Last edited by Meramar
Friday, April 17, 2020 | History

2 edition of Turbulent wakes in a stratified flow. found in the catalog.

Turbulent wakes in a stratified flow.

Christos Christakis Alexopoulos

Turbulent wakes in a stratified flow.

  • 283 Want to read
  • 2 Currently reading

Published in Toronto .
Written in English

    Subjects:
  • Boundary layer,
  • Fluid dynamics,
  • Turbulence

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Paginationxi, 124 leaves.
    Number of Pages124
    ID Numbers
    Open LibraryOL18588508M

    Mean flow structure and advection of instantaneous coherent-flow pattern around T-type and L-type groynes. A. Kadota & K. Suzuki. Vertical transport in high Reynolds number stratified turbulent wakes. P.J. Diamessis. Density and velocity fields of internal waves generated by oscillating bodies in a stratified environment. B.M. Marino & L.P. Full text of "Engineering Calculation Methods For Turbulent Flow" See other formats.


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Turbulent wakes in a stratified flow. by Christos Christakis Alexopoulos Download PDF EPUB FB2

Free Surface Flow: Environmental Fluid Mechanics introduces a wide range of environmental fluid flows, such as water waves, land runoff, channel flow, and effluent discharge.

The book provides systematic analysis tools and basic skills for study fluid mechanics in natural and constructed environmental flows. Turbulent entrainment in stratified flows - Volume 6 Issue 3 - T. Ellison, J. Turner Mixing of dense fluid in a turbulent pipe flow Part 1.

Overall description of the flow. Journal of Fluid Mechanics, Vol. 8, Issue. 04, p. On transport in turbulent wakes: methane wakes. Proceedings of the Royal Society of by:   This chapter presents experimental and theoretical results on the transition from a laminar to a turbulent wake in a stratified fluid.

The case of a cylinder is analysed in detail at low Reynolds number since it gives rise to the famous von Karman vortex street when the Author: Patrice Meunier.

Request PDF | Turbulent/non-turbulent interfaces in wakes in stably stratified fluids | We report on a study, employing direct numerical simulations, of the turbulent/non-turbulent interface of a. Growth and decay of turbulence in a stably stratified shear flow - Volume - J.

Rohr, E. Itsweire, K. Helland, C. Van AttaCited by: The numerical analysis of the characteristics of a turbulent flow in momentumless wakes behind a sphere and a prolate body of revolution in a homogeneous and linearly stratified media is performed.

A water channel has been used as a statistically steady experiment to investigate the development of a buoyant plane wake. Parallel streams of hot and cold water are initially separated by a splitter plate and are oriented to create an unstable by: 1. In the stratified case, the turbulent kinetic energy actually increases at first in the region between the cores and eventually throughout the entire recirculation zone.

1~ o.s ~ I: 01 I rl[:J turbulent unstratified | - - turbulent stratified |, ~ ~.'. Brighton PWM () Strongly stratified flow past three-dimensional obstacles. Q J R Meteorol Soc – CrossRef Google Scholar Builtjes PJH () The interaction of wind turbine by:   The vortices described above for stratified flows have close analogs in shallow-water dynamics as well.

Figure 10 shows two examples: one in which the fluid layer passes completely over the obstacle (Figure 10(a) and 10(b)), and one in which the flow is blocked upstream, causing the layer to split around the obstacle (Figure 10(c) and 10(d)).

Free Surface Flow: Environmental Fluid Mechanics introduces a wide range of environmental fluid flows, such as water waves, land runoff, channel flow, and effluent discharge.

The book provides systematic analysis tools and basic skills for study fluid mechanics in natural and constructed environmental flows. Density stratification occurs naturally in many fluids, particularly in the ocean environment. The stratification can be due to thermal effects or results from salt or other impurities in the fluid.

The study of the effects of various types of stratifications is important because even a mild. @article{osti_, title = {Controls on Turbulent Mixing in a Strongly Stratified and Sheared Tidal River Plume}, author = {Jurisa, Joseph T. and Nash, Jonathan D. and Moum, James N. and Kilcher, Levi F.}, abstractNote = {Considerable effort has been made to parameterize turbulent kinetic energy (TKE) dissipation n.

and mixing in buoyant plumes and stratified shear flows. This book allows readers to tackle the challenges of turbulent flow problems with confidence.

It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and.

Integral methods are used to derive similarity solutions for several quantities of interest including the cross-stream velocity, Reynolds stress, the dominant turbulent kinetic energy production term, and eddy diffusivities of momentum and heat for axisymmetric and Cited by:   Chongsiripinyo K.

and Sarkar S., “Stratified turbulence in disk wakes”, 11th International Symposium on Turbulence and Shear Flow Phenomena, Southampton, UK, Chongsiripinyo K. and Sarkar S., “Effect of stratification on the turbulent wake behind a sphere at Re=10,”, 10th International Symposium on Turbulence and Shear Flow.

A numerical study of atmospheric turbulence effects on wind-turbine wakes is presented. Large-eddy simulations of neutrally-stratified atmospheric boundary layer flows through stand-alone wind turbines were performed over homogeneous flat surfaces with four different aerodynamic roughness lengths.

Emphasis is placed on the structure and characteristics of turbine wakes in the cases where the Cited by: Stably Stratified and Rotating Turbulence The main motivation for SIG14 is to study and understand the role of the body force effects on turbulence, especially stratification and rotation.

These are fundamental in environmental non-homogeneous flows, for example to predict diffusion of. 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 flow phenomena Cited by: Turbulent Flow: Analysis, Measurement, and Prediction Peter S. Bernard, James M. Wallace. Provides unique coverage of the prediction and experimentation necessary for making predictions.

You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Turbulent flow, type of fluid (gas or liquid) flow in which the fluid undergoes irregular fluctuations, or mixing, in contrast to laminar flow, in which the fluid moves in smooth paths or turbulent flow the speed of the fluid at a point is continuously undergoing changes in both magnitude and direction.

The flow of wind and rivers is generally turbulent in this sense, even if the. The first four symposia in the series on turbulent shear flows have been held alternately in the United States and Europe with the first and third being held at universities in eastern and western States, respectively.

Continuing this pattern, the Fifth Symposium on Turbulent Shear Flows was held. "The turbulent, stratified near wake of a sphere at Re = and Fr = 3," 67th Annual Meeting of the American Physical Society -Division of Fluid Dynamics,San Francisco, CA ().

Pal A. and Sarkar S., "Effect of External Turbulence on the Evolution of a Towed Wake in a Stratified Environment," 66th Annual Meeting of the American. Wakes from wind farms can extend over 50 km downwind in stably stratified conditions.

These wakes can undermine power production at downwind turbines, adversely undermining revenue. As such, wind farm wake impacts must be considered in wind resource assessments, especially in regions of dense wind farm development.

Sites that are down. The National MetaCenter for Computational Science; CRPC Applications at Syracuse University. Pertinent to my research topic (stratified wakes) Research interests of Robert Breidenthal at University of Washington; USCAE Geophysical Fluid Dynamics has a stratified turbulent wakes section; Turbulence by the Numbers is a discussion on turbulence with a few results.

P Orlandi: The importance of wall-normal Reynolds stress in transitional and turbulent rough channel flows GN Coleman: The question of universality of turbulent axisymmetric wakes Coffee Session 3 (TG Thomas) PE Hancock: Wind turbine wakes in stratified flow: some initial experience with wind.

The phenomena treated in this book all depend on the action of gravity on small density differences in a non-rotating fluid. The author gives a connected account of the various motions which can be driven or influenced by buoyancy forces in a stratified fluid, including internal waves, turbulent shear flows and buoyant convection.

This excellent introduction to a rapidly developing field. The aim of this contribution is to present the results of experiments conducted to elucidate the conditions of formation and evolution of planar dipolar eddies in a stratified fluid in the presence of a vertical background shear.

The flow regime diagram is derived and conditions under which the formation of dipolar eddies is possible are found and by: In the last 25 years, one of the most striking advances in Fluid Mecha­ nics was certainly the discovery of coherent structures in turbulence: lab­ oratory experiments and numerical simulations have shown that most turbulent flows exhibit both spatially-organized large-scale structures and.

ISBN: OCLC Number: Description: 1 online resource (xiii, pages) Contents: Remarks on turbulence theory --Hydrodynamic visualization of organized structures and turbulences in boundary layers, wakes, jets or propellor flows --I. Free Shear Flows --The emergence of characteristic (coherent?) motion in homogeneous turbulent shear flows --Generation of.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Both the towed and self-propelled wakes, at Re =are found to exhibit a time span when, although the turbulence is strongly stratified as indicated by small Froude number, the turbulent dissipation rate decays according to inertial scaling.

Coordinator. Chairman: Jose M. Redondo [email protected] UPC, Barcelona, Spain. Tel 34 93 Fax 34 93 Steering Committee. The Structure of Turbulent Flows.- Introduction.- Reynolds number similarity and self-preservation.- Intermittency and entrainment.- The structure of a turbulent wake.- Turbulent motion near a wall.- Large eddies in a boundary layer.- The Coanda effect.- Stratified shear flows.- Reverse transition.-Price: $ Part III Fundamental Flow Phenomena and Turbulence: Turbulence in the Environment.

Turbulent Dispersion. Stratified Hydraulics. Hydraulics of Vegetated Canopies. Canopy Turbulence. Jets and Plumes. Stratified Wakes and Their Signatures. Gravity Currents and Intrusions. Internal Gravity Waves. Rotation Effects in Environmental Flows.

Vortex. Description of the book "The Structure of Turbulent Shear Flow": Turbulent flow is a most important branch of fluid dynamics yet its complexity has tended to make it one of the least understood.

Empirical data have been appearing rapidly for more than twenty years but a consistent theory of turbulent flow based on the results has been lacking. Page viii - and their application in hydraulics A state-of-the-art review The calculation of turbulent flow phenomena, a task of great practical importance in hydraulics and many other areas, requires model approximations about the transport of momentum, heat and mass by the turbulent book provides an introduction to the subject of turbulence modelling in a form easy to.

The entrainment rate of a turbulent flow can always be expressed as the ratio of a length to a R.E. Turbulent stratified entrainment and a new parameter for surface F.A.

Effects of a periodic disturbance on structure and mixing in turbulent shear layers and. Li Y, Meneveau C (). Intermittency trends and Lagrangian evolution of non-Gaussian statistics in turbulent flow and scalar transport.

Journal of Fluid Mechanics. Kang HS, Meneveau C (). Experimental measurements of spectral subgrid-scale Prandtl number in a heated turbulent wake flow, EDQNM predictions and 4/3-law. In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid is in a turbulent flow regime.

The moving fluid creates a space devoid of downstream-flowing fluid on the downstream side of the object. Fluid behind the obstacle flows into the void creating a swirl of fluid on each edge of the obstacle, followed by a short reverse flow of fluid behind the.

Parviz Moin is part of Stanford Profiles, official site for faculty, postdocs, students and staff information (Expertise, Bio, Research, Publications, and more). The site facilitates research and collaboration in academic endeavors.This paper deals with the steady, frictionless, nonheatconducting flow field of a thin airfoil moving supersonically in an atmosphere with a weak wind gradient.

Because of this wind gradient, the flow gradually becomes transonic in the far field below the airfoil. It is shown that a solution which describes both supersonic and transonic regimes can be derived by matching two by: Cited by H.

Tanaka, A. Tsage, M. Hirata, & H. Nishiwak, “Effects of Buoyancy and of Acceleration Owing to Thermal Expansion on Forced Turbulent Convection in Vertical Circular Tubes-Criteria of Effects, Velocity, and Temperature Profiles, and Reverse Transition From Turbulent to Laminar-Flow,” Int.

J. Heat and Mass Transfer, vol. 16, no. 6.