small-scale structure of turbulence

by J.A Herweijer

Publisher: University of Eindhoven in Eindhoven

Written in English
Published: Pages: 159 Downloads: 306
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Edition Notes

StatementJ.A. Herweijer.
The Physical Object
Pagination159p.
Number of Pages159
ID Numbers
Open LibraryOL20485820M

Get this from a library! Small-Scale Structures in Three-Dimensional Hydrodynamic and Magnetohydrodynamic Turbulence: Proceedings of a Workshop Held at Nice, France January [Maurice Meneguzzi; Annick Pouquet; Pierre-Louis Sulem;] -- Small-scale behavior in distorted turbulent boundary layers at high Reynolds number -- Vortex stretching . Interactions of large-scale free-stream turbulence with turbulent boundary layers 3 the kinematic viscosity. Therefore, the near-wall information is needed to establish a clear relationship between the near-wall turbulence and FST level and also to determine the extent of the FST penetration into the near-wall region. Currently the mechanism. Turbulence It is a matter of common experience that °ows, if they are su–ciently fast, become disordered. Smooth, or laminar, motion can only be maintained when it is su–-ciently slow or when it happens on a su–ciently small scale. Otherwise, as in the case of rivers or of the wind, it becomes unstable, and turbulent °uctuations Size: 1MB.   The likelihood of small-scale universality increases with increasing distance (say, in wave number space) from the nonuniversal large scales. This distance increases as some power of the flow Reynolds number, and so a great deal of emphasis has been put on creating and quantifying very high Reynolds number flows under controlled by:

a parameterization of the second-order velocity structure function indicate that the normalized third-order structure function approaches 4/5 more rapidly for forced than for decaying turbulence. These trends are supported by measurements and numerical data in . The small-scale structure of fully developed turbulent flows is commonly believed to form an universal state which exhibits stationarity, homogeneity, and isotropy in a statistical sense, cf. Monin & Yaglom () and Frisch (). This state is characterized by the existence of a flux of energy, which is injected into the fluid. Papers in the book cover topics such as scalable mobile robots for deployment in polar climates, the challenges of landing on Mars, thin-film active materials, vascular tissue engineering, small-scale processes and large-scale simulations of the climate system, simulating physically accurate illumination in computer graphics, and designing. Expressions are derived for turbulence spectra measured with a single hot wire and wires in an X-array, and are applied to the problem of measurement of spectra at small scales. Isotropic turbulence and Pao's form for the three-dimensional spectrum are assumed.

A small-scale irregular structure has been generated by a first wave front at the level of a sporadic E layer which characterized the ionosphere at the time of the experiment. The time scale of these fluctuations is about 1 to 2 s; its lifetime is more» about 2 min. Similar irregularities were also observed at the level of a second wave front. Kolmogorov turbulence theory is the set of hypotheses that a small-scale structure is statistically homogeneous, isotropic, and independent of the large-scale Size: KB. Clear-air turbulence (CAT), erratic air currents that occur in cloudless air between altitudes of 6, metres (20, feet) and constitute a hazard to turbulence can be caused by small-scale (i.e., hundreds of metres and less) wind velocity gradients around the jet stream, where rapidly moving air is close to much slower air. Topics covered in the review include spectra and structure functions of the scalar, the topology and isotropy of the small-scale scalar field, as well as the correlation between the fluctuating rate of strain and the scalar dissipation rate. In each case, Cited by:

small-scale structure of turbulence by J.A Herweijer Download PDF EPUB FB2

Analysis of the small-scale structure of turbulence on smooth and rough walls Article (PDF Available) in Physics of Fluids 15(1) November with Reads How we measure 'reads'. Analysis of the small-scale structure of turbulence on smooth and rough walls D.

Poggi, A. Porporato, and L. Ridolfi Dipartimento di Idraulica, Trasporti ed. Batchelor's theory of the turbulent straining of small‐spatial‐scale amplitude variations of a convected scalar field is re‐examined to see the effects of fluctuation of Cited by: Ten Chapters in Turbulence - small-scale structure of turbulence book by Peter A.

Davidson December The small-scale structure of turbulence PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de Rector Magnificus, J.H.

van Lint, voor een commisie aangewezen door het College van Dekanen in het openbaar te verdedigen op dinsdag 12 december om uur doorCited by: 6.

Turbulence – Introduction to Theory and Applications of Turbulent Flows (Online ed.). Springer. ISBN Original scientific research papers and classic monographs. Kolmogorov, Andrey Nikolaevich (). "The local structure of turbulence in incompressible viscous fluid for very large Reynolds numbers".

Concepts explored include the equations for the correlation and spectral functions of isotropic turbulence, self-preservation hypotheses, spectral energy-transfer hypotheses, the Millionshchikov zero-fourth-cumulant hypothesis and its application to the study of pressure and acceleration fluctuations, the small-scale structure of turbulence at Cited by: 4.

Page 1 of November 7, Annual Reviews AR AR Annu. Rev. Small-scale structure of turbulence book Mech. –72 Copyright c by Annual Reviews Inc. Abstract. The evidence on small compact vortex structures in turbulent flows is summarised for various experimental and numerical flow fields.

It is consistent with a model of strained almost two dimensional vortices with radii of the order of the Kolmogorov scale, and circulation Reynolds numbers of a few by: 4.

On the lognormality of the small-scale structure of turbulence. Authors; The concept of the intermittency of the small-scale structure and the theoretical approach involving lognormality of the probability density distribution of the dissipation rate are evaluated.

and Tennekes, H.:‘Measurements of the Small-Scale Cited by: The articles cover a wide range of topics, including the scaling and organized motion in wall turbulence, small scale structure, dynamics and statistics of homogeneous turbulence, turbulent transport and mixing, and effects of rotation, stratification and magnetohydrodynamics, as well as superfluidity.

The book will be useful to researchers and. A lattice model of the inertial range in turbulence theory is presented; it has features in common both with the qualitative theory and with a vortex method solution of Euler's equations.

the small scale may seem unrewarding. One reason for the interest is that a proper theory of turbulence, if one were to emerge, may well relate to the small scale, which has the best prospect of being universal or quasi-universal.

Any aspect of turbulence that can be understood precisely would be valuable in itself. Failure to recognize the importance of the finite Reynolds number effect on small scale turbulence has, by and large, resulted in misguided assessments of the first two hypotheses of Kolmogorov [“Local structure of turbulence in an incompressible fluid for very large Reynolds numbers,” Dokl.

Akad. Nauk S – ()] or K41 as well as his third hypothesis [A. Cited by: Small-scale structures in turbulent flows appear as a subtle mixture of order and chaos that could play an important role in the energetics. The aim here is a better understanding of the similarities and differences between vortex and current dynamics, and of the influence of these structures on the statistical and transport properties of hydrodynamic and magnetohydrodynamic turbulence.

For small-scale turbulence Damk¨ohler argued that turbulence modi es the transport between the reaction zone and the unburnt gas. In analogy to the scaling relation for the laminar burning velocity sL ˘(D=tc) 1=2; () where tc is the chemical timescale and D the molecular di usivity, he used the turbulent di usivity Dt to obtain sT ˘ Dt=tc.

The CLUSTER mission has been designed primarily to study small-scale structures (from a few to a few tens of ion Larmor radii) in the Earth's plasma environment. It is proposed that a CLUSTER of four spacecraft, instrumented to make comprehensive measurements of plasma particles and electromagnetic fields, be placed in a suitable orbit which takes them through key regions of.

The book also discusses small-scale and large-scale atmospheric turbulence and applications to numerical weather analysis and prediction.

The manuscript is a vital source of data for readers interested in random theory. The articles cover a wide range of topics, including the scaling and organized motion in wall turbulence, small scale structure, dynamics and statistics of homogeneous turbulence, turbulent transport and mixing, and effects of rotation, stratification and magnetohydrodynamics, as Cited by: Small-scale structures in turbulent flows appear as a subtle mixture of order and chaos that could play an important role in the energetics.

The aim here is a better understanding of the similarities and differences between vortex and current dynamics, and of the influence of these structures on. collaboration group Geometric structure of small-scale turbulence. I want also thank Dr.-Ing.

Sergio Hoyas for the great help with the DNS code and the hospitality during my stay in Valencia. Furthermore, I want to mention that I appreciate the constructive cooperation with Dr.-Ing.

Lipo Wang and Jens Henrik Göbbert within the framework of the. This textbook presents a modern account of turbulence, one of the greatest challenges in physics. The state-of-the-art is put into historical perspective five centuries after the first studies of Leonardo and half a century after the first attempt by A.N.

Kolmogorov to predict the properties of flow at very high Reynolds numbers. Such "fully developed turbulence" is ubiquitous in both. Similar to other renewable energy sources, wind energy is characterized by a low power density. Hence, for wind energy to make considerable contributions to the world's overall energy supply, large wind farms (on- and offshore) consisting of arrays of ever larger wind turbines are being envisioned and built.

From a fluid mechanics perspective, wind farms encompass turbulent Cited by: Small-scale statistics and structure of turbulence -- in the light of high resolution direct numerical simulation \/ Yukio Kaneda and Koji Morishita -- 2.

Structure and dynamics of vorticity in turbulence \/ J\u00F6rg Schumacher, Robert M. Kerr and Kiyoshi Horiuti -- 3. Small-scale turbulence has been an area of especially active research in the recent past, and several useful research directions have been pursued.

Here, we selectively review this work. The emphasis is on scaling phenomenology and kinematics of small-scale structure.

After providing a brief introduction to the classical notions of universality due to Kolmogorov and others, we. Small-Scale Turbulence Turbulence in the atmosphere may be caused by convection or by wind shear, and static stability is influential in each case.

Ignoring moist dynamics, convection requires ∂ θ v / ∂ z to be negative, which occurs most commonly when the air is in contact with a warmer Earth's surface, such as a sunny day over dry land.

The articles cover a wide range of topics, including the scaling and organized motion in wall turbulence, small scale structure, dynamics and statistics of homogeneous turbulence, turbulent transport and mixing, and effects of rotation, stratification and magnetohydrodynamics, as.

Purchase Small-Scale Turbulence and Mixing in the Ocean, Volume 46 - 1st Edition. Print Book & E-Book. ISBNBook Edition: 1. Buy Small-Scale Turbulence and Mixing in the Ocean on FREE SHIPPING on qualified orders.

A related turbulence feature, which is indeed the fundamental characteristic that makes it so theoretically and computationally difficult, is that it exhibits far more small-scale structure than its nonturbulent counterparts.

Styxpaint changed the energy cascade from large to small scale into the reverse, neglecting a century of turbulence research. As well as introducing a strong bias towards two-dimensional turbulence (neglecting vortex stretching which is at the core of 3D turbulence).Vertical Organization of Flow Structure in Channel Flows.

First of all, you should expect the nature of turbulence to vary strongly from surface to bottom in the flow, because the boundary is the place where the vertical turbulent fluctuations must go to zero and where by the no-slip condition the fluid velocity itself must go to zero.

This is a companion video to the web feature "Improving Climate Change Predictions, One Cloud at a Time" produced by the Center for Climate Sciences at NASA's Jet Propulsion Laboratory (JPL). The.