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Journal ArticleDOI

A general classification of three-dimensional flow fields

Min S Chong, +2 more
- 01 May 1990 - 
- Vol. 2, Iss: 5, pp 765-777
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TLDR
In this paper, the geometry of solution trajectories for three first-order coupled linear differential equations can be related and classified using three matrix invariants for elementary three-dimensional flow patterns defined by instantaneous streamlines for flow at and away from no slip boundaries for both compressible and incompressible flow.
Abstract
The geometry of solution trajectories for three first‐order coupled linear differential equations can be related and classified using three matrix invariants. This provides a generalized approach to the classification of elementary three‐dimensional flow patterns defined by instantaneous streamlines for flow at and away from no‐slip boundaries for both compressible and incompressible flow. Although the attention of this paper is on the velocity field and its associated deformation tensor, the results are valid for any smooth three‐dimensional vector field. For example, there may be situations where it is appropriate to work in terms of the vorticity field or pressure gradient field. In any case, it is expected that the results presented here will be of use in the interpretation of complex flow field data.

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Citations
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DissertationDOI

Advanced instability methods using spectral/hp discretisations and their applications to complex geometries

TL;DR: In this article, a flow past a cylinder in a fully developed vortex shedding regime is considered, and the effects on the aerodynamic forces, the wake topology and the dynamics of the vorticity are investigated using spanwise sinusoidal and Gaussian forcing.
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Can vortex criteria be objectivized

TL;DR: In this article, the authors derived necessary and sufficient conditions for the existence of a generalized frame change prescribed pointwise through its Jacobian field and concluded that, of all proposed objectivization approaches in the literature, only the replacement of the spin tensor with the spin-deviation tensor is applicable to generic fluid flows.
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Physical properties corresponding to vortical flow geometry

K Nakayama
TL;DR: In this article, the radial and azimuthal velocities in a plane nonparallel to the eigenvector corresponding to the real eigenvalue of the velocity gradient tensor are expressed as specific quadratic forms.
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Influence of bed proximity on the three-dimensional characteristics of the wake of a sharp-edged bluff body

TL;DR: In this article, the gap flow effect in a wake is investigated to develop an improved picture of the formation of fluid structures via a numerical simulation of flow past a bluff body with two different clearances from the bed.
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New image analysis methods for the study of mixing patterns in stirred tanks

TL;DR: A method of treating data acquired with the planar laser-induced fluorescence technique has been developed to visualize the topology of two-dimensional concentration fields and to describe the dyna... as discussed by the authors.
References
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Book

Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields

TL;DR: In this article, the authors introduce differential equations and dynamical systems, including hyperbolic sets, Sympolic Dynamics, and Strange Attractors, and global bifurcations.

A Reflection on Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields

TL;DR: In this paper, the authors introduce differential equations and dynamical systems, including hyperbolic sets, Sympolic Dynamics, and Strange Attractors, and global bifurcations.
Book

Differential Equations, Dynamical Systems, and Linear Algebra

TL;DR: In this article, the structure theory of linear operators on finite-dimensional vector spaces has been studied and a self-contained treatment of that subject is given, along with a discussion of the relations between dynamical systems and certain fields outside pure mathematics.
Journal ArticleDOI

Direct simulation of a turbulent boundary layer up to R sub theta = 1410

TL;DR: In this paper, the turbulent boundary layer on a flat plate, with zero pressure gradient, is simulated numerically at four stations between R sub theta = 225 and R sub tta = 1410.
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