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Thematische Bibliographien / Turbulence suppression

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Auswahl der wissenschaftlichen Literatur zum Thema „Turbulence suppression“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 13. Februar 2022

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Zeitschriftenartikel zum Thema "Turbulence suppression"

1

Reis, J. C., und C. H. Kruger. „Turbulence suppression in combustion-driven magnetohydrodynamic channels“. Journal of Fluid Mechanics 188 (März 1988): 147–57. http://dx.doi.org/10.1017/s0022112088000679.

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The effects of a magnetic field on core turbulence, mean-velocity boundary-layer profiles, turbulence-intensity boundary-layer profiles and turbulent spectral-energy distributions have been experimentally determined for combustion-driven magneto-hydrodynamic (MHD) flows. The turbulence suppression of the core was found to be similar to that of liquid-metal MHD flows, even though the turbulent structure was entirely different. The mean-velocity and turbulence-intensity boundary-layer profiles were affected much less than those of liquid-metal flows, primarily because the low-temperature thermal boundary layer reduced the electrical conductivity near the wall. No spectral dependence of turbulence suppression was observed in the core.

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VAITHIANATHAN, T., ASHISH ROBERT, JAMES G. BRASSEUR und LANCE R. COLLINS. „Polymer mixing in shear-driven turbulence“. Journal of Fluid Mechanics 585 (07.08.2007): 487–97. http://dx.doi.org/10.1017/s0022112007007033.

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We investigate numerically the influence of polymer mixing on shear-driven turbulence. Of particular interest is the suppression of mixing that accompanies drag reduction with dilute polymer solutions. The simulations use the finite extensible nonlinear elastic model with the Peterlin closure (FENE-P) to describe the polymer stresses in the momentum equation, with polymer concentration allowed to vary in space and time. A thin slab of concentrated polymer was placed in an initially Newtonian homogeneous turbulent shear flow on a plane perpendicular to the mean velocity gradient, and allowed to mix in the gradient direction while actively altering the turbulence. The initially higher concentration of polymer near the centreplane suppressed production of turbulent kinetic energy and Reynolds stress in that region, while turbulence outside the polymer-rich region remained shear-dominated Newtonian turbulence. The rate of mixing in the shear direction was severely damped by the action of the polymer compared to a passive scalar in the corresponding Newtonian turbulent shear flow. This, in part, was a result of the same damping of vertical velocity fluctuations by the polymer that leads to the suppression of momentum flux. However, the cross-correlation between the polymer concentration and vertical velocity fluctuations was also suppressed, indicating that the explanation for the reduction in polymer mixing involves both the suppression of vertical velocity fluctuations and an alteration of turbulence structure by the polymer–turbulence interactions.

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Dai, Qi, Kun Luo, Tai Jin und Jianren Fan. „Direct numerical simulation of turbulence modulation by particles in compressible isotropic turbulence“. Journal of Fluid Mechanics 832 (26.10.2017): 438–82. http://dx.doi.org/10.1017/jfm.2017.672.

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In this paper, a systematic investigation of turbulence modulation by particles and its underlying physical mechanisms in decaying compressible isotropic turbulence is performed by using direct numerical simulations with the Eulerian–Lagrangian point-source approach. Particles interact with turbulence through two-way coupling and the initial turbulent Mach number is 1.2. Five simulations with different particle diameters (or initial Stokes numbers, $St_{0}$) are conducted while fixing both their volume fraction and particle densities. The underlying physical mechanisms responsible for turbulence modulation are analysed through investigating the particle motion in the different cases and the transport equations of turbulent kinetic energy, vorticity and dilatation, especially the two-way coupling terms. Our results show that microparticles ($St_{0}\leqslant 0.5$) augment turbulent kinetic energy and the rotational motion of fluid, critical particles ($St_{0}\approx 1.0$) enhance the rotational motion of fluid, and large particles ($St_{0}\geqslant 5.0$) attenuate turbulent kinetic energy and the rotational motion of fluid. The compressibility of the turbulence field is suppressed for all the cases, and the suppression is more significant if the Stokes number of particles is close to 1. The modifications of turbulent kinetic energy, the rotational motion and the compressibility are all related with the particle inertia and distributions, and the suppression of the compressibility is attributed to the preferential concentration and the inertia of particles.

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KANEDA, YUKIO, und TAKAKI ISHIDA. „Suppression of vertical diffusion in strongly stratified turbulence“. Journal of Fluid Mechanics 402 (10.01.2000): 311–27. http://dx.doi.org/10.1017/s0022112099007041.

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A spectral approximation for diffusion of passive scalar in stably and strongly stratified turbulence is presented. The approximation is based on a linearized approximation for the Eulerian two-time correlation and Corrsin's conjecture for the Lagrangian two-time correlation. For strongly stratified turbulence, the vertical component of the turbulent velocity field is well approximated by a collection of Fourier modes (waves) each of which oscillates with a frequency depending on the direction of the wavevector. The proposed approximation suggests that the phase mixing among the Fourier modes having different frequencies causes the decay of the Lagrangian two-time vertical velocity autocorrelation, and the highly oscillatory nature of these modes results in the suppression of single-particle dispersion in the vertical direction. The approximation is free from any ad hoc adjusting parameter and shows that the suppression depends on the spectra of the velocity and fluctuating density fields. It is in good agreement with direct numerical simulations for strongly stratified turbulence.

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ROBERT, ASHISH, T. VAITHIANATHAN, LANCE R. COLLINS und JAMES G. BRASSEUR. „Polymer-laden homogeneous shear-driven turbulent flow: a model for polymer drag reduction“. Journal of Fluid Mechanics 657 (28.06.2010): 189–226. http://dx.doi.org/10.1017/s0022112010001394.

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Drag reduction (DR) under a turbulent boundary layer implies the suppression of turbulent momentum flux to the wall, a large-eddy phenomenon. Our hypothesis is that the essential mechanisms by which dilute concentrations of long-chain polymer molecules reduce momentum flux involve only the interactions among turbulent velocity fluctuations, polymer molecules and mean shear. Experiments indicate that these interactions dominate in a polymer-active ‘elastic layer’ outside the viscous sublayer and below a Newtonian inertial layer in a polymer-laden turbulent boundary layer. We investigate our hypothesis by modelling the suppression of momentum flux with direct numerical simulation (DNS) of homogeneous turbulent shear flow (HTSF) and the finite extensible nonlinear elastic with Peterlin approximation (FENE-P) model for polymer stress. The polymer conformation tensor equation was solved using a new hyperbolic algorithm with no artificial diffusion. We report here on the equilibrium state with fixed mean shear rate S, where progressive increases in non-dimensional polymer relaxation time WeS (shear Weissenberg number) or concentration parameter 1 − β produced progressive reductions in Reynolds shear stress, turbulence kinetic energy and turbulence dissipation rate, concurrent with increasing polymer stress and elastic potential energy. The changes in statistical variables underlying polymer DR with 1 − β, WeS, %DR and polymer-induced changes to spectra are similar to experiments in channel and pipe flows and show that the experimentally measured increase in normalized streamwise velocity variance is an indirect consequence of DR that is true only at lower DR. Comparison of polymer stretch and elastic potential energy budgets with channel flow DNS showed qualitative correspondence when distance from the wall was correlated to WeS. As WeS increased, the homogeneous shear flow displayed low-DR, high-DR and maximum-DR (MDR) regimes, similar to experiments, with each regime displaying distinctly different polymer–turbulence physics. The suppression of turbulent momentum flux arises from the suppression of vertical velocity fluctuations primarily by polymer-induced suppression of slow pressure–strain rate correlations. In the high-Weissenberg-number MDR-like limit, the polymer nearly completely blocks Newtonian inter-component energy transfer to vertical velocity fluctuations and turbulence is maintained by the polymer contribution to pressure–strain rate. Our analysis from HTSF with the FENE-P representation of polymer stress and its comparisons with experimental and DNS studies of wall-bounded polymer–turbulence supports our central hypothesis that the essential mechanisms underlying polymer DR lie directly in the suppression of momentum flux by polymer–turbulence interactions in the presence of mean shear and indirectly in the presence of the wall as the shear-generating mechanism.

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Reiser, D., und M. Z. Tokar. „Turbulence Suppression in Transport Barriers“. Fusion Science and Technology 45, Nr. 2T (März 2004): 346–53. http://dx.doi.org/10.13182/fst04-a500.

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Farrell, Brian F., und Petros J. Ioannou. „Turbulence suppression by active control“. Physics of Fluids 8, Nr. 5 (Mai 1996): 1257–68. http://dx.doi.org/10.1063/1.868897.

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KOMOSHVILI, K., S. CUPERMAN und C. BRUMA. „Plasma-turbulence suppression and transport-barrier formation by externally driven radiofrequency waves in spherical tokamaks“. Journal of Plasma Physics 65, Nr. 3 (April 2001): 235–53. http://dx.doi.org/10.1017/s0022377801001015.

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Turbulent transport of heat and particles is the principle obstacle confronting controlled fusion today. We investigate quantitatively the suppression of turbulence and formation of transport barriers in spherical tokamaks by sheared electric fields generated by externally driven radiofrequency (RF) waves, in the frequency range ωA ∼ ω < ωci (where ωA and ωci are the Alfvén and ion cyclotron frequencies).This investigation consists of the solution of the full-wave equation for a spherical tokamak in the presence of externally driven fast waves and the evaluation of the power dissipation by the mode-converted Alfvén waves. This in turn provides a radial flow shear responsible for the suppression of plasma turbulence. Thus a strongly nonlinear equation for the radial sheared electric field is solved, and the turbulent transport suppression rate is evaluated and compared with the ion temperature gradient (ITG) instability increment.

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Zhilenko, D. Yu, und O. E. Krivonosova. „Suppression of Turbulence in Rotational Flows“. Technical Physics Letters 45, Nr. 9 (September 2019): 870–73. http://dx.doi.org/10.1134/s1063785019090141.

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Minnie, J., J. W. Bieber, W. H. Matthaeus und R. A. Burger. „Suppression of Particle Drifts by Turbulence“. Astrophysical Journal 670, Nr. 2 (Dezember 2007): 1149–58. http://dx.doi.org/10.1086/522026.

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Dissertationen zum Thema "Turbulence suppression"

1

KANEDA, YUKIO, und TAKAKI ISHIDA. „Suppression of vertical diffusion in strongly stratified turbulence“. Cambridge University Press, 2000. http://hdl.handle.net/2237/10288.

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Jahn, Jiří. „Potlačení turbulentního proudění v potrubí“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444297.

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This thesis deals with ways to suppress turbulent flow in pipelines. In the first part various methods of laminarization are presented, when the turbulent flow is transformed into laminar flow, including the results of experiments published by the authors. The next part presents the results from CFD. The calculations were performed for one of the methods mentioned in the first part and the results were compared with each other. In addition, several options have been suggested to improve the original method.

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Heath, Kristy Marie. „Fluid Mud Formation in the Petitcodiac River, New Brunswick, Canada“. Thesis, Boston College, 2009. http://hdl.handle.net/2345/922.

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Thesis advisor: Gail C. Kineke
Experiments were conducted in the Petitcodiac River in New Brunswick, Canada during June and August 2006 to study high-concentrations of suspended sediment in a turbulent system. This study will evaluate the conditions necessary for fluid mud formation by investigating 1) the suppression of turbulence at gradient Richardson numbers greater than 0.25; 2) a threshold condition for the amount of sediment a flow can maintain in a turbulent suspension; and 3) the influence of flocculation on vertical suspended-sediment transport. Direct measurements of salinity, temperature, current velocity, and suspended-sediment concentration were collected during accelerating and decelerating flows and when fluid mud formed. In June, current velocities were typically above 1 m s-1 and suspended-sediment concentrations were generally less than 10 g l -1. In August, current velocities were typically less than 1.5 m s-1, suspended-sediment concentrations were greater than 10 g l -1, and a high-concentration bottom layer formed rapidly during decelerating flood currents. Gradient Richardson numbers for concentrations greater than 10 g l -1 were generally greater than 0.25, suggesting strong density gradients have the ability to suppress turbulence. Results from the Petitcodiac suggest a carrying capacity threshold might exist, but is based on a critical gradient Richardson number between 1.0 and 2.0 rather than the previously accepted value of 0.25. Differences in the evolution of disaggregated grain size distributions for settling suspensions suggest flocculation plays an important role for fluid mud formation by enhancing settling of fine sediments
Thesis (MS) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics

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„A metric compilation analysis of terrestrial atmospheric turbulence suppression algorithms for use in long range digital video surveillance“. Thesis, 2012. http://hdl.handle.net/10210/5693.

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M.Ing.
Atmospheric turbulence (also referred to as optical or heat Scintillation, or heat shimmer) is a particular problem encountered in video surveillance, especially over distances where the target object focused on is over lkm in the distance. Images obtained from video surveillance are commonly required to be of a high quality for object identification and classification. Atmospheric turbulence causes degradation in the image quality through the blurring and a warping of the image, making object identification difficult. Algorithms have and still are being developed to suppress the image turbulence in digital video footage and enhance detail. There is a lack of reliable comparisons among algorithms to provide research direction, methods for identification of the best algorithms for particular applications, identification of useful image processing techniques and a full understanding of the problem. This need and lack of comparisons among the algorithms and atmospheric turbulence degraded videos is identified through the problem identification chapter. A literature study is undertaken in which the source of atmospheric turbulence and models are identified, image processing techniques discussed, filtering of electromagnetic waves reviewed, a review of some equipment, and a discussion of metrics. This is followed by the presentation of a number of atmospheric turbulence suppression algorithms developed by other authors. After a discussion of the algorithm implementations, the experimental design is described for algorithm image quality and performance investigation as well as the effect of optical filters. Experimental results are presented and discussed which provide repeatable results pertaining to the algorithms' image quality and processing requirements. The results allowed identification of the algorithms' strengths and weaknesses, how they compare, and their suitability for real and post processing environments. Efficient performing software components were also able to be identified, particularly Illuminance-Reflectance adjustment. The experiments and results provide a solution to this atmospheric turbulence comparison problem.

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Hung, Chu-Hsiang, und 洪楚翔. „Numerical Study of Turbulent Distribution and Noise Suppression in the Gas Turbine Engine Exhaust Pipe“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/xrk3wb.

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碩士
國立虎尾科技大學
飛機工程系航空與電子科技碩士班
105
In the requirements of the airport environment. At present the engine noise is one of the important factors affecting the environment, noise reduction equipment is necessary. The main noise of the engine is related to the degree of mixing of the discharged high-temperature high-speed jet with the external low-speed cold air. To reduce the noise, it is necessary to improve the mixing ratio of the internal flow and outside air. Therefore, this study discusses how to improve the appearance of the same exhaust area, which can achieve the same exhaust air volume and reduce the noise effect. In this study, CFD software Fluent was used for simulation. In order to improve its accuracy. First, the simulated and experimental data were compared for their sound pressure levels. After validation, a thrust eight-thousand-pound jet engine was used as the prototype design. And discuss the influence of three kinds of appearance changes. Have Wave, Chevron and Fold types. To investigate the distribution of appearance change after the tail section of the air flow turbulence and noise situation. The Chevron - type tail pipe has the best noise reduction effect. Noise reduction effect is about 8-13dB.

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Bücher zum Thema "Turbulence suppression"

1

Grigoryev, Yurii N., und Igor V. Ershov. Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3.

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Cuperman, Sami. Alternative, cheap and safe energy generation by the fusion of heavy hydrogen isotopes: Suppression of the plasma turbulence and transport in the late, pre-ignition stage of the advancd spherical tokamaks, by externally induced electric field barriers : annual report for the period 1.10.2000 - 30.9.2001. [Jerusalem]: State of Israel, Ministry of National Infrastructures, Division of Research and Development, 2001.

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Grigoryev, Yurii N., und Igor V. Ershov. Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows. Springer, 2018.

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4

On the mechanism of turbulence suppression in free shear flows under acoustic excitation. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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5

Ejector noise suppression with auxiliary jet injection: Under contract NAS3-27246. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Ejector noise suppression with auxiliary jet injection: Under contract NAS3-27246. [Washington, DC: National Aeronautics and Space Administration, 1997.

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7

Cheney, Phil, und Andrew Sullivan. Grassfires. CSIRO Publishing, 2008. http://dx.doi.org/10.1071/9780643096493.

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Grassfires: Fuel, Weather and Fire Behaviour presents information from CSIRO on the behaviour and spread of fires in grasslands. This second edition follows over 10 years of research aimed at improving the understanding of the fundamental processes involved in the behaviour of grassfires. The book covers all aspects of fire behaviour and spread in the major types of grasses in Australia. It examines the factors that affect fire behaviour in continuous grassy fuels; fire in spinifex fuels; the effect of weather and topography on fire spread; wildfire suppression strategies; and how to reconstruct grassfire spread after the fact. The three meters designed by CSIRO for the prediction of fire danger and rate of spread of grassfires are explained and their use and limitations discussed. This new edition expands the discussion of historical fires including Aboriginal burning practices, the chemistry of combustion, and the structure of turbulent diffusion flames. It also examines fire safety, including the difficulty of predicting wind strength and direction and the impact of threshold wind speed on safe fire suppression. Myths and fallacies about fire behaviour are explained in relation to their impact on personal safety and survival. Grassfires will be a valuable reference for rural fire brigade members, landholders, fire authorities, researchers and those studying landscape and ecological processes.

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Bennett, Kate. John Aubrey’s and Life-Writing. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199935338.013.14.

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John Aubrey constructed an intimate and nonthreatening biographical persona, which allowed him to collect sensitive material about people in a politically turbulent period. He preserved documents and facts, but also anecdotes and “sayings,” as records of the human voice and the reputations of biographical subjects. He developed an expectation that comprehensive and factual biographical reference works were necessary, and that biography could be an aspect of social or historical knowledge. He wrote the lives of women and of those who were not privileged, rejecting the exemplary tradition and writing sympathetically about ordinary people. When writing the life of Hobbes, he disagreed with his collaborator, Dryden, about the nature of biography, which Dryden saw as a neoclassical rhetorical art, requiring the suppression of ignominious or inelegant facts and creation of a pantheon of eminence. Aubrey created a new form, fame for disillusioned times, with modern values and a respect for fact.

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Landis, Erik. Bolshevism enforced, 1917–1921. Herausgegeben von Simon Dixon. Oxford University Press, 2013. http://dx.doi.org/10.1093/oxfordhb/9780199236701.013.021.

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How could the Bolsheviks exert control over Russia between October 1917 and 1921 when the Provisional Government had failed to do so after the February Revolution? This chapter reassesses those turbulent years through the prism of centre-periphery conflict and state-building, arguing that the process of civil war served to extend Soviet control through the elimination of armed rivals and the suppression of the centrifugal social forces accentuated by revolution in 1917. If the Provisional Government sought to govern at a time when state sovereignty was disintegrating, the civil war was, to a large extent, a struggle for re-integration—a struggle characterized by the projection of armed force and the exercise of violence against civilians. Military domination of the countryside proved a necessary condition for the medium-term socialization of formerly insurgent populations who initially harboured strong grievances against the new Soviet state.

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Doughan, Christopher. The Voice of the Provinces. Liverpool University Press, 2019. http://dx.doi.org/10.3828/liverpool/9781786942258.001.0001.

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This book provides a comprehensive depiction of Ireland’s regional press during the turbulent years leading up to the foundation of the Irish Free State following the Anglo-Irish Treaty of 1921. It investigates the origins of the regional papers that reported this critical period of Irish history and profiles the personalities behind many of these publications. Furthermore, this book presents case studies of seventeen newspapers – nationalist, unionist, and independent – across the four provinces of Ireland. These case studies not only detail the history of the respective newspapers but also closely scrutinises the editorial commentary of each publication between 1914 and 1921. Consequently, a thorough analysis of how each of these regional titles responded to the many dramatic developments during these years is provided. This includes seminal events such as the outbreak of World War I, the Easter Rising of 1916, the rise of the Sinn Féin party, the War of Independence, and the Anglo-Irish Treaty of 1921. During this time many of Ireland’s regional newspaper titles faced censorship, suppression, and in some cases, violent attack on their premises that threatened their livelihood. In some instances, newspaper owners, editors, and their staff were arrested and imprisoned. Their experiences during these years are meticulously detailed in this book.

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Buchteile zum Thema "Turbulence suppression"

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Derzhavina, A. I., O. S. Ryzhov und E. D. Terent’ev. „Suppression of Unstable Oscillations in a Boundary Layer“. In Turbulence Management and Relaminarisation, 271–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83281-9_20.

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Miura, Hideaki. „Suppression of Vortical Motions in Compressible Isotropic Turbulence“. In IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, 237–40. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-0997-3_40.

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Shoda, Munehito. „Onset and Suppression of Parametric Decay Instability“. In Fast Solar Wind Driven by Parametric Decay Instability and Alfvén Wave Turbulence, 37–50. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1030-1_3.

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Grigoryev, Yurii N., und Igor V. Ershov. „Physico-Mathematical Models of Relaxing Molecular Gas Flows“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 1–34. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_1.

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Grigoryev, Yurii N., und Igor V. Ershov. „Linear Stability of Inviscid Plane-Parallel Flows of Vibrationally Excited Diatomic Gases“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 35–49. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_2.

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Grigoryev, Yurii N., und Igor V. Ershov. „Linear Stability of Supersonic Plane Couette Flow of Vibrationally Excited Gas“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 51–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_3.

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Grigoryev, Yurii N., und Igor V. Ershov. „Asymptotic Theory of Neutral Linear Stability Contours in Plane Shear Flows of a Vibrationally Excited Gas“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 85–109. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_4.

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Grigoryev, Yurii N., und Igor V. Ershov. „Energy Theory of Nonlinear Stability of Plane Shear Flows of Thermally Nonequilibrium Gas“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 111–51. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_5.

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Grigoryev, Yurii N., und Igor V. Ershov. „Evolution of a Large-Scale Vortex in Shear Flow of a Relaxing Molecular Gas“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 153–69. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_6.

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Grigoryev, Yurii N., und Igor V. Ershov. „Dissipation of the Kelvin–Helmholts Waves in a Relaxing Molecular Gas“. In Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows, 171–98. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55360-3_7.

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Konferenzberichte zum Thema "Turbulence suppression"

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Shawkat, Mohamed E., Chan Y. Ching und Mamdouh Shoukri. „Liquid Turbulence Spectra in Two-Phase Bubbly Flow Under Turbulence Augmentation and Suppression Conditions“. In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98335.

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An experimental investigation was performed in air-water bubbly flow to study the liquid turbulence spectra in a 200mm diameter vertical pipe. A dual optical probe was used to measure the local void fraction and bubble diameter while the liquid velocities were measured using hot-film anemometry. Experiments were performed at two liquid superficial velocities of 0.2 and 0.68m/s for gas superficial velocities in the range of 0 to 0.18m/s. Generally, as the void fraction increases there is a turbulence augmentation. However, a turbulence suppression was observed near the pipe wall at the higher liquid flow rate for low void fraction. In the augmentation case, the turbulence spectra showed a significant increase in the energy at the wave number range comparable to the bubble diameter. In the suppression case, the spectra showed that suppression initially occurs at the low wave number range and then extends to higher wave numbers as suppression increased.

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Bird, James W., Matthew J. Santer und Jonathan F. Morrison. „Adaptive Kagome Lattices for Near Wall Turbulence Suppression“. In 23rd AIAA/AHS Adaptive Structures Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-0270.

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3

Wang, Jin, Xiuhua Yuan und Dexiu Huang. „Suppression of turbulence noise in optical wireless communication system“. In Asia-Pacific Optical Communications, herausgegeben von Cedric F. Lam, Wanyi Gu, Norbert Hanik und Kimio Oguchi. SPIE, 2005. http://dx.doi.org/10.1117/12.575709.

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4

Walters, B. D., und W. A. Clarke. „Comparison of two terrestrial atmospheric turbulence suppression algorithms (March 2007)“. In AFRICON 2007. IEEE, 2007. http://dx.doi.org/10.1109/afrcon.2007.4401539.

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5

Parker, S. E., J. J. Kohut, Y. Chen, Z. Lin, F. L. Hinton und W. W. Lee. „Fine-Scale Zonal Flow Suppression of Electron Temperature Gradient Turbulence“. In THEORY OF FUSION PLASMAS: Joint Varenna-Lausanne International Workshop. AIP, 2006. http://dx.doi.org/10.1063/1.2404551.

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6

Jovanovic, M. R. „Turbulence suppression in channel flows by small amplitude transverse wall oscillations“. In 2006 American Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/acc.2006.1656374.

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7

Davis, Jefferson, Sparsh Ganju, Neil Ashton, Sean Bailey und Christoph Brehm. „A DNS Study to Investigate Turbulence Suppression in Rotating Pipe Flows“. In AIAA Aviation 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-3639.

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8

Seena, Abu, Donghyung Lee und Juyoul Kim. „Suppression of Low Energy Natural Modes of Pipe for Mitigation of Turbulence Induced Vibration“. In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93696.

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Annotation:

Abstract Turbulence induced vibrations are most commonly encountered in industrial piping’s. Several guidelines are available for knowhow and its mitigation in piping designs and acceptable limits of vibration beyond which fatigue failure may occur in pipes. In present paper, it has been emphasized to predict potential turbulence induced vibrations at Design Stage rather than to have the expensive trouble-shooting solutions after the fabrication of system. The detailed review of currently available methods for assessing flow-induced vibrations in piping systems, including current limitations in existing codes and guidelines are discussed. These limitations are centered on the empirical approach currently taken in codes and guidelines. In present paper, a rational approach has been proposed in which the turbulent kinetic energy of the fluid flow is compared against the kinetic energy required to vibrate the pipe beyond its allowable level of vibration. The proposed method has been accessed using a documented case study. The parameters needed to evaluate the relative energies of vibration to turbulent kinetic energy of the fluid flow can be determined from FEA software, which make the present approach practically feasible for the mitigation at design stage.

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9

Arakeri, V., A. Krothapalli, V. Siddavaram, M. B. Alkislar und L. Lourenco. „Turbulence Suppression in the Noise Producing Region of a M = 0.9 Jet“. In 8th AIAA/CEAS Aeroacoustics Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2523.

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10

Zubair, Fazlul, Aaron Freeman, Siarhei Piatrovich, Jennifer Shockro, Youssef Ibrahim und Haris Catrakis. „Large Scale Turbulence Suppression Control for Direct Reduction of Aero-Optical Aberrations“. In 38th Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-4008.

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Berichte der Organisationen zum Thema "Turbulence suppression"

1

Sugama, H., und W. Horton. Transport suppression by shear flow generation in multihelicity resistive-g turbulence. Office of Scientific and Technical Information (OSTI), November 1993. http://dx.doi.org/10.2172/10125476.

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2

Beer, M. A., R. V. Budny, C. D. Challis und G. Conway. Turbulence suppression by E x B shear in JET optimized shear pulses. Office of Scientific and Technical Information (OSTI), Januar 2000. http://dx.doi.org/10.2172/750156.

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3

Biglari, H., M. Ono, P. H. Diamond und G. G. Craddock. Flow shear suppression of turbulence using externally driven ion Bernstein and Alfven waves. Office of Scientific and Technical Information (OSTI), Januar 1992. http://dx.doi.org/10.2172/5794383.

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4

Biglari, H., M. Ono, P. H. Diamond und G. G. Craddock. Flow shear suppression of turbulence using externally driven ion Bernstein and Alfven waves. Office of Scientific and Technical Information (OSTI), Januar 1992. http://dx.doi.org/10.2172/10119123.

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5

Gmurczyk, Grzegorz, und William L. Grosshandler. Suppression of high speed turbulent flames in a detonationdeflagration tube. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5642.

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