Numerical Simulation Of Polydisperse Two Phase Turbulent Jets
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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 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.
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.
Modeling And Simulation Of Turbulent Mixing And Reaction
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Author : Daniel Livescu
language : en
Publisher: Springer Nature
Release Date : 2020-02-19
Modeling And Simulation Of Turbulent Mixing And Reaction written by Daniel Livescu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-19 with Technology & Engineering categories.
This book highlights recent research advances in the area of turbulent flows from both industry and academia for applications in the area of Aerospace and Mechanical engineering. Contributions include modeling, simulations and experiments meant for researchers, professionals and students in the area.
Numerical Simulation Of Particle Dispersion In Turbulent Jets
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Author : J. J. Lienau
language : en
Publisher:
Release Date : 1993
Numerical Simulation Of Particle Dispersion In Turbulent Jets written by J. J. Lienau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
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.
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.
Numerical Calculation Of Two Phase Turbulent Jets
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Author :
language : en
Publisher:
Release Date : 1995
Numerical Calculation Of Two Phase Turbulent Jets written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
A Similarity Solution Of A Second Order Model Of Free Turbulent Jets With A Passive Scalar Contaminant And Its Applicability To Two Phase Jets
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Author : Brian Ronald Cunningham
language : en
Publisher:
Release Date : 1980
A Similarity Solution Of A Second Order Model Of Free Turbulent Jets With A Passive Scalar Contaminant And Its Applicability To Two Phase Jets written by Brian Ronald Cunningham and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Fluid dynamics categories.
