Effects of large-scale intermittency of turbulence on scalar spectra at high wave numbers by Reginald J. Hill

Cover of: Effects of large-scale intermittency of turbulence on scalar spectra at high wave numbers | Reginald J. Hill

Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories in Boulder, Colo .

Written in English

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Subjects:

  • Scalar field theory.,
  • Atmospheric turbulence.,
  • Reynolds number.

Edition Notes

Book details

StatementR.J. Hill.
SeriesNOAA technical report ERL ; 409. WPL -- 54., NOAA technical report ERL -- 409., NOAA technical report ERL -- 54.
ContributionsWave Propagation Laboratory.
Classifications
LC ClassificationsU66 no.409
The Physical Object
Paginationiii, 19 p. ;
Number of Pages19
ID Numbers
Open LibraryOL17544798M

Download Effects of large-scale intermittency of turbulence on scalar spectra at high wave numbers

Effects of large-scale intermittency of turbulence on scalar spectra at high wave numbers. Boulder, Colo.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, (OCoLC) Material Type: Government publication, National government publication, Internet resource: Document Type.

On a Symmetry of Turbulence. Effects of large-scale intermittency of turbulence on scalar spectra at high wave numbers rate intermittency on the shape of the high wave number portion of.

Possible Effects of Small-Scale Intermittency in Turbulent Reacting Flows Article in Flow Turbulence and Combustion 72() June with 11 Reads How we measure 'reads'. Large-scale intermittency and rare events boosted at dimensional crossover in anisotropic turbulence Ryo Onishi1, Keiko Takahasi1*, Koji Goto2, Masatoshi Imada3* Affiliations: 1Center for Earth Information Science and Technology, Japan Agency for Marine-earth Science and Technology, Showa-machi, Kanazawa-ku, Yokohama: Keiko Takahashi, Koji Goto, Ryo Onishi, Masatoshi Imada.

High-resolution spatial and temporal measurements have revealed small-scale intermittency in many phenomena, such as the dissipation of energy in the atmosphere or the ocean [4, 5], the rain formation process, superfluid turbulence, and the solar : Annick Pouquet.

Mydlarski L (), Mixed velocity-passive scalar statistics in high-Reynolds-number turbulence, J. Fluid Mech. (to appear). Xu G (), Small-scale measurements in turbulent shear flows, PhD Thesis, University of by: 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.

Turbulence is caused by excessive kinetic energy in parts of a fluid flow, which overcomes the damping effect of. Effects of Freestream Turbulence, Turbulence Length Scale, and Reynolds Number on Turbine Blade Heat Transfer in a Transonic Cascade Preface The combustion temperature of gas turbine engines continue to increase in order to get a higher work output and higher efficiency from gas turbine engines.

To handle the high. Engineering Turbulence Modelling and Experiments 6 leading to reduced SGS dependency and improved predictions of the noise spectra in the high frequency domain.

The flow field and aerodynamic noise caused by a NACA blade with a tip in an incident flow is simulated. A large-scale unsteady compressible LES combined with direct noise. The question of how wall turbulence changes at high Reynolds numbers has received heightened interest over the last decade or so.

This has resulted in the construction or planning of high Reynolds number facilities, including the Princeton Superpipe (Zagarola and Smits, ), the development of SLTEST, an atmospheric test facility in the Great Salt Lake Desert, Utah (Klewicki et al., Cited by: Large-scale flow effects, energy transfer, and self-similarity on turbulence P.

Mininni, A. Alexakis, and A. Pouquet NCAR, P.O. BoxBoulder, ColoradoUSA Received 21 February ; published 17 July The effect of large scales on the statistics and dynamics of turbulent fluctuations is studied using data from.

Scaling Laws and Intermittency in Highly Compressible Turbulence Alexei G. Kritsuk potheses of K41 were then revisited and refined to account for intermittency effects [5, 6, 7].

While the K41 phenomenology became the cornerstone for all subsequent de- Notice strong bottleneck contamination in the spectra at high wavenumbers. Turbulence in a box: quantification of large-scale resolution effects in isotropic turbulence free decay - Volume - M. Meldi, P.

SagautCited by: 8. 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. Kolmogorov Cited by: Passive scalar turbulence has recently yielded to mathematical analysis, and such progress may ultimately lead to a better understanding of the still intractable problem of fluid turbulence itself.

large-scale energy input than inertial range scaling coefficients. Key words: homogeneous turbulence, intermittency, turbulent flows 1. Introduction. One of the earliest recognitions of the importance of fluctuations in the energy dissipation rate in turbulence can be found in a footnote by Landau in the Cited by: 7.

Results of a wind tunnel experiment in which there are systematic variations of free stream turbulence above a flat-plate boundary layer are presented. Upstream of the plate, an active grid generates free stream turbulence varying in intensity from % to %. The momentum thickness Reynolds number of the boundary layer varies from to nearly Cited by: Theory of turbulence at small scales plays a fundamental role in modeling turbulence and in retrieving information from physical measurements of turbulent flows.

A systematic methodology based on direct numerical simulations of turbulent flows is developed to investigate universality of small scale turbulence. Understanding characteristics of the small scale intermittency in turbulent flows Author: Saba Almalkie. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics.

Calculating Length Scales from Passive Scalar Field. Strong and weak turbulence. How are the turbulent spectra determined in relativistic turbulence.

the turbulence grid for the high inlet turbulence cases. The incidence angles that are presented apply to the take-off and cruise conditions for the VSPT project.5 The blades and their nominal inlet flow vectors are shown in Figure 2.

As shown in Figure 1, a turbulence grid was installed upstream of the blade row to generate high inlet turbulenceCited by: 1.

Numerical study of small-scale intermittency in three-dimensional turbulence By ERIC D. SIGGIA Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New Yorkand National Center for Atmospheric Research, P.O. BoxBoulder, Colorado (Received 2 October and in revised form 27 August ).

O(), highlight promising applications of the refined model to high-Reynolds-number flows, in which coherent scales become the primary contributor to the fluctuating energy. DOI: /PhysRevFluids I. INTRODUCTION Large-scale coherence in high-Reynolds-number wall turbulence has been evidenced by flow.

Given the Reynolds number effects observed for single point statistics, the aim of the present work is to extend the scale energy analysis conducted by Marati et s¼ to higher Reyn-olds numbers.2 Thus, the scale energy dynamics are examined using DNS data of turbulent chan-nel flows at Re s¼,and in this study.

Details. Space-time correlation is a staple method for investigating the dynamic coupling of spatial and temporal scales of motion in turbulent flows. In this article, we review the space-time correlation models in both the Eulerian and Lagrangian frames of reference, which include the random sweeping and local straining models for isotropic and homogeneous turbulence, Taylor's frozen-flow model and Cited by: Anisotropy of small-scale scalar turbulence U x y 1 2 D z r H Us s=0 tic of the experimental setup as seen from above.

The two probes are denoted by 1 and 2. The mean wind Uis oriented along the z-axis (see text). The probes are separated by a xed distance = m along the y-axis and oriented orthogonal to U. The remaining. large-scale turbulence) within the mixing layer. • POD Modes – Create basis describing relative size, shape, and distribution of large-scale structures within mixing layer.

– Using image intensity fluctuation from mean. – Based on snapshot method of Sirovich, • Image Reconstruction. A single-point time record makes it hard to elucidate spatial flow structure, especially large-scale ones like that of VLSMs in turbulent boundary layers or the wave packets of turbulent jets.

Much of the cutting-edge experimental work in turbulence is toward use of coherent spatio-temporal structures to form practical flow models. Numerical Simulations of Forced Shallow-Water Turbulence: Effects of Moist Convection on the Large-Scale Circulation of Jupiter and Saturn ADAM P.

SHOWMAN The University of Arizona, Tucson, Arizona (Manuscript received 15 Junein final form 6 December ) ABSTRACT. T1 - Particle acceleration at a flare termination shock. T2 - Effect of large-scale magnetic turbulence. AU - Guo, Fan. AU - Giacalone, Joe. PY - /7/1. Y1 - /7/1.

N2 - We investigate the acceleration of charged particles (both electrons and protons) at collisionless shocks predicted to Cited by: • The Madison Dynamo Experiment has shown that the large scale turbulent flows are important in understanding the dynamics of the large scale mean magnetic field • The inhibition of these flows has resulted in a ~60% reduction in turbulent resistivity and a 90% reduction of the turbulent α effect.

15 Tuesday, Measurement of Atmospheric Turbulence by Means of Light, Sound, and Radio Waves The Effects of the Turbulent Atmosphere on Wave Propagation. Israel Program for Scientific Translation, Jerusalem, pp. and B. Balsley, Small-scale and large-scale intermittency in the nocturnal boundary layer and the residual layer.

Fluid Mech. This volume presents selected papers from the IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, convened in Princeton, NJ, USA, September I, The behavior ofturbulence at high Reynolds number is interesting from a fundamental point of view, in that most theories of turbulence make very specific predictions in the limit of.

Large-scale turbulence in fluid layers and other quasi-two-dimensional compressible systems consists of planar vortices and waves. Separately, wave turbulence usually produces a direct energy cascade, while solenoidal planar turbulence transports energy to large scales by an inverse cascade.

Pope has remedied that situation by adjoining a survey of ideas on closure modeling to an introduction to turbulence theory This book is a welcome addition to the literature on turbulence.

The nature of turbulent motion at large wave-numbers. Proc. Soc. London Ser. A– Large-scale structures in wakes behind Author: Stephen B. Pope. for example the geometry of the grids in grid-generated turbulence and the nature of large-scale forcing in simulations. Similar issues can be explored for χ≡ 2κ (∂φ/∂x i)2, which is the mean ‘dissipa-tion’ rate of the scalar variance φ2, φ being the fluctuating scalar and κ its diffusion coefficient.

TDA Progress Report April-June Atmospheric Propagation Effects Relevant to Optical Communications K. Shaik Communications Systems Research Section A number of atmospheric phenomena affect the propagation of light.

This article reviews the effects of clear-air turbulence as well as atmospheric turbidity on optical com- Size: 2MB. Lumley used scaling arguments à la Kolmogorov to predict the form of the turbulence energy spectrum under various conditions (Lumley a), including the effects of uniform strain, where he showed that the covariance spectrum follows a k −7/3 law (where k is the wave number), thus decreasing more rapidly than the energy spectrum (k −5/3).

This volume presents selected papers from the IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, convened in Princeton, NJ, USA, September I, The behavior ofturbulence at high Reynolds number is interesting from a fundamental point of view, in that most theories of turbulence.

The CTAs have been adjusted and the turbulence frequency spectra that they measure are checked against a high-quality CTA produced by the Danish company Dantec Dynamics. Finally, data which routinely amount to more than 10 9 velocity samples are stored on the hard-disks of a computer.

The goal of this workshop is to bring together leading experts from the geophysical and astrophysical communities to discuss basic aspects of the physics of turbulence, instabilities, and waves in the context of rotating plasma, large-scale flows, predictability, and to foster novel developments both in astrophysical and geophysical fluid dynamics.

"Structure Functions in Wall-bounded Flows at High Reynolds Numberâ€, Abstract: G in Session G Turbulent Boundary Layers: High Reynolds Numbers and Pressure Gradient Effects", 69th Annual Meeting of the APS Division of Fluid Dynamics. Portland, OR. Novem turbulence, surface conditions, and disturbances may cause transition to turbulence at lower Reynolds Re ≥ 2, numbers dh Red ≥20, is the Rayleigh number µ ρ = U L ReL L =x,d,dh,etc.

k gL T Cp gL T µ ρ β ∆ = να β ∆ = 3 2 3 Ra Pr Ra ≥ k µCp = α ν Pr = is the Prandtl numberFile Size: 1MB. Thus, large-scale reconnection in the solar wind is a very promising area for LV Preliminary comparisons between such events in MHD turbulence and in the high-speed solar wind have yielded very promising results.

Criteria can be employed that are designed specifically to look for large-scale by:

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