A Combined Eulerian-Volume of Fraction-Lagrangian Method for Atomization Simulation PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722127954
Category :
Languages : en
Pages : 56
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Book Description
The tracking of free surfaces between liquid and gas phases and analysis of the interfacial phenomena between the two during the atomization and breakup process of a liquid fuel jet is modeled. Numerical modeling of liquid-jet atomization requires the resolution of different conservation equations. Detailed formulation and validation are presented for the confined dam broken problem, the water surface problem, the single droplet problem, a jet breakup problem, and the liquid column instability problem. Seung, S. P. and Chen, C. P. and Ziebarth, John P. Unspecified Center...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722127954
Category :
Languages : en
Pages : 56
Get Book Here
Book Description
The tracking of free surfaces between liquid and gas phases and analysis of the interfacial phenomena between the two during the atomization and breakup process of a liquid fuel jet is modeled. Numerical modeling of liquid-jet atomization requires the resolution of different conservation equations. Detailed formulation and validation are presented for the confined dam broken problem, the water surface problem, the single droplet problem, a jet breakup problem, and the liquid column instability problem. Seung, S. P. and Chen, C. P. and Ziebarth, John P. Unspecified Center...
Author:
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Category :
Languages : en
Pages :
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Author:
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Category : Aeronautics
Languages : en
Pages : 548
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Author: Wei Ning
Publisher:
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Category :
Languages : en
Pages : 212
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Category : Aeronautics
Languages : en
Pages : 990
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Author: Chia-Wei Kuo (Ph.D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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A numerical tool to study the physics of sprays is Direct Numerical Simulation (DNS) via Volume- of-Fluid (VoF) methods. A noteworthy limitation of this method is its high computational power demand. In the cases of industrial sprays, the total number of computational cells required can be up to a trillion. Consequently, alternative strategies for alleviating the excessive computational burden of a DNS while still preserving a comparable level of solution fidelity are required.One strategy is the Adaptive Mesh Refinement (AMR) method. The AMR serves to dynamically allocate high-resolution grids in the regions requiring them. Due to such a feature, the AMR is expected to provide a speedup benefit against a traditional static mesh. A detailed analysis of the AMR speedup promise for spray problems is performed. Results show that the envisioned advantage does not hold for high-velocity sprays, and two factors cause it. The first and obvious one is the number of AMR grids, which grows as the calculation proceeds. The second and less apparent factor is the decay of the cell-base speedup, which is related to the Frobenius condition number. The other engineering approach is to combine VoF and Lagrangian-Eulerian (LE) strategies (VoFLE). In this method, the liquid bodies that local grids can characterize are numerically captured by VoF. The liquid elements that fall below the local mesh resolutions, i.e., unresolved structures, are transitioned into discrete Lagrangian droplets and handled in a LE fashion. We present a new VoFLE method by including the capabilities of computing potential further breakup of unresolved structures. The calculation of breakup is based on Maximum Entropy Formalism (MEF) conditional on the satisfaction of mass, momentum, and energy conservation constraints. Reasonable agreements are shown in the comparison between the predicted mean Sauter mean diameter and the experimental measurements. Last, further expansion of the VoFLE solver for handling compressibility effect, heat transfer, and Lagrangian droplet vaporization is briefly addressed. This work is ongoing, and more detailed analyses and improvements are planned.
Author: Stéphane Vincent
Publisher: Springer Nature
ISBN: 3031092651
Category : Technology & Engineering
Languages : en
Pages : 314
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Book Description
The book provides basic and recent research insights concerning the small scale modeling and simulation of turbulent multi-phase flows. By small scale, it has to be understood that the grid size for the simulation is smaller than most of the physical time and space scales of the problem. Small scale modeling of multi-phase flows is a very popular topic since the capabilities of massively parallel computers allows to go deeper into the comprehension and characterization of realistic flow configurations and at the same time, many environmental and industrial applications are concerned such as nuclear industry, material processing, chemical reactors, engine design, ocean dynamics, pollution and erosion in rivers or on beaches. The work proposes a complete and exhaustive presentation of models and numerical methods devoted to small scale simulation of incompressible turbulent multi-phase flows from specialists of the research community. Attention has also been paid to promote illustrations and applications, multi-phase flows and collaborations with industry. The idea is also to bring together developers and users of different numerical approaches and codes to share their experience in the development and validation of the algorithms and discuss the difficulties and limitations of the different methods and their pros and cons. The focus will be mainly on fixed-grid methods, however adaptive grids will be also partly broached, with the aim to compare and validate the different approaches and models.
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Category : Science
Languages : en
Pages : 776
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Author: Shankar Subramaniam
Publisher: Academic Press
ISBN: 0323901344
Category : Science
Languages : en
Pages : 588
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Modelling Approaches and Computational Methods for Particle-laden Turbulent Flows introduces the principal phenomena observed in applications where turbulence in particle-laden flow is encountered while also analyzing the main methods for analyzing numerically. The book takes a practical approach, providing advice on how to select and apply the correct model or tool by drawing on the latest research. Sections provide scales of particle-laden turbulence and the principal analytical frameworks and computational approaches used to simulate particles in turbulent flow. Each chapter opens with a section on fundamental concepts and theory before describing the applications of the modelling approach or numerical method. Featuring explanations of key concepts, definitions, and fundamental physics and equations, as well as recent research advances and detailed simulation methods, this book is the ideal starting point for students new to this subject, as well as an essential reference for experienced researchers. Provides a comprehensive introduction to the phenomena of particle laden turbulent flow Explains a wide range of numerical methods, including Eulerian-Eulerian, Eulerian-Lagrange, and volume-filtered computation Describes a wide range of innovative applications of these models
Author: Martyn Alderman
Publisher: Springer
ISBN: 3319482319
Category : Technology & Engineering
Languages : en
Pages : 502
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Book Description
The Magnesium Technology Symposium, the event on which this collection is based, is one of the largest yearly gatherings of magnesium specialists in the world. Papers in this collection represent all aspects of the field, ranging from primary production to applications to recycling. Moreover, papers explore everything from basic research findings to industrialization. This volume covers a broad spectrum of current topics, including alloys and their properties; cast products and processing; wrought products and processing; forming, joining, and machining; corrosion and surface finishing; ecology; and structural applications. In addition, there is coverage of new and emerging applications in such areas as hydrogen storage.
