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Analysis Of Existing Lagrangian Models And New Propositions For Particle Dispersion In Homogeneous Stationary Turbulence
Download Analysis Of Existing Lagrangian Models And New Propositions For Particle Dispersion In Homogeneous Stationary Turbulence full books in PDF, epub, and Kindle. Read online Analysis Of Existing Lagrangian Models And New Propositions For Particle Dispersion In Homogeneous Stationary Turbulence ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Analysis of Existing Lagrangian Models and New Propositions for Particle Dispersion in Homogeneous Stationary Turbulence by : J. P. Minier
Download or read book Analysis of Existing Lagrangian Models and New Propositions for Particle Dispersion in Homogeneous Stationary Turbulence written by J. P. Minier and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis One-particle Stochastic Lagrangian Model for Turbulent Dispersion in Horizontally Homogeneous Turbulence by : Orazgeldy Kurbanmuradov
Download or read book One-particle Stochastic Lagrangian Model for Turbulent Dispersion in Horizontally Homogeneous Turbulence written by Orazgeldy Kurbanmuradov and published by . This book was released on 1998 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Stochastic Methods for Predicting Particle Dispersion in Turbulent Flows by : Kyle Paul Sala
Download or read book Analysis of Stochastic Methods for Predicting Particle Dispersion in Turbulent Flows written by Kyle Paul Sala and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current research seeks to develop a computational model that accurately describes particle dispersion in turbulent flow. Current particle dispersion models do not accurately predict the small-scale clumping of particles in turbulent flow that occurs due to interaction with turbulent eddies. A new stochastic vortex structure (SVS) model was developed and compared with current stochastic Lagrangian models (SLM) for turbulent flows. To examine what characteristics of the fluid flow field that lead to dispersion of particles, a number of non trivial measures were used. A discrete-element model is used to transport particle locations for cases with and without adhesive forces. Direct numerical simulations (DNS) are used as a baseline for comparison between the two models. Initial results show that the SVS model matches the spatial structure of the flow field of DNS reasonably well, while the SLMs do not. Investigation of particle collision rate suggest that while SVS matches the large length scales of flow, it omits the smaller scales of the flow.
Book Synopsis Lagrangian Energetics and Vertical Dispersion in Stably Stratified Turbulence by : Seungbum Jo
Download or read book Lagrangian Energetics and Vertical Dispersion in Stably Stratified Turbulence written by Seungbum Jo and published by . This book was released on 2015 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Approaches in Modeling Multiphase Flows and Dispersion in Turbulence, Fractal Methods and Synthetic Turbulence by : F.C.G.A. Nicolleau
Download or read book New Approaches in Modeling Multiphase Flows and Dispersion in Turbulence, Fractal Methods and Synthetic Turbulence written by F.C.G.A. Nicolleau and published by Springer Science & Business Media. This book was released on 2011-10-29 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a collection of the main contributions from the first five workshops held by Ercoftac Special Interest Group on Synthetic Turbulence Models (SIG42. It is intended as an illustration of the sig’s activities and of the latest developments in the field. This volume investigates the use of Kinematic Simulation (KS) and other synthetic turbulence models for the particular application to environmental flows. This volume offers the best syntheses on the research status in KS, which is widely used in various domains, including Lagrangian aspects in turbulence mixing/stirring, particle dispersion/clustering, and last but not least, aeroacoustics. Flow realizations with complete spatial, and sometime spatio-temporal, dependency, are generated via superposition of random modes (mostly spatial, and sometime spatial and temporal, Fourier modes), with prescribed constraints such as: strict incompressibility (divergence-free velocity field at each point), high Reynolds energy spectrum. Recent improvements consisted in incorporating linear dynamics, for instance in rotating and/or stably-stratified flows, with possible easy generalization to MHD flows, and perhaps to plasmas. KS for channel flows have also been validated. However, the absence of "sweeping effects" in present conventional KS versions is identified as a major drawback in very different applications: inertial particle clustering as well as in aeroacoustics. Nevertheless, this issue was addressed in some reference papers, and merits to be revisited in the light of new studies in progress.
Book Synopsis A Study of Lagrangian Statistics in Stationary Isotropic Turbulence Using Direct Numerical Simulations by : Pui-kuen Yeung
Download or read book A Study of Lagrangian Statistics in Stationary Isotropic Turbulence Using Direct Numerical Simulations written by Pui-kuen Yeung and published by . This book was released on 1989 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lecture series written by and published by . This book was released on 2000 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Building a Turbulent Jet written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanics of how particles diffuse, interact, eject, etc. within a fluid is applicable to numerous industrial and environmental applications. Unwanted products of combustion, dust contamination of solar panels, pathogen transport during a cough and ejections of particles during volcanic eruptions, are a few examples of flows in which increased knowledge of particle dynamics could result in substantial reduction of negative environmental and economic impacts. To better understand the tendencies of particles within shearing flows (such as jets), an extensive experimental campaign was conducted. Measurements of a turbulent round water jet were performed within an icosahedral tank. Particle tracking velocimetry was employed to create three-component, three-dimensional trajectories. Particles of varying size and weight were used to seed the flow in order to provide a range of inertial effects based on the particle interaction with the fluid. Numerous Eulerian and Lagrangian parameters were characterized and most notable, a trajectory stationarization technique was successfully implemented to address the inhomogeneity of the flow field. This approach could be extended to provide systematic methods to analyze complicated flow fields, enhancing knowledge of their dynamics. Alternatively, theoretical models of particle mechanics have been constructed, contributing to the baseline understanding of Lagrangian dynamics. Stochastic processes and phenomenological approaches are presented to accurately predict the low-order statistics of tracers, point particles which follow the motion of the fluid, for the idealized flow of homogeneous, isotropic and stationary turbulence (i.e. without the inclusions of external forces).
Book Synopsis Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows by : Abdallah Sofiane Berrouk
Download or read book Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows written by Abdallah Sofiane Berrouk and published by Bentham Science Publishers. This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the dispersion and the deposition of inertial particles convected by turbulent flows is a domain of research of considerable industrial interest. Inertial particle transport and dispersion are encountered in a wide range of flow configurations, whether they are of industrial or environmental character. Conventional models for turbulent dispersed flows do not appear capable of meeting the growing needs of chemical, mechanical and petroleum industries in this regard and physical environment testing is prohibitive. Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) ha.
Download or read book Gas-solid Flows, 1993 written by and published by . This book was released on 1993 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particle Dispersion in Homogeneous Turbulence Using the One-dimensional Turbulence Model by :
Download or read book Particle Dispersion in Homogeneous Turbulence Using the One-dimensional Turbulence Model written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lagrangian particle dispersion is studied using the one-dimensional turbulence (ODT) model in homogeneous decaying turbulence configurations. The ODT model has been widely and successfully applied to a number of reacting and nonreacting flow configurations, but only limited application has been made to multiphase flows. We present a version of the particle implementation and interaction with the stochastic and instantaneous ODT eddy events. The model is characterized by comparison to experimental data of particle dispersion for a range of intrinsic particle time scales and body forces. Particle dispersion, velocity, and integral time scale results are presented. Moreover, the particle implementation introduces a single model parameter [beta] p, and sensitivity to this parameter and behavior of the model are discussed. Good agreement is found with experimental data and the ODT model is able to capture the particle inertial and trajectory crossing effects. Our results serve as a validation case of the multiphase implementations of ODT for extensions to other flow configurations.
Book Synopsis The Interaction of Particles with Homogeneous Turbulence by : Kyle David Squires
Download or read book The Interaction of Particles with Homogeneous Turbulence written by Kyle David Squires and published by . This book was released on 1990 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lagrangian Stochastic Models for Turbulent Dispersion and Concentration Fluctuations in Homogeneous and Inhomogeneous Turbulence by : Luca Mortarini (t.d.-)
Download or read book Lagrangian Stochastic Models for Turbulent Dispersion and Concentration Fluctuations in Homogeneous and Inhomogeneous Turbulence written by Luca Mortarini (t.d.-) and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas-particle Flows by : David E. Stock
Download or read book Gas-particle Flows written by David E. Stock and published by . This book was released on 1995 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hybrid Particle Laden Flow Modelling by : David Schellander
Download or read book Hybrid Particle Laden Flow Modelling written by David Schellander and published by GRIN Verlag. This book was released on 2013-09-20 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2013 in the subject Engineering - Mechanical Engineering, grade: 1, University of Linz (Department on Particulate Flow Modelling), language: English, abstract: The numerical hybrid model EUgran+, which is an Eulerian-Eulerian granular phase model extended with models from the Eulerian-Lagrangian model for dense rapid particulate flows, is modified to account for poly-dispersed particle diameter distributions. These modifications include the implementation of I) a new poly-dispersed drag law and of II) new particle boundary conditions distinguishing between sliding and non-sliding particle-wall collisions and III) a new implementation of the population balance equation in the agglomeration model using the Eulerian-Lagrangian approach, referred to as Bus-stop model. Further, the applicability of the EUgran+ model is extended to cover dilute to dense poly-disperse particulate flows. Furthermore, this provides an improvement in the numerical simulation of dust separation and the formation of particle strands in industrial scale cyclones. In this PHD thesis, the EUgran+Poly model is validated at 3 specific cases with different mass loadings: I) poly-dispersed particle conveying in a square pipe with a 90 degree bend at low mass loading (L = 0:00206); II) a particle conveying case in a rectangular pipe with a double-loop at high mass loading (L = 1:5); III) in a vertical pipe the implementation of the agglomeration model is validated. To show the applicability of the presented models a simulation of an industrial cyclone in experimental scale is presented. The validation and application shows that considering a poly-disperse Eulerian-Eulerian granular phase improves the accordance of the simulation results with measurements significantly. Finally, the hybrid model is a good compromise for a computational efficient simulation of particulate transport and separation with different mass loading regimes.
Book Synopsis Collaborative Research: Lagrangian Modeling of Dispersion in the Planetary Boundary Layer by :
Download or read book Collaborative Research: Lagrangian Modeling of Dispersion in the Planetary Boundary Layer written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to improve scientists' understanding of dispersion in the planetary boundary layer, particularly the convective boundary layer (CBL), using Lagrangian "particle" models coupled with large-eddy simulation (LES) fields. A one-particle model for the mean concentration field was enhanced by a theoretically improved treatment of the LES subgrid-scale (SGS) velocities. The new model agreed with laboratory and field data and surface layer similarity theory. Investigations of stability effects on CBL dispersion showed that the dispersion rate decreased with a decreasing stability index -z(i)/L, which was attributed to the greater wind shear and the smaller turbulence scales in the surface layer. Using a two-particle model, the authors investigated relative dispersion in the CBL and found that it behaved in a quasi-homogeneous manner for all source heights except those near the surface; the latter was due to the vertical inhomogeneity in the dissipation rate. A study of concentration fluctuations revealed the large (factor of 10) variability caused by velocity field fluctuations; the predicted concentration variability matched the trends in field observations from CBL sources. (11 figures, 36 refs.).
Book Synopsis Dispersion of Particle Pairs in Homogeneous Turbulence by : Robert H. Kraichnan
Download or read book Dispersion of Particle Pairs in Homogeneous Turbulence written by Robert H. Kraichnan and published by . This book was released on 1966 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relative dispersion of particle pairs in homogeneous turbulence is treated by the Lagrangian-history direct-interaction closure approximation for a conserved scalar field. Richardson's diffusion equation emerges, with the sole difference that the eddy diffusivity depends on the duration of the dispersion as well as on particle separation. The diffusivity tensor is evaluated in the inertial range, and the probability distribution for the separation distance of a particle pair is computed for long-time, inertial-range dispersion. From this solution, numerical values are obtained for the dimensionless constants in Richardson's law for mean-square separation distance and Oboukhov's scalar-field inertial-range spectrum law. An inequality relating these two constants is inferred from qualitative considerations, without use of the closure approximation. (Author).
