Vorticity And Vortex Dynamics In Complex Turbulent Flows Pdf

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In fluid dynamics , turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow , which occurs when a fluid flows in parallel layers, with no disruption between those layers. Turbulence is commonly observed in everyday phenomena such as surf , fast flowing rivers, billowing storm clouds, or smoke from a chimney, and most fluid flows occurring in nature or created in engineering applications are turbulent.

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Vorticity and Vortex Dynamics

This book is a comprehensive and intensive monograph for scientists, engineers and applied mathematicians, as well as graduate students in fluid dynamics. It starts with a brief review of fundamentals of fluid dynamics, with an innovative emphasis on the intrinsic orthogonal decomposition of fluid dynamic process, by which one naturally identifies the content and scope of vorticity and vortex dynamics. This is followed by a detailed presentation of vorticity dynamics as the basis of later development. In vortex dynamics part the book deals with the formation, motion, interaction, stability, and breakdown of various vortices. Typical vortex structures are analyzed in laminar, transitional, and turbulent flows, including stratified and rotational fluids. Physical understanding of vertical flow phenomena and mechanisms is the first priority throughout the book.

Vorticity filaments beneath regular turbulent flow. Two-dimensional vorticity flow fields created in the wake of a plunging breaker were investigated for regular turbulent flow at a Reynolds number of 30 Velocity flow fields obtained from an earlier study that had employed digital particle image velocimetry, were analysed to determine vorticity shedding patterns and the interactions between the vorticity filaments as flow progressed. Central difference approximations were applied to the velocity fields to determine vorticity at each point in the field. Most of the strong instantaneous vorticity observed in the flow field was in the form of filaments.

Vorticity Evolution near the Turbulent/Non-Turbulent Interfaces in Free-Shear Flows

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Vortices are a major component of turbulent flow. The distribution of velocity, vorticity the curl of the flow velocity , as well as the concept of circulation are used to characterise vortices. In most vortices, the fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis. In the absence of external forces, viscous friction within the fluid tends to organise the flow into a collection of irrotational vortices, possibly superimposed to larger-scale flows, including larger-scale vortices. Once formed, vortices can move, stretch, twist, and interact in complex ways.

In channel flow, the transition from turbulence displays a crossover from laminar-turbulent patterns following a two-dimensional directed-percolation scenario to a regime with localized turbulent bands statistically propagating along a single direction. A simple model accounts for this bifurcation. The observability of the flow away from the wall in turbulent channels is studied using noiseless, although potentially incomplete, wall measurements. The reconstructions deteriorate with the distance to the wall, but coherent motions are still observable. We derive a multiple-scales solution for the Eulerian mean flow under wavepackets, which is driven by the divergence of Stokes drift and the setdown. This solution is valid for all water depths and is validated by flume experiments and recovers all previous solutions in their respective limits.

Google Scholar [ link ] ; Journal publications are shown in boldface. Kajishima and K. Nair, K.

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Vorticity and Vortex Dynamics
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    Vortical Flow Instability, Transition and Turbulence. Front Matter. Pages PDF · Vortical-Flow Stability and Vortex Breakdown. Jie-Zhi Wu, Hui-Yang Ma.

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