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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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Proceedings ArticleDOI

Simulation of a Three-Dimensional Flapping Cantilever for Micro Air Vehicle Propulsion

TL;DR: In this article, a method is developed to simulate the fluid dynamics of low Reynolds number flow around solid objects with complex shapes on a fixed cartesian grid, where the boundary conditions on the solid/fluid interface are enforced through a specific treatment of grid points close to the interface.
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Spatio-Temporal Feature Exploration in Combined Particle/Volume Reference Frames

TL;DR: This work presents a novel method of feature exploration that can be used to investigate spatio-temporal patterns in both data types simultaneously and develops new ways of visually presenting the embedded information to a user in an intuitive manner.
Dissertation

A numerical study of turbulent drag reduction using streamwise travelling waves of spanwise wall velocity

Edward Hurst
TL;DR: In this article, a parallelisation of the fully-implicit fractional step based in-house DNS code was implemented, and the performance of streamwise travelling waves of spanwise wall velocity in a turbulent channel flow were performed at Reτ = 200, 400, 800 and 1600, scaling the input parameters in wall units.

Colliding droplets in turbulent flows: A numerical study

TL;DR: In this article, the authors investigated the effect of turbulence on the formation of clouds and the initiation of warm rain by using direct numerical simulation (DNS) up to the smallest Kolmogorov scales.
Journal ArticleDOI

Investigation on the vortex structure of propeller wake influenced by loading on the blade

TL;DR: In this article, the authors investigated the vortex structure of the wake behind a marine propeller in terms of loading variation by using particle image velocimetry and found that the velocity fields were ensemble averaged to study the spatial evolution of the drift and the behavior of the tip vortices in the region ranging from the trailing edge to one propeller diameter downstream.
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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