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Interactions Between Turbulent Convection And Thermal Radiation In Direct Numerical Simulations
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Book Synopsis Interactions Between Turbulent Convection and Thermal Radiation in Direct Numerical Simulations by : Tomasz Czarnota
Download or read book Interactions Between Turbulent Convection and Thermal Radiation in Direct Numerical Simulations written by Tomasz Czarnota and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Numerical Simulation for Turbulent Reacting Flows by : Thierry Baritaud
Download or read book Direct Numerical Simulation for Turbulent Reacting Flows written by Thierry Baritaud and published by Editions TECHNIP. This book was released on 1996 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Description of accurate boundary conditions for the simulation of reactive flows. Parallel direct numerical simulation of turbulent reactive flow. Flame-wall interaction and heat flux modelling in turbulent channel flow. A numerical study of laminar flame wall interaction with detailed chemistry: wall temperature effects. Modeling and simulation of turbulent flame kernel evolution. Experimental and theoretical analysis of flame surface density modelling for premixed turbulent combustion. Gradient and counter-gradient transport in turbulent premixed flames. Direct numerical simulation of turbulent flames with complex chemical kinetics. Effects of curvature and unsteadiness in diffusion flames. Implications for turbulent diffusion combustion. Numerical simulations of autoignition in turbulent mixing flows. Stabilization processes of diffusion flames. References.
Book Synopsis Turbulence and Interactions by : Michel O. Deville
Download or read book Turbulence and Interactions written by Michel O. Deville and published by Springer. This book was released on 2014-06-13 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a snapshot of the state-of-art in the field of turbulence modeling and covers the latest developments concerning direct numerical simulations, large eddy simulations, compressible turbulence, coherent structures, two-phase flow simulation and other related topics. It provides readers with a comprehensive review of both theory and applications, describing in detail the authors’ own experimental results. The book is based on the proceedings of the third Turbulence and Interactions Conference (TI 2012), which was held on June 11-14 in La Saline-les-Bains, La Réunion, France and includes both keynote lectures and outstanding contributed papers presented at the conference. This multifaceted collection, which reflects the conference ́s emphasis on the interplay of theory, experiments and computing in the process of understanding and predicting the physics of complex flows and solving related engineering problems, offers a practice-oriented guide for students, researchers and professionals in the field of computational fluid dynamics, turbulence modeling and related areas.
Book Synopsis Direct Numerical Simulation and Radiation Monte Carlo for Turbulence?radiation Interactions in Combustion Systems by : Kshitij V. Deshmukh
Download or read book Direct Numerical Simulation and Radiation Monte Carlo for Turbulence?radiation Interactions in Combustion Systems written by Kshitij V. Deshmukh and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent combustion is encountered in many industrial applications such as combustors, nozzles, turbines, engines and furnaces. The increasing concern for pollutant emissions to the environment has led to a wide interest in studying the process in detail using numerical simulation with an aim to develop predictive models that would minimize expensive experiments. Three main approaches in this direction are direct numerical simulation (DNS), large eddy simulation (LES) and Reynolds average simulation (RAS). Moreover, the presence of high temperatures in turbulent combustion results in substantial heat transfer by radiation. Most work until today has either simplified or neglected radiation. This leads to neglect of turbulence?radiation interactions (TRI). In this work, DNS is coupled with a photon Monte Carlo method to solve the radiative transfer equation (RTE) to isolate and quantify TRI. A canonical statistically one-dimensional turbulent premixed combustion system is studied. The inflow boundary condition is improved to introduce turbulence and to help simulate a quasi-stationary flow. Both emission TRI and absorption TRI were found to be significant. A statistical analysis showed that using a moving average over time of the radiative source term reduces statistical noise and saves valuable computational resources without affecting the overall solution. For the first time, a third-order spherical harmonics method, P3 approximation is coupled with DNS to replace the photon Monte Carlo method. A canonical turbulent premixed combustion system is simulated and TRI are studied at large-to-small optical thicknesses. Emission TRI was found to be significant at all optical thickness, while absorption TRI was important at large and intermediate optical thickness and negligible at the optically thin limit. The implementation of the P3 approximation is seen as a viable alternative to the costly photon Monte Carlo method. Elliptic equations are typically solved in RAS-based and LES-based modeling and the P3 approximation consists of six elliptical partial differential equations (PDEs). It is hoped that the demonstration of use of the P3 approximation will generate interest for it to be included in future LES and RAS approaches and developments. A low-order model for LES using a?-PDF approach is also developed for a canonical statistically one-dimensional turbulent nonpremixed system. The mixture fraction and its variance are inputs to the model to obtain a PDF of mixture fraction. With the knowledge of the PDF of mixture fraction, the quantities that are functions of mixture fraction are convoluted with the mixture fraction PDF to obtain the chemical source term and the radiative emission terms. The mean profiles are predicted correctly but the nonlinear terms of radiative emission are not captured accurately, as the?-PDF cannot provide information for the higher-order terms. Still, as a one-equation model to be used as a first pass for LES simulation, this model has its advantages in that it is easy to implement and uses negligible additional computational resources over what is required for LES without any models.
Book Synopsis Direct Numerical Simulations of Turbulent Thermal Convection by :
Download or read book Direct Numerical Simulations of Turbulent Thermal Convection written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence and Interactions by : Michel Deville
Download or read book Turbulence and Interactions written by Michel Deville and published by Springer. This book was released on 2014-10-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keynote Lectures.- Some Characteristics of Non-Reacting and Reacting Low Swirl Number Jets.- Inner-Outer Interactions in Wall-Bounded Turbulence.- Turbulence Interaction with Atmospheric Physical Processes.- LES of Pulsating Turbulent Flows over Smooth and Wavy Boundaries.- Numerical Study of Turbulence-Wave Interaction.- High Reynolds Number Wall-Bounded Turbulence and a Proposal for a New Eddy-Based Model.- Regular Papers.- PANS Methodology Applied to Elliptic-Relaxation Based Eddy Viscosity Transport Model.- PIV Study of Turbulent Flow in Porous Media.- A Model for Dissipation: Cascade SDE with Markov Regime-Switching and Dirichlet Prior.- Wavelet Analysis of the Turbulent LES Data of the Lid-Driven Cavity Flow.- A Two-Phase LES Compressible Model for Plasma-Liquid Jet Interaction.- Simulation of a Fluidized Bed Using a Hybrid Eulerian-Lagrangian Method for Particle Tracking.- Wavelet-Adapted Sub-grid Scale Models for LES.- Effect of Particle-Particle Collisions on the Spatial Distribution of Inertial Particles Suspended in Homogeneous Isotropic Turbulent Flows.- Effect of Near-Wall Componental Modification of Turbulence on Its Statistical Properties.- Large-Eddy Simulation of Transonic Buffet over a Supercritical Airfoil.- Large Eddy Simulation of Coherent Structures over Forest Canopy.- Toroidal/Poloidal Modes Dynamics in Anisotropic Turbulence.- Grid Filter Modeling for Large-Eddy Simulation.- Pulsating Flow through Porous Media.- Thermodynamic Fluctuations Behaviour during a Sheared Turbulence/Shock Interaction.- LES and DES Study of Fluid-Particle Dynamics in a Human Mouth-Throat Geometry.- Viscous Drag Reduction with Surface-Embedded Grooves.- Study on the Resolution Requirements for DNS in Turbulent Rayleigh-Bénard Convection.- On the Role of Coherent Structures in a Lid Driven Cavity Flow.- Local versus Nonlocal Processes in Turbulent Flows, Kinematic Coupling and General Stochastic Processes.- Time-Resolved 3D Simulation of an Aircraft Wing with Deployed High-Lift System.- Fluid Mechanics and Heat Transfer in a Channel with Spherical and Oval Dimples.- Investigation of the Flow around a Cylinder Plate Configuration with Respect to Aerodynamic Noise Generation Mechanisms.- LES of the Flow around Ahmed Body with Active Flow Control.- Enhanced Bubble Migration in Turbulent Channel Flow by an Acceleration-Dependent Drag Coefficient.- Experimental and Numerical Study of Unsteadiness in Boundary Layer / Shock Wave Interaction.- Measurement of Particle Accelerations with the Laser Doppler Technique.- A Novel Numerical Method for Turbulent, Two-Phase Flow.- Modeling of High Reynolds Number Flows with Solid Body Rotation or Magnetic Fields.- Direct Numerical Simulation of Buoyancy Driven Turbulence inside a Cubic Cavity.- Numerical Simulations of a Massively Separated Reactive Flow Using a DDES Approach for Turbulence Modelling.- Particle Dispersion in Large-Eddy Simulations: Influence of Reynolds Number and of Subgrid Velocity Deconvolution.- Use of Lagrangian Statistics for the Direct Analysis of the Turbulent Constitutive Equation.- Numerical Simulation of Supersonic Jet Noise with Overset Grid Techniques.- Large Eddy Simulation of Turbulent Jet Flow in Gas Turbine Combustors.- Computations of the Flow around a Wind Turbine: Grid Sensitivity Study and the Influence of Inlet Conditions.- Stochastic Synchronization of the Wall Turbulence.- Large-Eddy Simulations of an Oblique Shock Impinging on a Turbulent Boundary Layer: Effect of the Spanwise Confinement on the Low-Frequency Oscillations.- Parameter-Free Symmetry-Preserving Regularization Modelling of Turbulent Natural Convection Flows.- An a Priori Study for the Modeling of Subgrid Terms in Multiphase Flows.- Computation of Flow in a 3D Diffuser Using a Two-Velocity Field Hybrid RANS/LES.- On the Dynamics of High Reynolds Number Turbulent Axisymmetric and Plane Separating/Reattaching Flows.- Numerical Simulation and Statistical Modeling of Inertial Droplet Coalescence
Book Synopsis Numerical Simulation of the Interaction Between an External Flow, Laminar Or Turbulent, and Liquid/vapor Phase Change by : Elena-Roxana Popescu (docteur en mécanique des fluides).)
Download or read book Numerical Simulation of the Interaction Between an External Flow, Laminar Or Turbulent, and Liquid/vapor Phase Change written by Elena-Roxana Popescu (docteur en mécanique des fluides).) and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a launcher tank, the cryogenic fuel can suffer a liquid/vapor phase change due to a thermal gradient induced by solar radiation or by engines residual thermal diffusion. The quantity of vapor released by the phase change process can highly increase the internal pressure. Due to a poor knowledge of these phenomena, at present, the operations led to regulate the internal pressure induce fuel loss. It is therefore of great importance to investigate the liquid/vapor phase and the physical processes taking place at the interface. This is the context of the present thesis, thattakes place in an effort to extract better understanding of the above underlined phenomena by means of Direct Numerical Simulation (DNS). The work is split into three studies : the interaction between a liquid pool at saturation and an external flow of subcooled or superheated vapor, both in laminar and turbulent regime flows, and the interaction between natural convection mouvements and liquid/vapor phase change. Firstly, the laminar regime flow is investigated. In this framework, a parametric study is conducted with the objective of finding behaviour laws for the heat transfer and the friction coefficient at the interface between a static liquid pool at saturation temperature and a laminar boundary layer flow of vapor. Both vaporization and condensation are studied. The second project was on the numerical simulation of a turbulent boundary layer flow of superheated vapor interacting with the velocity field induced by vaporization. To this extent, a turbulent fluctuations injector is implemented and validated for the spatial development of a boundary layer flow over a flat plate with heat transfer. A study on the influence of the velocity field induced by vaporization on the Nusselt number, the friction coefficient, the Stanton number and the turbulent quantities is conducted. Finally, we lead a preliminary numerical study on a configuration describing the interaction between natural convection flow and liquid/vapor phase change in a cryogenic tank. A new solver is implemented in the in house code to account for the density variations in the liquid. Preliminary results are obtained on the influence of the Grashof number on the thermal flux at the liquid/vapor interface.
Book Synopsis Numerical Modeling of Turbulent Convection in Rough Rayleigh-Bénard Cell by : Mebarek Belkadi
Download or read book Numerical Modeling of Turbulent Convection in Rough Rayleigh-Bénard Cell written by Mebarek Belkadi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent convective flows over rough boundaries are ubiquitous in geophysical and engineering applications. Understanding the mechanisms of these interactions is substantial for improving the heat transfer efficiency. In this work we study the effects of wall roughness on the Rayleigh Bénard turbulence. Three dimensional direct numerical simulations (DNS) are performed using a parallel CFD code under the support of national high performance computers. The roughness elements are embedded over hotted surface using an immersed boundary method. The numerical configuration allow the identification of three successive regimes from a thermally resistant to highly enhanced heat transfer. Through a geometrical decomposition of the rough plate into plot and surrounding fluid, we examine their different behaviors, mainly the contribution to the heat transfer. We analyze the effects of roughness on thermal and viscous boundary layers structures and on the flow physics near the wall. Besides that, the comparison with experimental data at the roughness scale highlight the non homogeneity of thermal fluctuations around the obstacles. We also focused on the effects of roughness on the flow dynamics and on the properties of thermal plumes.
Book Synopsis Direct and Large Eddy Simulation XIII by : Cristian Marchioli
Download or read book Direct and Large Eddy Simulation XIII written by Cristian Marchioli and published by Springer Nature. This book was released on 2023-11-15 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the diverse and cutting-edge research presented at the 13th ERCOFTAC Workshop on Direct and Large Eddy Simulation. The first section of the book focuses on Aerodynamics/Aeroacoustics, comprising eight papers that delve into the intricate relationship between fluid flow and aerodynamic performance. The second section explores the dynamics of Bluff/Moving Bodies through four insightful papers. Bubbly Flows, the subject of the third section, is examined through four papers. Moving on, the fourth section is dedicated to Combustion and Reactive Flows, presenting two papers that focus on the complex dynamics of combustion processes and the interactions between fluids and reactive species. Convection and Heat/Mass Transfer are the central themes of the fifth section, which includes three papers. These contributions explore the fundamental aspects of heat and mass transfer in fluid flows, addressing topics such as convective heat transfer, natural convection, and mass transport phenomena. The sixth section covers Data Assimilation and Uncertainty Quantification, featuring two papers that highlight the importance of incorporating data into fluid dynamic models and quantifying uncertainties associated with these models. The subsequent sections encompass a wide range of topics, including Environmental and Industrial Applications, Flow Separation, LES Fundamentals and Modelling, Multiphase Flows, and Numerics and Methodology. These sections collectively present a total of 23 papers that explore different facets of fluid dynamics, contributing to the advancement of the field and its practical applications.
Book Synopsis Direct and Large Eddy Simulation of Turbulence by : U. Schumann
Download or read book Direct and Large Eddy Simulation of Turbulence written by U. Schumann and published by . This book was released on 1986 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cmptr & Computing in Heat Transfer Sci & Engin by : Wataru Nakayama
Download or read book Cmptr & Computing in Heat Transfer Sci & Engin written by Wataru Nakayama and published by Begell House Publishers. This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on the interactions between computers and heat transfer science and engineering. The book provides broad coverage of heat transfer phenomena including forced convection, phase changes, radiative heat transfer, and heat transfer in combustion.
Book Synopsis Engineering Turbulence Modelling and Experiments 5 by : W. Rodi
Download or read book Engineering Turbulence Modelling and Experiments 5 written by W. Rodi and published by Elsevier. This book was released on 2002-08-21 with total page 1029 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.
Book Synopsis Proceedings of the IUTAM Symposium on Turbulent Structure and Particles-Turbulence Interaction by : Xiaojing Zheng
Download or read book Proceedings of the IUTAM Symposium on Turbulent Structure and Particles-Turbulence Interaction written by Xiaojing Zheng and published by Springer Nature. This book was released on 2024-01-02 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the 'IUTAM Symposium on Turbulent Structure and Particles' held in 2023. It provides a comprehensive overview of the latest research and developments in the field of turbulent dispersed multiphase flows. The book features contributions from experts in academia and industry, covering a range of topics including droplet and pollutant dispersion, sand/dust storms, sediment transport in water or air flows, fluidized beds, bubbly flows and more. The content is a valuable reference for researchers, engineers, and students who are interested in understanding the complex behavior of multiphase flows in different natural and industrial environments.
Book Synopsis CRC Handbook of Thermal Engineering by : Raj P. Chhabra
Download or read book CRC Handbook of Thermal Engineering written by Raj P. Chhabra and published by CRC Press. This book was released on 2017-11-08 with total page 1801 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CRC Handbook of Thermal Engineering, Second Edition, is a fully updated version of this respected reference work, with chapters written by leading experts. Its first part covers basic concepts, equations and principles of thermodynamics, heat transfer, and fluid dynamics. Following that is detailed coverage of major application areas, such as bioengineering, energy-efficient building systems, traditional and renewable energy sources, food processing, and aerospace heat transfer topics. The latest numerical and computational tools, microscale and nanoscale engineering, and new complex-structured materials are also presented. Designed for easy reference, this new edition is a must-have volume for engineers and researchers around the globe.
Book Synopsis Numerical Simulations of Magnetohydrodynamic Flow and Heat Transfer by : Amar KC
Download or read book Numerical Simulations of Magnetohydrodynamic Flow and Heat Transfer written by Amar KC and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamic (MHD) natural convection in a porous medium with low-magnetic Reynolds number (Re[subscript m]) is investigated in a rectangular cavity with isothermal walls on the left and right and adiabatic walls on the top and bottom. The validity of Darcy's law is addressed for high-Rayleigh number (Ra) flows with high permeability, where the velocity-pressure gradient relationship transitions from linear (i.e. the Darcy law) to nonlinear, due to the fact that the form drag due to solid obstacles is now comparable with the surface drag due to friction, which in turn results in the Darcy-Forchheimer law. In addition, the effect of different magnetic field strengths in terms of Hartmann numbers (Ha) is also investigated for cavities for varying aspect ratios to analyze how the flow and thermal characteristics in a porous medium are influenced by the applied magnetic field. Here, the interaction between the fluid velocity and the electromagnetic forces gives rise to different flow scenarios. In particular, the influence of magnetic field under the varying conditions of convective currents (through Ra) and length scales (through aspect ratios) on quantities such as stream function, temperature and Nusselt number, Nu is studied. Assessment of three regularization-based models and two eddy-viscosity-based subgrid-scale (SGS) turbulence models for large eddy simulations (LES) are carried out for MHD decaying homogeneous turbulence (DHT) and MHD transition to turbulence for the Taylor-Green vortex (TGV) through comparisons to direct numerical simulations (DNS). Simulations are conducted using the low-magnetic Reynolds number approximation (Re[subscript m] “ 1) and the initially-isotropic turbulence problem has a Taylor scale Reynolds number (Re[subscript lambda]) of 120. LES predictions using the Leray-[alpha], LANS-[alpha], and Clark-[alpha] regularization-based SGS models are compared to the classic non-dynamic Smagorinsky and the dynamic Smagorinsky models. Regarding the regularization models, this work represents their first application to MHD decaying turbulence or transition-to-turbulence problems. Analyses of turbulent kinetic energy decay rates, energy spectra, and vorticity fields are made between the varying magnetic field cases. Overall, the regularization models did poorly compared to the eddy-viscosity models for all MHD cases, but the comparisons improved as the magnetic field increase in magnitude.
Book Synopsis Research Directions in Computational Mechanics by : National Research Council
Download or read book Research Directions in Computational Mechanics written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational mechanics is a scientific discipline that marries physics, computers, and mathematics to emulate natural physical phenomena. It is a technology that allows scientists to study and predict the performance of various productsâ€"important for research and development in the industrialized world. This book describes current trends and future research directions in computational mechanics in areas where gaps exist in current knowledge and where major advances are crucial to continued technological developments in the United States.
Book Synopsis A Direct Numerical Simulation of Fully Developed Turbulent Channel Flow with Passive Heat Transfer by : Stephen Lincoln Lyons
Download or read book A Direct Numerical Simulation of Fully Developed Turbulent Channel Flow with Passive Heat Transfer written by Stephen Lincoln Lyons and published by . This book was released on 1989 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct numerical simulation of a fully developed turbulent channel flow with passive heat transfer is performed. The time-dependent three-dimensional Navier-Stokes equations and advection-diffusion equation are solved numerically using a pseudospectral technique with 1,064,960 grid points in physical space (128 x 65 x 128 in x, y, z). No subgrid scale model is employed since all essential turbulence scales are resolved. The Reynolds number is 2262, based on the half channel height and bulk velocity, and the Prandtl number is 1. The Nusselt number is predicted to be 25.36. A large number of one-point turbulence statistics are computed and compared with existing experimental data taken at similar Reynolds and Nusselt numbers. Agreement with the existing experimental data is excellent except for some discrepancies in the near wall region, y$sp+$ $
