23
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Vortices; Shear properties; Dynamics; External; Laminar flow; Layers; Nonlinearsystems; Perturbations; Routing; Spatial distribution; Three dimensional; Transitions; Two dimensional;

机译：涡旋;剪切特性;动力学;外部;层流;层;非线性系统;扰动;路径;空间分布;三维;过渡;二维;

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Study of the Origin of Three Dimensional Structures in Shear Flows throughExternal Forcing

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