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Author : D. R. Ballal
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (473 download)
Download or read book The decay of high intensity isotropic turbulence written by D. R. Ballal and published by . This book was released on 1971 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Timothy William Koster
Publisher :
ISBN 13 : 9781339230917
Total Pages : 88 pages
Book Rating : 4.2/5 (39 download)
Download or read book The Power Decay Law in High Intensity Active Grid Generated Turbulence written by Timothy William Koster and published by . This book was released on 2015 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented herein provides an assessment of the applicability of the power law decay of turbulent kinetic energy in the isotropic and homogeneous region in a high intensity flow generated by an active grid. Two sets of indicators and data collected at mean velocities of 4, 6 and 8 m/s are used to determine the isotropic region. Results of this study are inconsistent as some of the results are consistent with a power law behavior but some results are not. For example, the ratio of dissipation computed from the time derivative of the velocity, epsilon, to the corresponding value computed using the power law decay for turbulent kinetic energy, epsilon*, should be one. This is indeed the value found for mean velocities of 8 and 6 m s-1 but only when using a range of downstream positions corresponding to only one of the pairs of isotropy indicators. For mean velocity of 4 m s-1, epsilon/epsilon* ≠ 1, nor does it equal 1 for any of the mean velocities for the isotropic range indicated by the second isotropy indicator. An alternative approach for the power decay law is proposed and is based on the determination of the range using the constraint that epsilon/epsilon* = 1.
Author : William Hill Reid
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.:/5 (475 download)
Download or read book On the decay of isotropic turbulence written by William Hill Reid and published by . This book was released on 1954 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781719500807
Total Pages : 72 pages
Book Rating : 4.5/5 (8 download)
Download or read book Parametric Study of Decay of Homogeneous Isotropic Turbulence Using Large Eddy Simulation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical simulations of decaying homogeneous isotropic turbulence are performed with both low-order and high-order spatial discretization schemes. The turbulent Mach and Reynolds numbers for the simulations are 0.2 and 250, respectively. For the low-order schemes we use either second-order central or third-order upwind biased differencing. For higher order approximations we apply weighted essentially non-oscillatory (WENO) schemes, both with linear and nonlinear weights. There are two objectives in this preliminary effort to investigate possible schemes for large eddy simulation (LES). One is to explore the capability of a widely used low-order computational fluid dynamics (CFD) code to perform LES computations. The other is to determine the effect of higher order accuracy (fifth, seventh, and ninth order) achieved with high-order upwind biased WENO-based schemes. Turbulence statistics, such as kinetic energy, dissipation, and skewness, along with the energy spectra from simulations of the decaying turbulence problem are used to assess and compare the various numerical schemes. In addition, results from the best performing schemes are compared with those from a spectral scheme. The effects of grid density, ranging from 32 cubed to 192 cubed, on the computations are also examined. The fifth-order WENO-based scheme is found to be too dissipative, especially on the coarser grids. However, with the seventh-order and ninth-order WENO-based schemes we observe a significant improvement in accuracy relative to the lower order LES schemes, as revealed by the computed peak in the energy dissipation and by the energy spectrum. Swanson, R. C. and Rumsey, Christopher L. and Rubinstein, Robert and Balakumar, Ponnampalam and Zang, Thomas A. Langley Research Center COMPUTATIONAL FLUID DYNAMICS; HOMOGENEOUS TURBULENCE; ISOTROPIC TURBULENCE; LARGE EDDY SIMULATION; PARAMETERIZATION; DIRECT NUMERICAL SIMULATION; ESSENTIALLY NON-OSCILLATORY SCHEMES; ENERGY SPECTRA; NONLINEARITY; MACH N
Author : Institute for Computer Applications in Science and Engineering
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (317 download)
Download or read book The Energy Decay in Self-preserving Isotropic Turbulence Revisited written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 542 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cranfield Institute of Technology
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.E/5 ( download)
Download or read book Cranfield Report Aero written by Cranfield Institute of Technology and published by . This book was released on 1971 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jiajin Qu
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (229 download)
Download or read book Decay Laws of Isotropic Turbulence written by Jiajin Qu and published by . This book was released on 1990 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lawrence Sirovich
Publisher : Springer Science & Business Media
ISBN 13 : 1461231566
Total Pages : 375 pages
Book Rating : 4.4/5 (612 download)
Download or read book New Perspectives in Turbulence written by Lawrence Sirovich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of articles has its origin in a meeting which took place June 12-15, 1989, on the grounds of Salve Regina College in Newport, Rhode Island. The meeting was blessed by beautiful, balmy weather and an idyllic setting. The sessions themselves took place in Ochre Court, one of the elegant and stately old summer cottages for which Newport is acclaimed. Lectures were presented in the grand ballroom overlooking the famous Cliff Walk and Block Island Sound. Counter to general belief, the pleasant surroundings did not appear to encourage truancy or in any other way diminish the quality of the meeting. On the contrary, for the four days of the meeting there was a high level of excitement and optimism about the new perspectives in turbulence, a tone that carried over to lively dinner and evening discussions. The participants represented a broad range of backgrounds, extending from pure mathemat ics to experimental engineering. A dialogue began with the first speakers which cut across the boundaries and gave to the meeting a mood of unity which persisted.
Author : Jean Piquet
Publisher : Springer Science & Business Media
ISBN 13 : 3662035596
Total Pages : 767 pages
Book Rating : 4.6/5 (62 download)
Download or read book Turbulent Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt: obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.
Author : Pauline H. Gurewitz
Publisher :
ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.3/5 (91 download)
Download or read book Hydraulic Research in the United States and Canada, 1974 written by Pauline H. Gurewitz and published by . This book was released on 1976 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stanley Corrsin
Publisher : CRC Press
ISBN 13 : 9780891167471
Total Pages : 256 pages
Book Rating : 4.1/5 (674 download)
Download or read book Advances In Turbulence written by Stanley Corrsin and published by CRC Press. This book was released on 1988-10-01 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a symposium held in June 1986 in Minneapolis, USA, this volume surveys current information on turbulence measurement and modelling, computational fluid mechanics, vortex flow and physical modelling, cavitation and two-phase flow, bluff body flow and fluid structure interaction.
Author : P. Chassaing
Publisher : Springer Science & Business Media
ISBN 13 : 9401700753
Total Pages : 387 pages
Book Rating : 4.4/5 (17 download)
Download or read book Variable Density Fluid Turbulence written by P. Chassaing and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part aims at providing the physical and theoretical framework of the analysis of density variations in fully turbulent flows. Its scope is deliberately educational. In the second part, basic data on dynamical and scalar properties of variable density turbulent flows are presented and discussed, based on experimental data and/or results from direct numerical simulations. This part is rather concerned with a research audience. The last part is more directly devoted to an engineering audience and deals with prediction methods for turbulent flows of variable density fluid. Both first and second order, single point modeling are discussed, with special emphasis on the capability to include specific variable density / compressibility effects.
Author :
Publisher :
ISBN 13 :
Total Pages : 614 pages
Book Rating : 4.3/5 (121 download)
Download or read book Office of Naval Research written by and published by . This book was released on 1987 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert H. Kraichnan
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (227 download)
Download or read book Decay of Isotropic Turbulence in the Directinteraction Approximation written by Robert H. Kraichnan and published by . This book was released on 1963 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct-interaction equations for the decay of isotropic turbulence are integrated numerically with initial spectra of several shapes and initial Reynolds values of R less than or in the vicinity of 40. Results are presented for the evolution with time of total energy, dissipation, energy transfer, skewness factor, and other integral quantities, together with the associated wavenumber spectra. Similarity and self-preservation features of the evolving spectra are exhibited. The results are compared with grid-turbulence measurements by Stewart and Townsend. Results are also given for the timecorrelation of the total velocity at a fixed point in space and for the time-correlation and response functions of individual wavenumber modes. (Author).
Author : Vladimir V. Uchaikin
Publisher : Springer Science & Business Media
ISBN 13 : 3642339115
Total Pages : 400 pages
Book Rating : 4.6/5 (423 download)
Download or read book Fractional Derivatives for Physicists and Engineers written by Vladimir V. Uchaikin and published by Springer Science & Business Media. This book was released on 2013-07-09 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first derivative of a particle coordinate means its velocity, the second means its acceleration, but what does a fractional order derivative mean? Where does it come from, how does it work, where does it lead to? The two-volume book written on high didactic level answers these questions. Fractional Derivatives for Physicists and Engineers— The first volume contains a clear introduction into such a modern branch of analysis as the fractional calculus. The second develops a wide panorama of applications of the fractional calculus to various physical problems. This book recovers new perspectives in front of the reader dealing with turbulence and semiconductors, plasma and thermodynamics, mechanics and quantum optics, nanophysics and astrophysics. The book is addressed to students, engineers and physicists, specialists in theory of probability and statistics, in mathematical modeling and numerical simulations, to everybody who doesn't wish to stay apart from the new mathematical methods becoming more and more popular. Prof. Vladimir V. UCHAIKIN is a known Russian scientist and pedagogue, a Honored Worker of Russian High School, a member of the Russian Academy of Natural Sciences. He is the author of about three hundreds articles and more than a dozen books (mostly in Russian) in Cosmic ray physics, Mathematical physics, Levy stable statistics, Monte Carlo methods with applications to anomalous processes in complex systems of various levels: from quantum dots to the Milky Way galaxy.
