Author: Nadezda PetrovaPublisher:
ISBN:
Category :
Languages : en
Pages : 316
Book Description
Turbulence-chemistry Interaction Models for Numerical Simulation of Aeronautical Propulsion Systems
Author: Nadezda PetrovaModeling and Simulation of Turbulent Mixing and Reaction
Author: Daniel LivescuPublisher: Springer Nature
ISBN: 9811526435
Category : Technology & Engineering
Languages : en
Pages : 273
Book Description
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.
Compressible Turbulent Reading Flows
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Research was conducted under this grant to advance fundamental understanding and predictive models of turbulent reacting flows relevant to Air Force needs in high-speed propulsion Advanced computational schemes including direct numerical simulation (DNS) and large eddy simulation (LES) were used in addition to turbulent combustion theory. Reduced chemical mechanisms for hydrogen-air combustion were developed and tested. Specific flows investigated include the reacting shear layer and the jet. A new mechanism that relates the reduction in fuel/oxidant mixing in high-speed flows to the inhibited communication of pressure signals was proposed. A resulting compressibility model was found to give good predictions. Both mean density changes and Mach number were found to affect the flow development in high-speed combustion. It was found that the transport and molecular mixing of reactive scalars are substantially affected by heat release and must be accounted for in closures of turbulence/chemistry interaction. LES of a spatially-evolving jet were performed and successfully compared with our DNS and previous experiments. New subgrid scale models were developed for LES of nonequilibrium flows. The results obtained here should help improve current abilities to analyze and design propulsion systems that employ high-speed turbulent combustion.
Workshop on Computational Turbulence Modeling
Author: Engineering Turbulence Modelling and Experiments 6
Author: Wolfgang RodiPublisher: Elsevier
ISBN: 0080530958
Category : Science
Languages : en
Pages : 1011
Book Description
Proceedings of the world renowned ERCOFTAC (International Symposium on Engineering Turbulence Modelling and Measurements). The proceedings include papers dealing with the following areas of turbulence: · Eddy-viscosity and second-order RANS models · Direct and large-eddy simulations and deductions for conventional modelling · Measurement and visualization techniques, experimental studies · Turbulence control · Transition and effects of curvature, rotation and buoyancy on turbulence · Aero-acoustics · Heat and mass transfer and chemically reacting flows · Compressible flows, shock phenomena · Two-phase flows · Applications in aerospace engineering, turbomachinery and reciprocating engines, industrial aerodynamics and wind engineering, and selected chemical engineering problems Turbulence remains one of the key issues in tackling engineering flow problems. These problems are solved more and more by CFD analysis, the reliability of which depends strongly on the performance of the turbulence models employed. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation. As in other fields of Science, in the rapidly developing discipline of turbulence, swift progress can be achieved only by keeping up to date with recent advances all over the world and by exchanging ideas with colleagues active in related fields.
Direct Numerical Simulation of Turbulence-Chemistry Interactions
Author: Advanced Approaches in Turbulence
Author: Paul DurbinPublisher: Elsevier
ISBN: 0128208902
Category : Technology & Engineering
Languages : en
Pages : 554
Book Description
Advanced Approaches in Turbulence: Theory, Modeling, Simulation and Data Analysis for Turbulent Flows focuses on the updated theory, simulation and data analysis of turbulence dealing mainly with turbulence modeling instead of the physics of turbulence. Beginning with the basics of turbulence, the book discusses closure modeling, direct simulation, large eddy simulation and hybrid simulation. The book also covers the entire spectrum of turbulence models for both single-phase and multi-phase flows, as well as turbulence in compressible flow. Turbulence modeling is very extensive and continuously updated with new achievements and improvements of the models. Modern advances in computer speed offer the potential for elaborate numerical analysis of turbulent fluid flow while advances in instrumentation are creating large amounts of data. This book covers these topics in great detail. Covers the fundamentals of turbulence updated with recent developments Focuses on hybrid methods such as DES and wall-modeled LES Gives an updated treatment of numerical simulation and data analysis
Mathematical and Numerical Foundations of Turbulence Models and Applications
Author: Tomás Chacón RebolloPublisher: Springer
ISBN: 1493904558
Category : Mathematics
Languages : en
Pages : 530
Book Description
With applications to climate, technology, and industry, the modeling and numerical simulation of turbulent flows are rich with history and modern relevance. The complexity of the problems that arise in the study of turbulence requires tools from various scientific disciplines, including mathematics, physics, engineering and computer science. Authored by two experts in the area with a long history of collaboration, this monograph provides a current, detailed look at several turbulence models from both the theoretical and numerical perspectives. The k-epsilon, large-eddy simulation and other models are rigorously derived and their performance is analyzed using benchmark simulations for real-world turbulent flows. Mathematical and Numerical Foundations of Turbulence Models and Applications is an ideal reference for students in applied mathematics and engineering, as well as researchers in mathematical and numerical fluid dynamics. It is also a valuable resource for advanced graduate students in fluid dynamics, engineers, physical oceanographers, meteorologists and climatologists.
Scientific and Technical Aerospace Reports
Author: Modeling Complex Turbulent Flows
Author: Manuel D. SalasPublisher: Springer Science & Business Media
ISBN: 9401147248
Category : Science
Languages : en
Pages : 385
Book Description
Turbulence modeling both addresses a fundamental problem in physics, 'the last great unsolved problem of classical physics,' and has far-reaching importance in the solution of difficult practical problems from aeronautical engineering to dynamic meteorology. However, the growth of supercom puter facilities has recently caused an apparent shift in the focus of tur bulence research from modeling to direct numerical simulation (DNS) and large eddy simulation (LES). This shift in emphasis comes at a time when claims are being made in the world around us that scientific analysis itself will shortly be transformed or replaced by a more powerful 'paradigm' based on massive computations and sophisticated visualization. Although this viewpoint has not lacked ar ticulate and influential advocates, these claims can at best only be judged premature. After all, as one computational researcher lamented, 'the com puter only does what I tell it to do, and not what I want it to do. ' In turbulence research, the initial speculation that computational meth ods would replace not only model-based computations but even experimen tal measurements, have not come close to fulfillment. It is becoming clear that computational methods and model development are equal partners in turbulence research: DNS and LES remain valuable tools for suggesting and validating models, while turbulence models continue to be the preferred tool for practical computations. We believed that a symposium which would reaffirm the practical and scientific importance of turbulence modeling was both necessary and timely.