Numerical Simulations Of Multiphase Turbulent Jets
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Numerical Simulations Of Multiphase Turbulent Jets
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Author : Thomas Gabriel Almeida
language : en
Publisher:
Release Date : 2004
Numerical Simulations Of Multiphase Turbulent Jets written by Thomas Gabriel Almeida and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Fluid dynamics categories.
Experiments And Numerical Simulations Of Diluted Spray Turbulent Combustion
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Author : Bart Merci
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-06-20
Experiments And Numerical Simulations Of Diluted Spray Turbulent Combustion written by Bart Merci and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-20 with Technology & Engineering categories.
This book reflects the outcome of the 1st International Workshop on Turbulent Spray Combustion held in 2009 in Corsica (France). The focus is on reporting the progress of experimental and numerical techniques in two-phase flows, with emphasis on spray combustion. The motivation for studies in this area is that knowledge of the dominant phenomena and their interactions in such flow systems is essential for the development of predictive models and their use in combustor and gas turbine design. This necessitates the development of accurate experimental methods and numerical modelling techniques. The workshop aimed at providing an opportunity for experts and young researchers to present the state-of-the-art, discuss new developments or techniques and exchange ideas in the areas of experimentations, modelling and simulation of reactive multiphase flows. The first two papers reflect the contents of the invited lectures, given by experts in the field of turbulent spray combustion. The first concerns computational issues, while the second deals with experiments. These lectures initiated very interesting and interactive discussions among the researchers, further pursued in contributed poster presentations. Contributions 3 and 4 focus on some aspects of the impact of the interaction between fuel evaporation and combustion on spray combustion in the context of gas turbines, while the final article deals with the interaction between evaporation and turbulence.
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section
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Author : Robert V. Wilson
language : en
Publisher:
Release Date : 1997
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section written by Robert V. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Navier-Stokes equations categories.
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section
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Author : Robert V. Wilson
language : en
Publisher:
Release Date : 1997
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section written by Robert V. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Three-dimensional turbulent jets with rectangular cross-section are simulated with a finite-difference numerical method. The full Navier-Stokes equations are solved at low Reynolds numbers, whereas at the high Reynolds numbers filtered forms of the equations are solved along with a subgrid scale model to approximate effects of the unresolved scales. A 2-N storage, third-order Runge-Kutta scheme is used for temporal discretization and a fourth-order compact scheme is used for spatial discretization. Computations are performed for different inlet conditions which represent different types of jet forcing. The phenomenon of axis-switching is observed, and it is confirmed that this is based on self-induction of the vorticity field. Budgets of the mean streamwise velocity show that convection is balanced by gradients of the Reynolds stresses and the pressure.
Mathematical Modelling And Numerical Simulations Of Chemically Reacting Turbulent Jets
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Author : Kian Mehravaran
language : en
Publisher:
Release Date : 2005
Mathematical Modelling And Numerical Simulations Of Chemically Reacting Turbulent Jets written by Kian Mehravaran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Chemical reactions categories.
Theory And Modeling Of Dispersed Multiphase Turbulent Reacting Flows
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Author : Lixing Zhou
language : en
Publisher: Butterworth-Heinemann
Release Date : 2018-01-25
Theory And Modeling Of Dispersed Multiphase Turbulent Reacting Flows written by Lixing Zhou and has been published by Butterworth-Heinemann this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-25 with Science categories.
Theory and Modeling of Dispersed Multiphase Turbulent Reacting Flows gives a systematic account of the fundamentals of multiphase flows, turbulent flows and combustion theory. It presents the latest advances of models and theories in the field of dispersed multiphase turbulent reacting flow, covering basic equations of multiphase turbulent reacting flows, modeling of turbulent flows, modeling of multiphase turbulent flows, modeling of turbulent combusting flows, and numerical methods for simulation of multiphase turbulent reacting flows, etc. The book is ideal for graduated students, researchers and engineers in many disciplines in power and mechanical engineering. Provides a combination of multiphase fluid dynamics, turbulence theory and combustion theory Covers physical phenomena, numerical modeling theory and methods, and their applications Presents applications in a wide range of engineering facilities, such as utility and industrial furnaces, gas-turbine and rocket engines, internal combustion engines, chemical reactors, and cyclone separators, etc.
A Numerical And Experimental Study Of Turbulent Single And Multiphase Forced Plumes And Jets At Moderate Reynolds Numbers
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Author : Gordon N. Taub
language : en
Publisher:
Release Date : 2013
A Numerical And Experimental Study Of Turbulent Single And Multiphase Forced Plumes And Jets At Moderate Reynolds Numbers written by Gordon N. Taub and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Flows where a narrow body of fluid, carried by initial momentum or buoyancy, entrains an ambient fluid are common in the environment. Volcanoes, smoke exiting a chimney or rising from a forest fire, tornadoes and deep water oil spills are just a few examples. If the main driving force is momentum we term such a flow a jet. On the other hand, if the main driving force is buoyancy we typically refer to the flow as a plume. Perhaps more common, initial momentum and buoyancy are both present in which case we can refer to the flow as either a buoyant jet or a forced plume. Forced plumes can be either single phase, where buoyancy is caused by either a difference in temperature or some other scalar phenomenon, or multiphase where buoyancy is due to the injection of particles, bubbles or drops of material other than the ambient fluid into the flow. In this study single and multiphase jets and plumes will be examined. A laminar study will be presented which examines the effect of the addition of a small amount of nonzero angular momentum to jets and plumes. The results of direct numerical simulations of a pure jet, a pure plume and a forced plume, in the turbulent, moderate Reynolds number regime are presented and compared. Each simulation was run long enough so that time averaged third order statistics converged, allowing each term of the turbulent kinetic energy equation and Reynolds stress transport equations to be calculated directly. The results of laboratory experiments of a pure jet and multiphase plume, conducted at Ecole Nationale Superieure De Mecanique et D'Aerotechnique (ENSMA) located in Poitiers, France will be presented. Preliminary results of multiphase plume simulations using the Equilibrium-Eulerian technique will be discussed.
Direct Numerical Simulations Of Gas Liquid Multiphase Flows
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Author : Grétar Tryggvason
language : en
Publisher: Cambridge University Press
Release Date : 2011-03-10
Direct Numerical Simulations Of Gas Liquid Multiphase Flows written by Grétar Tryggvason and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-10 with Computers categories.
Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.
Numerical Simulation Of Polydisperse Two Phase Turbulent Jets
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Author : Jorge M. M. Barata
language : en
Publisher:
Release Date : 1999
Numerical Simulation Of Polydisperse Two Phase Turbulent Jets written by Jorge M. M. Barata and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Numerical Simulation And Spectral Modal Analysis Of Nonlinear Dynamics And Acoustics In Turbulent Jets
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Author : Akhil Nekkanti
language : en
Publisher:
Release Date : 2023
Numerical Simulation And Spectral Modal Analysis Of Nonlinear Dynamics And Acoustics In Turbulent Jets written by Akhil Nekkanti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Turbulent jets are canonical flows that occur when fluid emerges from an orifice into the surrounding environment, such as the jet from aircraft engines. As the fluid emerges from the nozzle, it forms an unstable shear layer that grows very rapidly, forming large-scale coherent structures, which are the main sources of aft-angle jet noise. The mechanism behind the generation of jet noise is still not fully understood. Further insights into characteristics of coherent structures can aid our understanding of turbulence, and in modeling and controlling various mechanisms. The development of techniques for the education of coherent structures is another objective of this work.The main foci of this work are: (i) performing high-fidelity numerical simulations of turbulent jets and extracting physical insights from coherent flow structures, and (ii) developing techniques that extract these flow structures from the large dataset generated by these simulations. In recent years, spectral proper orthogonal decomposition (SPOD) has emerged as a major tool for extracting coherent structures. In the first part, we extend SPOD for low-rank reconstruction, denoising, prewhitenening, frequency-time analysis, and gappy-data reconstruction. Two approaches for flow-field reconstruction are proposed, a frequency-domain approach, and a time-domain approach. A SPOD-based denoising strategy is also presented, which achieves significant noise reduction while facilitating drastic data compression. A convolution-based strategy is proposed for frequency-time analysis that characterizes the intermittency of spatially coherent flow structures. When applied to the turbulent jet data, SPOD-based frequency-time analysis reveals that the intermittent occurrence of large-scale coherent structures is directly associated with high-energy events. Lastly, a new algorithm, gappy-SPOD, is developed that leverages the space-time correlation of SPOD modes to estimate missing data. Even for highly chaotic flows with up to 20% missing data, our method facilitates that structures associated with different time scales are well-estimated in the missing regions. For the cases considered here, it outperforms established techniques such as gappy-POD and Kriging. In the second part, we investigate the nonlinear dynamics and controllability of coherent structures by actuating them. Large-eddy simulations (LES) of two unforced and four forced jets at Re = 50,000 and M_j = 0.4 were performed. The two unforced jets include an initially laminar and a turbulent jet. All four forced jets are turbulent and are forced at the azimuthal wavenumbers m=0, m=±1, m=±2, and m=±6. The unforced and forced jets were validated with companion experiments. Compared to the turbulent jet, the initially laminar jet develops later but at a faster rate, which is a result of the vortex pairing in the shear layer. The emphasis of the analysis is on characterizing the vortex pairing and the associated nonlinear energy transfer. Here, for the first time, we evaluate the spectral energy budget based on the leading modes of the SPOD. Our analysis reveals that energy flows from the fundamental to its subharmonic, resulting in the growth of the subharmonic. These results provide evidence for a previously suggested parametric resonance mechanism. In the forced jets, we examine the effect of forcing using a recently proposed method, bispectral mode decomposition (BMD), which extracts flow structures associated with nonlinear triadic interactions. We use BMD to construct a cascade of triads and find that the most dominant triads arise due to fundamental self-interaction and second-harmonic-fundamental difference interaction. Furthermore, our analysis of the far-field in the unforced and m=0-forced jets sheds light on the crucial role of difference-interactions in the generation of jet noise.
