Atomization simulations using an Eulerian-VOF-Lagrangian method



Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in [Washington, DC, Springfield, Va

Written in English
Published: Downloads: 644
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Subjects:

  • Volume.,
  • Computational fluid dynamics.,
  • Mathematical models.,
  • Lagrangian function.,
  • Euler-Lagrange equation.

Edition Notes

Other titlesAtomization simulations using an Eulerian VOF Lagrangian method.
StatementYen-Sen Chen ... [et al.].
Series[NASA contractor report] -- NASA-CR-201983., NASA contractor report -- NASA CR-201983.
ContributionsChen, Yen-Sen., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15498997M

Atomization may also refer to: Science and technology. The making of an aerosol, which is a colloidal suspension of fine solid particles or liquid droplets in a gas; An apparatus using an atomizer nozzle; Sprays, mists, fogs, clouds, dust clouds and smoke, which appear to be atomized; A nebulizer, which is a device used to administer medication in the form of a mist inhaled into the lungs. industrial and scientific interest. Using modern computers, researchers can now study the dynamics in great detail, and computer simulations are yielding unprece-dented insight. This book provides a comprehensive introduction to direct numer-ical simulations of multiphase flows for researchers and graduate students. The paper presents test results of the method for numerical simulation of liquid fuel spraying based on the Eulerian-Lagrangian model. This model describes the fluid flow inside the injector and directly behind it using the Euler-VOF method, while the dispersed medium (droplets) formed at a certain distance from the injector is described using the Lagrange approach. T1 - Detailed numerical simulations of the primary atomization of a turbulent liquid jet in crossflow. AU - Herrmann, Marcus. PY - /12/1. Y1 - /12/1. N2 - This paper presents numerical simulation results of the primary atomization of a turbulent liquid jet injected into a gaseous by: 1.

The shadowgraphy method has the advantage of using a similar post-processing method as the numerical analysis, by determining the contour of droplets according to respectively grey level and volume fraction values. Shadowgraphy also allowed the visualization and recording of the macroscopic phenomenology of the liquid in the transient by: 4.   This paper presents numerical simulation results of the primary atomization of a turbulent liquid jet injected into a gaseous crossflow. Simulations are performed using the balanced force refined level set grid method. The phase interface during the initial breakup phase is tracked by a level set method on a separate refined by: Recent advances in numerical methods coupled with the substantial enhancements in computing power and the advent of high performance computing have presented first principle, high fidelity simulation as a viable tool in the prediction and analysis of spray atomization by: 6. Boolean Operations. Boolean operators are powerful tools that you will need to use at some stage in design modeller, to be able to select differnt solids to subtract or add is through using the suppres solid option, you can find the body operation option undr the create heading.

ISBN: OCLC Number: Description: xv, pages ; 29 cm. Contents: 1. General considerations Basic processes in atomization Drop size distributions of sprays Atomizers Flow in atomizers Atomizer performance External spray characteristics Drop evaporation Spray size and patternation methods. This book concentrates on modeling and numerical simulations of combustion in liquid rocket engines, covering liquid propellant atomization, evaporation of liquid droplets, turbulent flows, turbulent combustion, heat transfer, and combustion instability. It presents some state of the art models and numerical methodologies in this area. The book can be categorized into two parts.

Atomization simulations using an Eulerian-VOF-Lagrangian method Download PDF EPUB FB2

Computational fluid dynamics (CFD) numerical method using the volume-of-fluid (VOF) model and a Lagrangian tracking model which can be employed to analyze general multiphase flow problems with free surface mechanism.

This paper summarizes the technical development and validation of a multiphase computational fluid dynamics (CFD) numerical method using the volume-of-fluid (VOF) model and a Lagrangian tracking model which can be employed to analyze general multiphase flow problems with free surface : Yen-Sen Chen, Huan-Min Shang, Paul Liaw, C.

Chen. This paper summarizes the technical development and validation of a multiphase computational fluid dynamics (CFD) numerical method using the volume-of-fluid (VOF) model and a Lagrangian. Initial testing of the methodology indicate that the combined Eulerian-VOF-Lagrangian strategy is robust for both transient and steady state cases, and is ready for including other physical.

The atomization-evaporation process of liquid fuel jet spray in the vicinity of a nozzle in crossflows is investigated by a detailed numerical simulation using an Eulerian/Lagrangian framework. The Eulerian framework is applied for each gas or liquid continuum fluid phase, whereas the Lagrangian framework is applied for the dispersed droplets generated by the atomization process.

The Eulerian-Lagrangian Spray Atomization (ELSA) model is considered for the predic-tion of turbulent spray atomization processes associated with liquid fuels. In this approach, the dense spray region is modelled using an Eulerian-based quasi-multiphase model while the disperse spray region is modelled using a Lagrangian droplet model.

Unlike otherFile Size: 5MB. Details of atomization simulations using Eul-Lag methods can be obtained from Atomization simulations using an Eulerian-VOF-Lagrangian method (SuDoc NAS ) or A coupled Eulerian/Lagrangian method for the solution of.

Efficiently Modeling Primary Liquid Atomization using an Eulerian-Lagrangian Hybrid Model in ANSYS Fluent. Outline Dynamic Adaption Methods •Available for all mesh topologies except Polyhedra Hanging Node DPM data collection for faster DPM only simulation.

The Handbook of Atomization and Sprays Atomization simulations using an Eulerian-VOF-Lagrangian method book the fundamentals, as well as applied material from all fields into one thorough, comprehensive resource. Subject areas included in the reference are droplets, theoretical models and numerical simulations, phase Doppler particle analysis, applications, devices and more.

"The book covers important topics with tremendous applications in industrial and medical applications.

This second edition keep the best sections of the first edition while all other sections and chapters are completely rewritten or updated. All developments in simulation and measurement techniques of atomization and spraying are included. Get this from a library.

Atomization simulations using an Eulerian-VOF-Lagrangian method. [Yen-Sen Chen; United States. National Aeronautics and Space Administration.;]. is used to denote a family of modeling and simulation techniques wherein droplets or particles are represented in a Lagrangian reference frame while the carrier–phase flow field is represented in an Eulerian frame.

This paper primarily focuses on the use of the LE approach as a solution method for. Khuong., AD. The Eulerian-Lagrangian Spray Atomization (ELSA) Model of the Jet Atomization in CFD Simulations: Evaluation and Validation [Tesis doctoral no publicada].

Some atomization methods are described below. Flame method Atomizes with flame. Electric heating furnace method Atomizes with current.

Hydride generation method Application of the frame method (uses a chemical reaction to vaporize the specific element) Reduction-vaporization method Atomizes using an element's easy-to-evaporate. Atomization Methods.

Atomization involves the formation of powder from molten metal using a spray of either a gas or liquid. This is the most significant method of producing metal powder particles.

In gas atomization, generally inert gases like nitrogen, helium, or argon are used for breaking up the stream of molten metal.

This atomization method achieves the highest degree of atomization: the finest droplets. Under certain conditions, the droplets can completely evaporate. Pneumatic nozzles can be used, for example, to atomize more viscous media than water. A distinction is made between internal and external mixing pneumatic nozzles.

Summary This chapter describes the atomization mechanism of liquid propellant, Book Author(s): the chapter discusses the progress made in numerical simulations of atomization using interface tracking methods in recent years. Internal Combustion Processes of Liquid Rocket Engines: Modeling and Numerical Simulations.

book is melt atomization and powder generation. Melt atomization, which is the dominant method used commercially to produce metal and alloy powders, is considered in Chap. Mechanisms of melt breakup and atomization, powder morphology,droplet dynamics,and soonare considered.

In. Numerical Simulations of Multiphase Flows - Atomization ó 1. INTRODUTION Motivation of study Nowadays, numerical simulations are becoming more and more relevant in the scientific and technological world.

They prevent wrong designs, give ideas of better solutions and lead a greater understanding of new technology operations. The cause of under-prediction can be attributed to the use of WAVE sub-models for crossflow atomization. The comparisons of other quantities predicted by both simulations also suggest that there is still a large space for improving the Lagrangian spray models, especially when to be applied for realistic engine conditions.

A combined Eulerian-volume of fraction-Lagrangian method for atomization simulation: Authors: Seung, S. P.; Chen, C. P Confinement, Drops (Liquids), Liquid Fuels, Mathematical Models, Multiphase Flow, Simulation: Bibliographic Code: Numerical modeling of liquid-jet atomization requires the resolution of different conservation equations.

This book concentrates on modeling and numerical simulations of combustion in liquid rocket engines, covering liquid propellant atomization, evaporation of liquid droplets, turbulent flows, turbulent combustion, heat transfer, and combustion instability.

It presents some state of the art models and numerical methodologies in this area. Because of the large dimension difference between the Taylor cone and the liquid jet, the simulations involve two drastically different length scales for describing the dynamic of the entire process.

To accurately include the effect of the ring electrode, the electrical field distribution is first calculated over a domain large enough to Cited by: Details of atomization simulations using Eul-Lag methods can be obtained from Atomization simulations using an Eulerian-VOF-Lagrangian method (SuDoc NAS ) or A coupled Eulerian/Lagrangian method for the solution of three-dimensional vortical.

A next-generation spray and atomization model for high-pressure diesel sprays has been developed and imple-mented into an engine computational fluid dynamics (CFD) code (KIVA-3V), together with a nozzle flow cavitation model and an evaporation model for the Eulerian liquid phase.

In contrast to the widely used Lagrangian atomiza. In this study, a 3D model for atomization based on an Eulerian single-phase approach has been implemented in a professional CFD code for simulations in engines: AVL Fire The method improves the description of the primary break-up by representing the strong interactions between the liquid and the gas phase that take place in the atomization by: Direct numerical simulations of multiphase flows, using a front-tracking method, are presented.

The method is based on writing one set of governing equations for the whole computational domain and treating the different phases as one fluid with variable material properties.

Interfacial terms are accounted for by adding the ap-File Size: KB. In this paper, a modified level set method is proposed for simulation of multiphase flows with large density ratio and high Reynolds number.

The present method simply introduces a source or sink term into the level set equation to compensate the mass loss or offset the mass by: 6. Author(s) F. Ham, Y.-N. young, S. Apte & M. Herrmann. Abstract. A hybrid Eulerian-Lagrangian method for LES of atomising spray F. am', Y.-N.

young2, S. ~ ~ t e ' & M. ~errmann~ I Center for Integrated Turbulence Simulations, Stanford University, USA 'center for Turbulence Research, Stanford University, USA Abstract Our goal in the this work is to develop a hybrid Eulerian-Lagrangian technique Author: F.

Ham, Y.-N. young, S. Apte, M. Herrmann. Journal Article: Combined Eulerian-VOF-Lagrangian method for general gas-liquid flow applications. Euler and Lagrange descriptions Euler approach The fluid properties p,ρ,v are It is generally more common to use Eulerian approach to fluid flows.

Measuring water temperature, or pressure at a point in a pipe. In the Eulerian method, the fundamental property is File Size: KB.

A new simulation method is developed based on large-eddy simulation coupled with the volume-of-fluid method. The simulation system is verified by comparing its output with photographs taken in the first step of the study. Simulations are then conducted using an approximation of a real cavity to visualize how it is filled by the atomized molten Author: Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai.In this paper the atomization character of the pressure-swirl injector was measured by using the Phase Doppler Particle Analyzer (PDPA) in the section of mm below the outlet of the orifice.

The orifice diameter of the pressure-swirl injector is mm. The atomization character includes the spray angle, the water flow rate, the Sauter mean diameter (SMD), the velocity of the particles and Cited by: 4.