Download or read book CFD Modelling of Flow Distortion Using OpenFOAM written by Sylvie Fabre and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a computational fluid dynamic (CFD) study of flow related to wind engineering. The open source CFD code OpenFOAM was applied to three cases (i) flow over an oil platform, (ii) flow over a complex terrain and (iii) flow over a met mast. In order to verify the results, experimental work was undertaken using a low speed wind tunnel. In general, the CFD results showed an excellent concurrence with the wind tunnel data. This confirming that correctly used, open source CFD may be applied to wind engineering flows with confidence.

Download or read book The Finite Volume Method in Computational Fluid Dynamics written by F. Moukalled and published by Springer. This book was released on 2015-08-13 with total page 799 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook explores both the theoretical foundation of the Finite Volume Method (FVM) and its applications in Computational Fluid Dynamics (CFD). Readers will discover a thorough explanation of the FVM numerics and algorithms used for the simulation of incompressible and compressible fluid flows, along with a detailed examination of the components needed for the development of a collocated unstructured pressure-based CFD solver. Two particular CFD codes are explored. The first is uFVM, a three-dimensional unstructured pressure-based finite volume academic CFD code, implemented within Matlab. The second is OpenFOAM®, an open source framework used in the development of a range of CFD programs for the simulation of industrial scale flow problems. With over 220 figures, numerous examples and more than one hundred exercise on FVM numerics, programming, and applications, this textbook is suitable for use in an introductory course on the FVM, in an advanced course on numerics, and as a reference for CFD programmers and researchers.

Download or read book CFD Modeling of Dynamic Inlet Flow Distortion Generation written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating a jet engine into an airframe involves many design and testing steps. The development of high performance fighter aircraft has added new requirements to this process. Ground test facilities are used to simulate the effect of inlet shape on the performance of an engine for cruise flight or other fixed conditions. While a static simulation of the inlet shape is adequate for most circumstance, military fighter craft are highly maneuverable, altering the inlet airflow intensely and briefly. These transient distortions can have a significant impact on performance as well as having the potential of causing structural problems. In addition to airflow changes caused by flight maneuvers, the release of weapons stores into the airstream can introduce transient turbulence and add exhaust gas contaminants. Currently, none of these transient effects are evaluated in wind tunnel ground tests. One solution that has been proposed to address this issue is an array of individually controlled wedges placed in the wind tunnel ahead of the test engine. The wedges could be opened and closed, not only to simulate the given inlet shape, but also transient distortions. Coupled with a system to introduce contaminants into the flow, all manner of transient and static inlet flow distortions could be simulated in a controlled environment. Some investigations have already developed mathematical models of variable angle wedges in a free stream and validated those models with experimental data. If these real world experimental results can be duplicated in a CFD model then ultimately the entire wedge array can be developed virtually to arrive at an optimum design with a relatively small investment. To that end, this study focused on developing a two dimensional CFD model to provide solution data to compare with experimental results in order to determine the feasibility of a more elaborate CFD model as a development tool for the wedge array distortion generator.

Download or read book Applied CFD Analysis of Flow Distortion in the Saab 105 Inlet written by K. P. M. Saterskog and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book OpenFOAM written by J. Miguel Nóbrega and published by Springer. This book was released on 2019-01-24 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains selected papers of the 11th OpenFOAM® Workshop that was held in Guimarães, Portugal, June 26 - 30, 2016. The 11th OpenFOAM® Workshop had more than 140 technical/scientific presentations and 30 courses, and was attended by circa 300 individuals, representing 180 institutions and 30 countries, from all continents. The OpenFOAM® Workshop provided a forum for researchers, industrial users, software developers, consultants and academics working with OpenFOAM® technology. The central part of the Workshop was the two-day conference, where presentations and posters on industrial applications and academic research were shown. OpenFOAM® (Open Source Field Operation and Manipulation) is a free, open source computational toolbox that has a larger user base across most areas of engineering and science, from both commercial and academic organizations. As a technology, OpenFOAM® provides an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics, among several others. Additionally, the OpenFOAM technology offers complete freedom to customize and extend its functionalities.

Download or read book Processing and Validating CFD Data for Estimating Inlet Dynamic Total Pressure Distortion written by S-16 Turbine Engine Inlet Flow Distortion Committee and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The processes addressed in this Aerospace Information Report (AIR) apply to the acquisition and validation of dynamic total-pressure and distortion data from CFD models simulating turbulent flows in inlets. The results of these processes can be used in the formation of an inlet-flow-distortion methodology that addresses turbine-engine operability assessments. Progress is being made in Computational Fluid Dynamic (CFD) methods for correlating with experimental results for internal aerodynamics such as inlet steady-state total-pressure recovery and distortion. Development efforts are focusing on time-accurate CFD technology to estimate inlet peak-dynamic distortion. Validated solutions from CFD tools must be demonstrated to warrant use in official turbine-engine stability audits and/or for selecting worst-case distortion patterns for engine-qualification test demonstrations. This document presents procedures for processing time-dependent total-pressure records from test and CFD, along with approaches for validating time-dependent CFD results used to estimate inlet dynamic-flow distortion.

Download or read book CFD Modeling of Complex Chemical Processes written by Li Xi and published by MDPI. This book was released on 2021-09-01 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational fluid dynamics (CFD), which uses numerical analysis to predict and model complex flow behaviors and transport processes, has become a mainstream tool in engineering process research and development. Complex chemical processes often involve coupling between dynamics at vastly different length and time scales, as well as coupling of different physical models. The multiscale and multiphysics nature of those problems calls for delicate modeling approaches. This book showcases recent contributions in this field, from the development of modeling methodology to its application in supporting the design, development, and optimization of engineering processes.

Download or read book Modeling Internal Flow Using Two Dimensional Computational Fluid Dynamics with Compressor Inlet Distortion written by Marta E. Kernan and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computational Methods in Multiphase Flow VI written by Andrea Alberto Mammoli and published by WIT Press. This book was released on 2011 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase flows, which can involve compressible or incompressible linear or nonlinear, fluids, Are found in all areas of technology, at all length scales and flow regimes. In spite of their ubiquitousness, however multiphase flow continues to be one of the most challenging areas of computational mechanics and experimental methods, with numerous problems remaining unsolved to date. Because the multiphase flow problems are so complex, advanced computational and experimental methods are often required to solve the equations that describe them. The many hhallenges include modelling nonlinear fluids, modelling and tracking interfaces, dealing with multiple length scales, characterizing phase structures, and treating drop breakup and coalescence. Models must be validated, which requires the use of expensive and difficult experimental techniquess. This book presents contributions on the latest research in these techniques, presented at the sixth in a biennial series of conferences on the subject that begain in 2001. Featured topics include: Bubble and drop dynamics, Flow in porous media, Turbulent flow, Multiphase flow simulation, Image processing, Heat transfer, Interaction of gases, liquids and solids, Interface behaviour, Small scale phenomena, Atomization processes, and Liquid film behaviour.

Download or read book CFD Techniques and Thermo Mechanics Applications written by Zied Driss and published by Springer. This book was released on 2018-02-05 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on CFD (Computational Fluid Dynamics) techniques and the recent developments and research works in thermo-mechanics applications. It is devoted to the publication of basic and applied studies broadly related to this area. The chapters present the development of numerical methods, computational techniques, and case studies in the thermo-mechanics applications. They offer the fundamental knowledge for using CFD in real thermo-mechanics applications and complex flow problems through new technical approaches. Also, they discuss the steps in the CFD process and provide benefits and issues when using the CFD analysis in understanding of complicated flow phenomena and its use in the design process. The best practices for reducing errors and uncertainties in CFD analysis are also discussed. The presented case studies and development approaches aim to provide the readers, such as engineers and PhD students, the fundamentals of CFD prior to embarking on any real simulation project. Additionally, engineers supporting or being supported by CFD analysts can benefit from this book. ​

Download or read book CFD Modelling and Simulation of Multiphase Flow in a PEM Fuel Cell Using OpenFOAM written by Jean-Paul Kone and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Inlet Distortion Prediction with a Combined Computational Fluid Dynamics and Distortion Synthesis Approach written by W. P. Norby and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coupled CFD DEM Modeling written by Hamid Reza Norouzi and published by John Wiley & Sons. This book was released on 2016-10-21 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the CFD-DEM method of modeling which combines both the Discrete Element Method and Computational Fluid Dynamics to simulate fluid-particle interactions. Deals with both theoretical and practical concepts of CFD-DEM, its numerical implementation accompanied by a hands-on numerical code in FORTRAN Gives examples of industrial applications

Download or read book Numerical Modelling of Wave Energy Converters written by Matt Folley and published by Academic Press. This book was released on 2016-06-14 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Modelling of Wave Energy Converters: State-of-the Art Techniques for Single WEC and Converter Arrays presents all the information and techniques required for the numerical modelling of a wave energy converter together with a comparative review of the different available techniques. The authors provide clear details on the subject and guidance on its use for WEC design, covering topics such as boundary element methods, frequency domain models, spectral domain models, time domain models, non linear potential flow models, CFD models, semi analytical models, phase resolving wave propagation models, phase averaging wave propagation models, parametric design and control optimization, mean annual energy yield, hydrodynamic loads assessment, and environmental impact assessment. Each chapter starts by defining the fundamental principles underlying the numerical modelling technique and finishes with a discussion of the technique’s limitations and a summary of the main points in the chapter. The contents of the chapters are not limited to a description of the mathematics, but also include details and discussion of the current available tools, examples available in the literature, and verification, validation, and computational requirements. In this way, the key points of each modelling technique can be identified without having to get deeply involved in the mathematical representation that is at the core of each chapter. The book is separated into four parts. The first two parts deal with modelling single wave energy converters; the third part considers the modelling of arrays; and the final part looks at the application of the different modelling techniques to the four most common uses of numerical models. It is ideal for graduate engineers and scientists interested in numerical modelling of wave energy converters, and decision-makers who must review different modelling techniques and assess their suitability and output. Consolidates in one volume information and techniques for the numerical modelling of wave energy converters and converter arrays, which has, up until now, been spread around multiple academic journals and conference proceedings making it difficult to access Presents a comparative review of the different numerical modelling techniques applied to wave energy converters, discussing their limitations, current available tools, examples, and verification, validation, and computational requirements Includes practical examples and simulations available for download at the book’s companion website Identifies key points of each modelling technique without getting deeply involved in the mathematical representation

Download or read book Analysis of Two phase Flows Under Microgravity spatial Conditions Using OpenFOAM written by Carlos Moreno Tavira and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-phase flows have gained importance over the last years due to their multiple and useful applications in space systems. For example, two-phase flows are used in fuel cells micro-channel networks, in the fluid management of Environmental Control and Life Support Systems (ECLSS) or in thermal management systems. However, many problems regarding two-phase flows in microgravity conditions are still open, so further research is needed. In this study, numerical simulations of gas-liquid two-phase flow are performed in a T-junction capillary. Bubbles are formed as a consequence of the interaction between air and water. The geometry used is the same as in [1, 2, 3] in order to make reliable comparisons with the results extracted from the laboratory experiments performed in the mentioned literature. OpenFOAM is used as the main software for the simulations, and ParaView and MATLAB are used to post-process the data. InterFoam is selected as the solver since it uses an incompressible, immiscible and isothermal Volume of Fluid (VOF) method. Some validations were made before setting up the definitive cases of the simulations. These validations were related to the adequate capillary length in order to obtain fully-developed flows, to the appropriate mesh quality to get good results and maintain an acceptable computational complexity, to the optimal contact angle value to get close to reality bubble behavior in terms of adherence to the walls, and to the right location of the sampling surfaces responsible for extracting the data. An analysis of the fluid velocity profiles along both of the capillaries of the T-junction was also made. Bubbles are analyzed in terms of their generating frequency, volume, length and velocity. Bubble volume dispersion is quantified using the polydispersity index. A pressure probe is used to measure the gauge pressure at the very center of the T-junction. Visual comparisons are made between simulation bubbles and experimental bubbles. In the end, the results of the simulations qualitatively fitted the experimental data, validating Computational Fluid Dynamics (CFD) as an alternative and correct tool to perform two-phase flow studies under microgravity conditions.

Download or read book CFD Study of Two phase Flows in Hypergravity Conditions with OpenFOAM written by Adrià Espinosa Miguel and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays we are in the greatest space and air era ever, in which technology has been forced to develop up to the point of being applied in gravity conditions that cannot be found on Earth surface. The application of two-phase fluid systems in spacecraft are of great interest to this sector due to its advantages, including: weigh reduction, enhanced performance and efficiency improvement, all of them in comparison with mono-phase fluids. The most remarkable examples where are used biphasic fluids are space bioreactors, chemical gas-liquid contactors, propulsion systems, thermal management systems including fuel or electronics cooling, and spatial life-support systems. Even though the wide variety of technological applications, there are very few hypergravity studies and most of them focus on making spacecraft's components the more resistant as possible. Therefore, the fluid flow research in hypergravity conditions is a very unknown area that requires further investigation. Some years ago Francesc Sunol and Ricard Gonz ̃ alez-Cinca performed an experimental ́ analysis of the effects of gravity on bubble formation and rise in a low viscosity liquid (distilled-water). This study was carried in the hypergravity environment generated by the large diameter centrifuge of the European Space Agency. So, in the work presented it has been reproduced the mentioned research with a CFD software called OpenFOAM with two main objectives: analyse the same aspects regarding the bubble formation and rise processes, since its behaviour changes as the gravity level increases, and compare the results obtained from the numerical simulations with the previous ones, in order to validate the CFD program for this use. This project has an important part that consists in validations, where we have studied the most important parameters for the simulations, such as: the contact angle of the fluid and the convergence of the mesh and time step. In addition to the analysis of the transient between two consecutive bubbles, and the bubble formation process in normal gravity and in hypergravity conditions. Then, we performed the final tests to study the bubble rise velocity and volume. The corresponding simulations were set in different hypergravity conditions, for three gas injection velocities: 0.03m/s, 0.06m/s and 0.1m/s. Finally, comparing the OpenFOAM results with the ones obtained in the previous research, it can be stated that CFD software can reproduce a fluid flow experiment successfully. The detachment of the bubble from the capillary is determined by surface tensions and buoyancy force, although at higher gravity levels this process is accelerated. Posterior bubble rise follows a zig-zag path that is destabilized and accelerated as gravitational effects increase, which leads to a variation in the oscillation amplitude and frequency, as shown in [1].

Download or read book Aerial Robots written by Omar D Lopez Mejia and published by BoD – Books on Demand. This book was released on 2017-09-06 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few years ago, the topic of aerial robots was exclusively related to the robotics community, so a great number of books about the dynamics and control of aerial robots and UAVs have been written. As the control technology for UAVs advances, the great interaction that exists between other systems and elements that are as important as control such as aerodynamics, energy efficiency, acoustics, structural integrity, and applications, among others has become evident. Aerial Robots - Aerodynamics, Control, and Applications is an attempt to bring some of these topics related to UAVs together in just one book and to look at a selection of the most relevant problems of UAVs in a broader engineering perspective.