Numerical Simulation Of Synthetic Jets

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Numerical Simulation Of Synthetic Jets

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Author : Alejandra Lorenzo Mora
language : en
Publisher:
Release Date : 2017

Numerical Simulation Of Synthetic Jets written by Alejandra Lorenzo Mora and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

Synthetic jet actuators (SJA) or zero-net mass flux (ZNMF) actuators are devices consisting of a cavity with a small orifice or slot, inside of which is a moving oscillator. Thecavity is connected to the external medium by means of a neck. The oscillator drivercan be a diaphragm, whose periodic movement makes the fluid leave and enter the cav-ity. When the flow exits from the neck a train of vortices is formed, to be able to obtainthe jet, these vortices cannot be swallowed back into the cavity when the membrane is moving down. To ensure that this is not happening the parameter jet formation criteria(JFC) is defined. The JFC only depends on geometrical parameters as the longitudeand the amplitude of the membrane, when the movement of the membrane is periodic.When the jet is successfully formed, it is able to transfer kinetic energy and momentumto the fluid without a mass addition. Several potential applications of this technologyexist, e.g, active flow control (AFC), cooling and fuel mixing.The present work solves a SJA impinged into a hot wall. The case at low Reynolds(Re= 50) is considered to be laminar and incompressible. Four different neck longitudes are compared to see which is the importance of the neck length. The strategy to solve these cases is running three meshes with different densities. The simulationwith the less dense mesh can run more cycles spending less computational time, theresults of this mesh are the inputs of the denser mesh. The case is configured usingmoving mesh techniques for the actuator membrane. In this situation, the decouplingof velocity and frequency is no longer possible and other strategies need to be applied.Velocity and temperature are found to reach a steady state after about 50 actuatorcycles, however, the Nusselt number features a low frequency that makes the whole case longer to converge. It is estimated that a number of around 200 actuator cyclesare needed for the Nusselt number to reach the steady state. This fact complicates theflow, despite the fact that the Reynolds number is low. The effect of changing the necklength has a direct effect on the velocity but has little influence on the temperature orthe Nusselt number.

Handbook Of Numerical Simulation Of In Flight Icing

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Author : Wagdi George Habashi
language : en
Publisher: Springer Nature
Release Date : 2023-12-11

Handbook Of Numerical Simulation Of In Flight Icing written by Wagdi George Habashi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-12-11 with Technology & Engineering categories.

This Handbook of Numerical Simulation of In-Flight Icing covers an array of methodologies and technologies on numerical simulation of in-flight icing and its applications. Comprised of contributions from internationally recognized experts from the Americas, Asia, and the EU, this authoritative, self-contained reference includes best practices and specification data spanning the gamut of simulation tools available internationally that can be used to speed up the certification of aircraft and make them safer to fly into known icing. The collection features nine sections concentrating on aircraft, rotorcraft, jet engines, UAVs; ice protection systems, including hot-air, electrothermal, and others; sensors and probes, CFD in the aid of testing, flight simulators, and certification process acceleration methods. Incorporating perspectives from academia, commercial, government R&D, the book is ideal for a range of engineers and scientists concerned with in-flight icing applications.

Synthetic Jets

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Author : Kamran Mohseni
language : en
Publisher: CRC Press
Release Date : 2014-09-17

Synthetic Jets written by Kamran Mohseni and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-17 with Science categories.

Compiles Information from a Multitude of SourcesSynthetic jets have been used in numerous applications, and are part of an emergent field. Accumulating information from hundreds of journal articles and conference papers, Synthetic Jets: Fundamentals and Applications brings together in one book the fundamentals and applications of fluidic actuators.

Unsteady Numerical Simulations Of Subsonic Flow Over A Projectile With Jet Interaction

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Author : Jabaraj Sahu
language : en
Publisher:
Release Date : 2003

Unsteady Numerical Simulations Of Subsonic Flow Over A Projectile With Jet Interaction written by Jabaraj Sahu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Aerodynamics categories.

This report describes a computational study undertaken to consider the aerodynamic effect of synthetic jets as a means to provide the control authority needed to maneuver a projectile at low subsonic speeds. The time-accurate Navier-Stokes computational technique has been used to obtain numerical solutions for the unsteady jet interaction flow field for a projectile at a subsonic speed, Mach = 0.11, and several angles of attack from O deg to 4 deg. Qualitative flow field features show the interaction of the time dependent jet with the free stream flow. Numerical results show the effect of the jet on the flow field, surface pressures and aerodynamic coefficients. Unsteady numerical results have been obtained for a two-dimensional jet flow and compared with experimental data for validation. The same unsteady jet modeling technique has been applied to a subsonic projectile. These numerical results are being assessed to determine if synthetic jets can be used to provide the control authority needed for maneuvering munitions to hit the targets with precision.

Numerical Simulation Of Synthetic Jet Actuators

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Author : Linda D. Kral
language : en
Publisher:
Release Date : 1997

Numerical Simulation Of Synthetic Jet Actuators written by Linda D. Kral 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.

Investigation Of Synthetic Jets Heat Transfer And Flow Field

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Author : Carlo Salvatore Greco
language : en
Publisher: Youcanprint
Release Date : 2015-04-30

Investigation Of Synthetic Jets Heat Transfer And Flow Field written by Carlo Salvatore Greco and has been published by Youcanprint this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-30 with Technology & Engineering categories.

Synthetic jets are devices able to “synthetize” a jet from the ambient in which they are embedded through a simple membrane oscillation inside a cavity with an orifice. Such features make them high reliable, silent and easy to be miniaturized. For these reasons, they are widely investigated as electronic cooling devices. The present research is focused on the design and analysis of a different type of synthetic jet device compared to its single classical configuration. Such a device his experimentally characterized through the study of its free and impinging flow field and the evaluation of its heat transfer performance.

Iutam Symposium On Flow Control And Mems

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Author : Jonathan F. Morrison
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-09-09

Iutam Symposium On Flow Control And Mems written by Jonathan F. Morrison 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 2010-09-09 with Technology & Engineering categories.

The Symposium brought together many of the world’s experts in fluid mechanics, microfabrication and control theory to discover the synergy that can lead to real advances and perhaps find ways in which collaborative projects may proceed. The high profile meeting was attended by keynote speakers who are leaders in their fields. A key driver was the improvement in flow efficiency to reduce drag, and thereby emissions arising from transport. About 65 papers were presented.

Vortex Rings And Jets

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Author : Daniel T. H. New
language : en
Publisher: Springer
Release Date : 2015-03-26

Vortex Rings And Jets written by Daniel T. H. New and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-26 with Technology & Engineering categories.

In this book, recent developments in our understanding of fundamental vortex ring and jet dynamics will be discussed, with a view to shed light upon their near-field behaviour which underpins much of their far-field characteristics. The chapters provide up-to-date research findings by their respective experts and seek to link near-field flow physics of vortex ring and jet flows with end-applications in mind. Over the past decade, our knowledge on vortex ring and jet flows has grown by leaps and bounds, thanks to increasing use of high-fidelity, high-accuracy experimental techniques and numerical simulations. As such, we now have a much better appreciation and understanding on the initiation and near-field developments of vortex ring and jet flows under many varied initial and boundary conditions. Chapter 1 outlines the vortex ring pinch-off phenomenon and how it relates to the initial stages of jet formations and subsequent jet behaviour, while Chapter 2 takes a closer look at the behaviour resulting from vortex ring impingement upon solid boundaries and how the use of a porous surface alters the impingement process. Chapters 3 and 4 focus upon the formation of synthetic jets from vortex ring structures experimentally and numerically, the challenges in understanding the relationships between their generation parameters and how they can be utilized in flow separation control problems. Chapter 5 looks at the use of imposing selected nozzle trailing-edge modifications to effect changes upon the near-field dynamics associated with circular, noncircular and coaxial jets, with a view to control their mixing behaviour. And last but not least, Chapter 6 details the use of unique impinging jet configurations and how they may lend themselves towards greater understanding and operating efficacies in heat transfer problems. This book will be useful to postgraduate students and researchers alike who wish to get up to speed regarding the latest developments in vortex ring and jet flow behaviour and how their interesting flow dynamics may be put into good use in their intended applications.

Proceedings Of Xxiv Aimeta Conference 2019

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Author : Antonio Carcaterra
language : en
Publisher: Springer Nature
Release Date : 2020-03-31

Proceedings Of Xxiv Aimeta Conference 2019 written by Antonio Carcaterra and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-31 with Science categories.

This book gathers the peer-reviewed papers presented at the XXIV Conference of the Italian Association of Theoretical and Applied Mechanics, held in Rome, Italy, on September 15-19, 2019 (AIMETA 2019). The conference topics encompass all aspects of general, fluid, solid and structural mechanics, as well as mechanics for machines and mechanical systems, including theoretical, computational and experimental techniques and technological applications. As such the book represents an invaluable, up-to-the-minute tool, providing an essential overview of the most recent advances in the field.

Numerical Simulation Of Separation Control Via Synthetic Jets

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Author : D. E. Parekh
language : en
Publisher:
Release Date : 2002

Numerical Simulation Of Separation Control Via Synthetic Jets written by D. E. Parekh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.