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3 edition of **Scale disparity and spectral transfer in anisotropic numerical turbulence** found in the catalog.

Scale disparity and spectral transfer in anisotropic numerical turbulence

- 210 Want to read
- 35 Currently reading

Published
**1994** by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .

Written in English

- Anisotropy .,
- Energy transfer.,
- Low Reynolds number.,
- Turbulence.,
- Turbulent flow.

**Edition Notes**

Statement | Ye Zhou, P.K. Yeung, James G. Brasseur. |

Series | ICASE report -- no. 94-64., NASA contractor report -- 194956., NASA contractor report -- NASA CR-194956. |

Contributions | Yeung, P. K., Brasseur, James G., Institute for Computer Applications in Science and Engineering. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL15403609M |

2D Homogeneous Turbulence 2D homogeneous turbulence is relevant to geophysical turbulence on large horizontal scales because of the thinness of Earth’s atmosphere and ocean (i.e., H=L˝1) and Earth’s rotation (i.e., Ro˝1) and stable stratiﬁcation (i.e., Fr˝1), both of which tend to suppress vertical ﬂow and. Anomalousspectral lawsin di erential models of turbulence Simon Thalabard1, Sergey Nazarenko2;3, S ebastien Galtier4 and Sergey Medvedev5 1 Department of Mathematics and Statistics, University of Massachusetts, Amherst, MA , USA. 2 Mathematics Institute, University of Warwick, Coventry CV4 7AL, United Kingdom 3 Service de Physique de l’Etat Condens e (DSM/IRAMIS/SPEC) -. characterize turbulence in the surface layer by means of standard spectral shapes. 1 n = fz/u fP C / σ 2 C Figure 2: Ensemble power spectra of CO2 at night Turbulence, however, does not always dominate the spectra. In the case of the ensemble spectra of carbon dioxide during the night (Figure 2) no single curve is found. It can be used as a numerical regularization in any model and is studied in [AS02, LN07a, P06], as well. In [LN07b] a descriptive turbulence phenomenology was used to study how well () predicts universal features of turbulence. Herein we apply a quantitative phenomenology based upon Pao’s energy transfer theory to the ADM ().

DETERMINING A TURBULENCE AVERAGING TIME SCALE BY FOURIER now considered, his classic paper (Reynolds, ). One of the key features of this approach is the averaging, which deﬁ nes the mean, variance and covariance and consequently simpliﬁ es the governing equations of turbulent ﬂ ow (Stull, ).File Size: 2MB.

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Scale disparity and spectral transfer in anisotropic numerical turbulence by the turbulence forcing scale. In such locally anisotropic turbulence, the particle pair dispersion depends on the. Get this from a library.

Scale disparity and spectral transfer in anisotropic numerical turbulence. [Ye Zhou; P K Yeung; James G Brasseur; Institute for Computer Applications in Science and Engineering.]. PHYSICS OF FLU () The anisotropic structure of turbulence and its energy spectrum G. a1,a) c2 1Laboratory for Aero and Hydrodynamics, Delft University of Technology, CA Delft, The Netherlands 2Department of Mechanical Engineering, The University of Melbourne, VictoriaAustraliaFile Size: KB.

Direct numerical simulations (DNSs) [22,28,29,31,32,33] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 The spectral energy transfer in isotropic decaying turbulence is examined using DNS and experiments.

The universal equilibrium range idea of Kolmogorov does not apply Scale disparity and spectral transfer in anisotropic numerical turbulence book the highest Reynolds numbers available.

By contrast, the equilibrium similarity hypothesis of George is in Cited by: 2. The dynamics of spectral transfer in a model of drift wave turbulence with two nonlinearities D. Newman and P. Terry Department of Physics, University of. Zhou, P. Yeung and James G Brasseur,"Scale disparity and spectral transfer in anisotropic numerical turbulence", Physics Review E, 53, (1), pp.

Lin, James G Brasseur, P. Pouderoux and P. Kahrilas,"The phrenic Scale disparity and spectral transfer in anisotropic numerical turbulence book Distal esophagus or potential hiatal hernia?", American Journal of Physiology - Gastrointestinal. grid turbulence were recently compared with results from a di-rect numerical simulation (DNS) of homogeneous isotropic tur-bulence [5].

The comparison highlighted the difﬁculty of speci-fying an adequate spatial domain for numerical and experimen-tal studies so that an accurate determination of integral length is obtained. The scale properties of anisotropic and isotropic turbulence in the urban surface layer are investigated.

A dimensionless anisotropic tensor is introduced and the turbulent tensor anisotropic coefficient, defined as C, where \(C = 3d_{3}\,+\,1 (d_{3}\) is the minimum eigenvalue of the tensor) is used to characterize the turbulence anisotropy or by: 5.

Note that a “low-Reynolds number” type wall correction is used for the spectral transfer coefficients in the current work that approaches the spectral transfer rates (C 1 = and C 2 = ) used for the decay of isotropic turbulence (Bolotnov et Scale disparity and spectral transfer in anisotropic numerical turbulence book, a) and uniform shear flow (Bolotnov et al., b).Cited by: 1.

Sukoriansky, S., B. Galperin and I. Staroselsky, A quasi-normal scale elimination model of turbulent flows with stable stratification. Physics of Fluids, 17, –1–28, Sukoriansky, S., B. Galperin, and V. Perov, Application of a new spectral theory of stably stratified.

Small-Scale Statistics and Structure of Turbulence – in the Light of High Resolution Direct Numerical Simulation Yukio Kaneda and Koji Morishita Introduction Fully developed turbulence is a phenomenon involving huge numbers of de-grees of dynamical freedom.

The motions of a turbulent ﬂuid are sensitiveFile Size: KB. from anisotropic contributions and different anisotropic contributions among themselves. •Dynamical importance through the “foliation” mechanism of the eqs.

of motion. •(i) Power law behaviour only in separated (j) sectors; (ii) intermittency also in anisotropic sectors, (iii). We experimentally investigate scale-to-scale anisotropy from the integral to the dissipative scales in homogeneous turbulence.

We employ an apparatus in which two facing arrays of randomly actuated air jets generate turbulence with negligible mean flow and shear, over a volume several times larger than the energy-containing eddy by: 7.

mogeneous Scale disparity and spectral transfer in anisotropic numerical turbulence book anisotropic turbulence by direct numerical simulations of the Navier–Stokes equations in a periodic box.

Previous numerical studies have been limited to either homogeneous and isotropic turbulence15,16 or to shell models of the energy cascade.

energy-transfer spectra for some of the same flow fields are presented in figures 10 and Because turbulence is intermittent, one might expect some fluctuations in the time-dependent spectra of a finite sample.

In our simulations the turbulent length scale L (see eq. 16b) is the size of the periodic box, so the sample size is veryFile Size: 1MB. Spectral structure of stratiﬁed turbulence: direct numerical simulations and predictions by large eddy simulation we propose a subgrid-scale turbulence model for large eddy simulations of stratiﬁed ﬂows based on the Adaptive Local Deconvolution Method (ALDM).

Turbulence in a box: quantification of large-scale resolution effects in isotropic turbulence free decay - Volume - M. Meldi, P. Sagaut Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our by: 8.

Statistical properties of decaying geostrophic turbulence 20 1 The operator J in (1) is the horizontal Jacobian, and it represents horizontal advection. N(z) is the non-dimensional Brunt-Vaisala frequency (i.e.

the vertical gradient of the mean density profile). t is the temporal coordinate. The horizontal coordinates are x and y, their range isCited by: We found experimentally a dependence of the integral length scales of correlation functions measured in different directions in a turbulent flow on the velocity fluctuation anisotropy in those same directions.

We derive invariants for anisotropic turbulence that is locally isotropic, and so a relationship between the velocity and length scales. The results emphasize the importance of defining Cited by: mental and numerical anisotropic turbulence at ﬁnite Reynolds numbers with ﬁnite scale range (see, e.g., [1,2] and the references cited therein).

The small scale aniso-tropy in turbulence is a theoretical challenge. The detailed information on the anisotropic process of energy transfer, in particular that in the inertial subrange, should be. Definition of spectral non-equilibrium property in homogeneous isotropic turbulence Presently there exist different definitions of the non-equilibrium turbulence.

Some researchers define non-equilibrium as the imbalance between the maximum non-linear energy transfer and the dissipation [8], [12], [13], [14], for example the free-decaying Cited by: PHYSICS OF FLU () Constrained multi-scale turnover Lagrangian map for anisotropic synthetic turbulence: A prioritests Yi Li1,a) and Carlos Rosales2,b) 1School of Mathematics and Statistics, University of Shefﬁeld, Shefﬁeld S3 7RH, United Kingdom 2Department of Mechanical Engineering, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile.

basin will also contribute to and affect the large-scale ﬂow structures. Numerical studies of 2D turbulence in square, rectangu-lar, and circular domains are so far hampered by the compu-tational costs. Moreover, the statistical and spectral analysis is not straightforward due to anisotropy and inhomogeneity induced by the lateral by: 5.

title = "Measuring anisotropy ellipse of atmospheric turbulence by intensity correlations of laser light", abstract = "An experimental study has been performed of a laser beam propagating horizontally through the near-ground atmosphere above a grassy field at the University of Miami (UM) Coral Gables by: The influence of turbulence structure, parameterized by two point correlations, on the return-to-isotropy process is examined under controlled conditions.

In order to determine the influence of structure, direct numerical simulations (DNS) of return-to-isotropy in homogeneous, anisotropic turbulence is performed on meshes of and xxAuthor: Christopher J Zusi. Turbulence Kinetic Energy Specific Dissipation Rate Closure Coefficients and Auxilary Relations References.

Wilcox, D.C. (), "Re-assessment of the scale-determining equation for advanced turbulence models", AIAA Journal, vol. 26, no. 11, pp. Theoretical and experimental investigations have shown that the atmospheric turbulence exhibits both anisotropic and non-Kolmogorov properties.

In this work, two theoretical atmosphere refractive-index fluctuations spectral models are derived for optical waves propagating through anisotropic non-Kolmogorov atmospheric turbulence. They consider simultaneously the finite turbulence inner and.

The integral scale in homogeneous isotropic turbulence 0 5 10 15 20 25 30 k E time = Figure1.E(k) versus kfor the Wray () DNS data. to be correct, then show that the measurements can be accounted for by considering the contribution of the largest scales which the experiments.

transfer of energy is caused by the interaction of vortices with similar sizes. There is, however, no explicit length scale in the vorticity equation in physical space.

This suggests that a multi-scale method based on transforms with basis functions that are localized both in Fourier space and physical space is required (e.g.

Meneveau vortex lines by the large-scale field is allowed, which is not the case for the present model. Evidence that structures of this type are characteristic of the small scales of isotropic turbulence is provided by the numerical simulations of Kerr,3 Ashurst et a1.,4 Vincent and Meneguzzi,5 and oth.

Title: Anisotropy and non-universality in scaling laws of the large scale energy spectrum in rotating turbulence Authors: Amrik Sen, Pablo D. Mininni, Duane Rosenberg, Annick pouquet (Submitted on 22 Mar (v1), last revised 5 Apr (this version, v2))Cited by: turbulence energy is mostly associated with the larger eddies.

Turbulence Lengthscales and Spectra /12 13 / 18 Kolmogorov Model I Based on empirical observations and dimensional analysis, the Kolmogorov model allows us to derive some quantitative rela tions for the spectral densities of k and e.

I The model is based on the following File Size: KB. The buoyant spectral tensor model is driven via five parameters: the viscous dissipation rate ε, length scale of energy-containing eddies L, a turbulence anisotropy parameter, gradient Richardson number (Ri) representing the local atmospheric stability, and the rate of destruction of temperature variance.

Model output includes velocity and Cited by: 7. We generalize a recently introduced model for nonclassic turbulent spatial power spectrum involving anisotropy along two mutually orthogonal axes transverse to the direction of beam propagation by including two scale-dependent weighting factors for these directions.

Such a turbulent model may be pertinent to atmospheric fluctuations in the refractive index in stratified regions well above the. Rapidly rotating turbulent flow is characterized by the emergence of columnar structures that are representative of quasi-two dimensional behavior of the flow.

Large Scale Numerical Simulation for Super uid Turbulence VOL. 2, OCTOBER also true in superfluid case, we investigate the size depen-dence of the incompressible kinetic energy spectrum Ei kin(k,t).

Figure 2 shows an inter-comparison of the in-compressible kinetic energy spectrum Ei kin(k,t) among 3, 3, 1, and 2, In addition, we report an interesting phenomenon relating to turbulence eddy orientation near the ground.

We confirmed that the experimental results are in agreement with the numerical simulations based on the multiple phase-screen method. Our findings provide an efficient method of determining the anisotropic parameters of atmospheric by: Direct-numerical-simulation-based measurement of the mean impulse response of homogeneous isotropic turbulence Marco Carini* and Maurizio Quadrio† Dipartimento di Ingegneria Aerospaziale, Politecnico di Milano, Campus Bovisa, Via La M Milano, Italy.

Y.H. ZHAO, Y.X. ZHANG, QIU WANG, AVERAGE POLARIZATION OF ELECTROMAGNETIC GAUSSIAN SCHELL-MODEL an effective anisotropic factor, κ0 = 2π/L0, L0 is the outer scale of turbulence, Cn 2 is the generalized refractive-index structure parameter with units m3 – α, κ H = c(α)/l0, l0 is the inner scale of turbulence, andCited by: 5.

Scaling exponents in anisotropic hydrodynamic turbulence Victor S. L’vov,1 Itamar Procaccia,1 and Vasil Tiberkevich1,2 1Department pdf Chemical Physics, The Weizmann Institute of Science, RehovotIsrael 2Radiophysical Faculty, National Taras Shevchenko University of Kiev, Kiev, Ukraine ~Received 4 July ; published 19 February !

In anisotropic turbulence, the correlation.`Turbulence in Fluids will serve download pdf a graduate-text to follow up ' Pageoph `The book that Professor Lesieur has written on turbulence is an irreplaceable subject.

Lesieur's work mixes rigor and intuition. it is the spirit in which it is written that is striking. Moreover the book is attractively : Paperback.Traditionally spectral methods in ebook dynamics were used in direct and large eddy simulations of turbulent ebook in simply connected computational domains.

The methods are now being applied to more complex geometries, and the spectral/hp element method, which incorporates both multi-domain spectral methods and high-order finite element methods, has been particularly successful.