Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth PDF full book. Access full book title Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth by Mohammad Hashemi. Download full books in PDF and EPUB format.
Author: Mohammad Hashemi
Publisher:
ISBN:
Category : Dendrites
Languages : en
Pages : 53
Get Book Here
Book Description
A two-dimensional (2D) and a three-dimensional (3D) lattice Boltzmann (LB) and Cellular Automaton (CA) models were developed to study the buoyancy-induced mechanism of micro-segregation defects leading to formation of freckles in solidification of binary alloys. The channel-like defects that form during solidification have a significant influence on mechanical properties of the cast products. 3D simulations can provide a more profound insight about the mechanism of freckle formation, in comparison with the previous two-dimensional simulations. In the present work, lattice Boltzmann method (LBM) is used to solve for transport phenomena, while CA is employed to capture the solidification interface. Considering the local nature of LB and CA methods, combination of the two methods is a decent choice for large-scale parallelization. The model can be used to simulate dendritic growth, micro-segregation and freckle formation during solidification of metallic alloys in large-scale domains. The computer simulation results indicate that an instability in the fluid density leads to a competition among dendrites that retards growth of some dendrites and accelerates the others. The solute-rich channels which survive during this competition will solidify in the form of freckles.
Author: Mohammad Hashemi
Publisher:
ISBN:
Category : Dendrites
Languages : en
Pages : 53
Get Book Here
Book Description
A two-dimensional (2D) and a three-dimensional (3D) lattice Boltzmann (LB) and Cellular Automaton (CA) models were developed to study the buoyancy-induced mechanism of micro-segregation defects leading to formation of freckles in solidification of binary alloys. The channel-like defects that form during solidification have a significant influence on mechanical properties of the cast products. 3D simulations can provide a more profound insight about the mechanism of freckle formation, in comparison with the previous two-dimensional simulations. In the present work, lattice Boltzmann method (LBM) is used to solve for transport phenomena, while CA is employed to capture the solidification interface. Considering the local nature of LB and CA methods, combination of the two methods is a decent choice for large-scale parallelization. The model can be used to simulate dendritic growth, micro-segregation and freckle formation during solidification of metallic alloys in large-scale domains. The computer simulation results indicate that an instability in the fluid density leads to a competition among dendrites that retards growth of some dendrites and accelerates the others. The solute-rich channels which survive during this competition will solidify in the form of freckles.
Author: Nanqiao Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Analyses of heat and mass transfer between different materials and phases are essential in numerous fundamental scientific problems and practical engineering applications, such as thermal and chemical transport in porous media, design of heat exchangers, dendritic growth during solidification, and thermal/mechanical analysis of additive manufacturing processes. In the numerical simulation, interface treatment can be further divided into sharp interface schemes and diffuse interface schemes according to the morphological features of the interface. This work focuses on the following subjects through computational studies: (1) critical evaluation of the various sharp interface schemes in the literature for conjugate heat and mass transfer modeling with the lattice Boltzmann method (LBM), (2) development of a novel sharp interface scheme in the LBM for conjugate heat and mass transfer between materials/phases with very high transport property ratios, and (3) development of a new diffuse-interface phase-field-lattice Boltzmann method (PFM/LBM) for dendritic growth and solidification modeling. For comparison of the previous sharp interface schemes in the LBM, the numerical accuracy and convergence orders are scrutinized with representative test cases involving both straight and curved geometries. The proposed novel sharp interface scheme in the LBM is validated with both published results in the literature as well as in-house experimental measurements for the effective thermal conductivity (ETC) of porous lattice structures. Furthermore, analytical correlations for the normalized ETC are proposed for various material pairs and over the entire range of porosity based on the detailed LBM simulations. In addition, we provide a modified correlation based on the SS420-air and SS316L-air metal pairs and the high porosity range for specific application. The present PFM/LBM model has several improved features compared to those in the literature and is capable of modeling dendritic growth with fully coupled melt flow and thermosolutal convection-diffusion. The applicability and accuracy of the PFM/LBM model is verified with numerical tests including isothermal, iso-solutal and thermosolutal convection-diffusion problems in both 2D and 3D. Furthermore, the effects of natural convection on the growth of multiple crystals are numerically investigated.
Author: Laurentiu Nastac
Publisher: Springer
ISBN: 3319651331
Category : Technology & Engineering
Languages : en
Pages : 278
Get Book Here
Book Description
Author: T.S. Srivatsan
Publisher: CRC Press
ISBN: 1351597191
Category : Technology & Engineering
Languages : en
Pages : 790
Get Book Here
Book Description
Manufacturing Techniques for Materials: Engineering and Engineered provides a cohesive and comprehensive overview of the following: (i) prevailing and emerging trends, (ii) emerging developments and related technology, and (iii) potential for the commercialization of techniques specific to manufacturing of materials. The first half of the book provides the interested reader with detailed chapters specific to the manufacturing of emerging materials, such as additive manufacturing, with a valued emphasis on the science, technology, and potentially viable practices specific to the manufacturing technique used. This section also attempts to discuss in a lucid and easily understandable manner the specific advantages and limitations of each technique and goes on to highlight all of the potentially viable and emerging technological applications. The second half of this archival volume focuses on a wide spectrum of conventional techniques currently available and being used in the manufacturing of both materials and resultant products. Manufacturing Techniques for Materials is an invaluable tool for a cross-section of readers including engineers, researchers, technologists, students at both the graduate level and undergraduate level, and even entrepreneurs.
Author: Wolfgang E. Nagel
Publisher: Springer Nature
ISBN: 3031468708
Category :
Languages : en
Pages : 467
Get Book Here
Book Description
Author: Laurentiu Nastac
Publisher: Springer
ISBN: 3319481177
Category : Technology & Engineering
Languages : en
Pages : 419
Get Book Here
Book Description
This collection encompasses the following four areas: (1) Solidification processing: theoretical and experimental investigations of solidification processes including castings solidification, directional solidification of alloys, electromagnetic stirring, ultrasonic cavitation, mechanical vibration, active cooling and heating, powder bed-electron beam melting additive manufacturing, etc. for processing of metals, polymers and composite materials; (2) Microstructure Evolution: theoretical and experimental studies related to microstructure evolution of materials including prediction of solidification-related defects and particle pushing/engulfment aspects; (3) Novel Casting and Molding Processes: modeling and experimental aspects including high pressure die casting, permanent casting, centrifugal casting, low pressure casting, 3D silica sand mold printing, etc.; and (4) Cast Iron: all aspects related to cast iron characterization, computational and analytical modeling, and processing.
Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
ISBN: 1118663136
Category : Technology & Engineering
Languages : en
Pages : 1238
Get Book Here
Book Description
Presenting papers from the 2013 annual meeting of The Minerals, Metals & Materials Society (TMS), this volume covers developments in all aspects of high temperature electrochemistry, from the fundamental to the empirical and from the theoretical to the applied.
Author: Michael C. Sukop
Publisher: Springer Science & Business Media
ISBN: 3540279822
Category : Science
Languages : en
Pages : 178
Get Book Here
Book Description
Here is a basic introduction to Lattice Boltzmann models that emphasizes intuition and simplistic conceptualization of processes, while avoiding the complex mathematics that underlies LB models. The model is viewed from a particle perspective where collisions, streaming, and particle-particle/particle-surface interactions constitute the entire conceptual framework. Beginners and those whose interest is in model application over detailed mathematics will find this a powerful 'quick start' guide. Example simulations, exercises, and computer codes are included.
Author: Wilfried Kurz
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 305
Get Book Here
Book Description
Author: Timm Krüger
Publisher: Springer
ISBN: 3319446495
Category : Science
Languages : en
Pages : 705
Get Book Here
Book Description
This book is an introduction to the theory, practice, and implementation of the Lattice Boltzmann (LB) method, a powerful computational fluid dynamics method that is steadily gaining attention due to its simplicity, scalability, extensibility, and simple handling of complex geometries. The book contains chapters on the method's background, fundamental theory, advanced extensions, and implementation. To aid beginners, the most essential paragraphs in each chapter are highlighted, and the introductory chapters on various LB topics are front-loaded with special "in a nutshell" sections that condense the chapter's most important practical results. Together, these sections can be used to quickly get up and running with the method. Exercises are integrated throughout the text, and frequently asked questions about the method are dealt with in a special section at the beginning. In the book itself and through its web page, readers can find example codes showing how the LB method can be implemented efficiently on a variety of hardware platforms, including multi-core processors, clusters, and graphics processing units. Students and scientists learning and using the LB method will appreciate the wealth of clearly presented and structured information in this volume.
