# Multiphysics in Nuclear Science and Engineering

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## Modelling of Nuclear Reactor Multi physics

Author | : Christophe Demazière |

Publsiher | : Academic Press |

Total Pages | : 368 |

Release | : 2019-11-19 |

ISBN 10 | : 012815070X |

ISBN 13 | : 9780128150702 |

Language | : EN, FR, DE, ES & NL |

**Modelling of Nuclear Reactor Multi physics Book Review:**

Modelling of Nuclear Reactor Multiphysics: From Local Balance Equations to Macroscopic Models in Neutronics and Thermal-Hydraulics is an accessible guide to the advanced methods used to model nuclear reactor systems. The book addresses the frontier discipline of neutronic/thermal-hydraulic modelling of nuclear reactor cores, presenting the main techniques in a generic manner and for practical reactor calculations. The modelling of nuclear reactor systems is one of the most challenging tasks in complex system modelling, due to the many different scales and intertwined physical phenomena involved. The nuclear industry as well as the research institutes and universities heavily rely on the use of complex numerical codes. All the commercial codes are based on using different numerical tools for resolving the various physical fields, and to some extent the different scales, whereas the latest research platforms attempt to adopt a more integrated approach in resolving multiple scales and fields of physics. The book presents the main algorithms used in such codes for neutronic and thermal-hydraulic modelling, providing the details of the underlying methods, together with their assumptions and limitations. Because of the rapidly expanding use of coupled calculations for performing safety analyses, the analysists should be equally knowledgeable in all fields (i.e. neutron transport, fluid dynamics, heat transfer). The first chapter introduces the book’s subject matter and explains how to use its digital resources and interactive features. The following chapter derives the governing equations for neutron transport, fluid transport, and heat transfer, so that readers not familiar with any of these fields can comprehend the book without difficulty. The book thereafter examines the peculiarities of nuclear reactor systems and provides an overview of the relevant modelling strategies. Computational methods for neutron transport, first at the cell and assembly levels, then at the core level, and for one-/two-phase flow transport and heat transfer are treated in depth in respective chapters. The coupling between neutron transport solvers and thermal-hydraulic solvers for coarse mesh macroscopic models is given particular attention in a dedicated chapter. The final chapter summarizes the main techniques presented in the book and their interrelation, then explores beyond state-of-the-art modelling techniques relying on more integrated approaches. Covers neutron transport, fluid dynamics, and heat transfer, and their interdependence, in one reference Analyses the emerging area of multi-physics and multi-scale reactor modelling Contains 71 short videos explaining the key concepts and 77 interactive quizzes allowing the readers to test their understanding

## Nuclear Reactor Multiphysics Via Bond Graph Formalism

Author | : Eugeny Sosnovsky,Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |

Publsiher | : Unknown |

Total Pages | : 216 |

Release | : 2014 |

ISBN 10 | : |

ISBN 13 | : OCLC:895647656 |

Language | : EN, FR, DE, ES & NL |

**Nuclear Reactor Multiphysics Via Bond Graph Formalism Book Review:**

This work proposes a simple and effective approach to modeling nuclear reactor multiphysics problems using bond graphs. Conventional multiphysics simulation paradigms normally use operator splitting, which treats the individual physics separately and exchanges the information at every time step. This approach has limited accuracy, and so recently, there has been an increased interest in fully coupled physics simulation. The bond graph formalism has recently been suggested as a potential paradigm for reactor multiphysics simulation; this work develops the tools necessary to utilize bond graphs for practical transient reactor analysis. The bond graph formalism was first introduced to solve the multiphysics problem in electromechanical systems. Over the years, it has been used in many fields including nuclear engineering, but with limited scope due to its perceived impracticality in large systems. Bond graph formalism works by first representing a discretized multiphysics system using a group of graph elements, connected with bonds; the bonds transport conserved quantities, and the elements impose the relations between them. The representation can be automatically converted into a state derivative vector, which can be integrated in time. In an earlier work, the bond graph formalism was first applied to neutron diffusion, and coupled to diffusive heat transfer in a 1D slab reactor. In this work, methods are developed to represent, using bond graphs, 2D and 3D multigroup neutron diffusion with precursors, nonlinear point kinetics, and basic nearly-incompressible 1D flow for fully coupled reactor simulation. High-performance, matrix-based bond graph processing methods were developed to support the simulation of medium- and large-scale problems. A pressurized water reactor point kinetics, single-channel rod ejection benchmark problem was used to verify the nonlinear point kinetics representation. 2D and 3D boiling water reactor control blade drop problems were also successfully simulated with the matrix-based bond graph processing code. The code demonstrated 3rd-order convergence in time, a very desirable property of fully coupled time integrators.

## Multiphysics Modelling of Fluid Particulate Systems

Author | : Hassan Khawaja |

Publsiher | : Academic Press |

Total Pages | : 250 |

Release | : 2020-03 |

ISBN 10 | : 0128183454 |

ISBN 13 | : 9780128183458 |

Language | : EN, FR, DE, ES & NL |

**Multiphysics Modelling of Fluid Particulate Systems Book Review:**

Multiphysics Modelling of Fluid-Particulate Systems provides an explanation of how to model fluid-particulate systems using Eulerian and Lagrangian methods. The computational cost and relative merits of the different methods are compared, with recommendations on where and how to apply them provided. The science underlying the fluid‐particulate phenomena involves computational fluid dynamics (for liquids and gases), computational particle dynamics (solids), and mass and heat transfer. In order to simulate these systems, it is essential to model the interactions between phases and the fluids and particles themselves. This book details instructions for several numerical methods of dealing with this complex problem. This book is essential reading for researchers from all backgrounds interested in multiphase flows or fluid-solid modeling, as well as engineers working on related problems in chemical engineering, food science, process engineering, geophysics or metallurgical processing.

## Issues in Water and Power Engineering 2013 Edition

Author | : Anonim |

Publsiher | : ScholarlyEditions |

Total Pages | : 765 |

Release | : 2013-05-01 |

ISBN 10 | : 1490108327 |

ISBN 13 | : 9781490108322 |

Language | : EN, FR, DE, ES & NL |

**Issues in Water and Power Engineering 2013 Edition Book Review:**

Issues in Water and Power Engineering / 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Fusion Engineering. The editors have built Issues in Water and Power Engineering: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Fusion Engineering in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Water and Power Engineering: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

## Particle Methods for Multi Scale and Multi Physics

Author | : M B Liu,G R Liu |

Publsiher | : World Scientific |

Total Pages | : 400 |

Release | : 2015-12-28 |

ISBN 10 | : 9814571717 |

ISBN 13 | : 9789814571715 |

Language | : EN, FR, DE, ES & NL |

**Particle Methods for Multi Scale and Multi Physics Book Review:**

Multi-scale and multi-physics modeling is useful and important for all areas in engineering and sciences. Particle Methods for Multi-Scale and Multi-Physics systematically addresses some major particle methods for modeling multi-scale and multi-physical problems in engineering and sciences. It contains different particle methods from atomistic scales to continuum scales, with emphasis on molecular dynamics (MD), dissipative particle dynamics (DPD) and smoothed particle hydrodynamics (SPH). This book covers the theoretical background, numerical techniques and many interesting applications of the particle methods discussed in this text, especially in: micro-fluidics and bio-fluidics (e.g., micro drop dynamics, movement and suspension of macro-molecules, cell deformation and migration); environmental and geophysical flows (e.g., saturated and unsaturated flows in porous media and fractures); and free surface flows with possible interacting solid objects (e.g., wave impact, liquid sloshing, water entry and exit, oil spill and boom movement). The presented methodologies, techniques and example applications will benefit students, researchers and professionals in computational engineering and sciences. Contents:IntroductionMolecular DynamicsDissipative Particle Dynamics — MethodologyDissipative Particle Dynamics — ApplicationsSmoothed Particle Hydrodynamics — MethodologySmoothed Particle Hydrodynamics — ApplicationsThree Typical Particle Methods Readership: Undergraduates, graduates, researchers, and professionals studying/dealing with fluid mechanics, numerical analysis and computational mathematics, engineering mechanics, ocean engineering, mechanical engineering. Key Features:The authors have many years of experience in meshfree and particle methods, and are renowned scientists in related areas, with highly cited publications. This can greatly attracts fellow researchers from all around the world to probe the latest development on current major particle methodsThe authors have authored numerous technical publications, and many popular books. They truly understand what the fellow researchers think and wantThe authors have extensive network in academics and research. It is comparatively easy to introduce the book to professional organizations, international conferences, and different academic bodies such as universities and research institutesKeywords:Computer Modeling;Numerical Methods;Meshfree Particle Methods;Smoothed Particle Hydrodynamics;Dissipative Particle Dynamics;Molecular Dynamics

## Nuclear News

Author | : Anonim |

Publsiher | : Unknown |

Total Pages | : 329 |

Release | : 2006 |

ISBN 10 | : |

ISBN 13 | : UCSD:31822035996693 |

Language | : EN, FR, DE, ES & NL |

**Nuclear News Book Review:**

## Nuclear Power Plant Design and Analysis Codes

Author | : Jun Wang,Xin Li,Chris Allison,Judy Hohorst |

Publsiher | : Woodhead Publishing |

Total Pages | : 608 |

Release | : 2020-11-10 |

ISBN 10 | : 0128181915 |

ISBN 13 | : 9780128181911 |

Language | : EN, FR, DE, ES & NL |

**Nuclear Power Plant Design and Analysis Codes Book Review:**

Nuclear Power Plant Design and Analysis Codes: Development, Validation, and Application presents the latest research on the most widely used nuclear codes and the wealth of successful accomplishments which have been achieved over the past decades by experts in the field. Editors Wang, Li,Allison, and Hohorst and their team of authors provide readers with a comprehensive understanding of nuclear code development and how to apply it to their work and research to make their energy production more flexible, economical, reliable and safe. Written in an accessible and practical way, each chapter considers strengths and limitations, data availability needs, verification and validation methodologies and quality assurance guidelines to develop thorough and robust models and simulation tools both inside and outside a nuclear setting. This book benefits those working in nuclear reactor physics and thermal-hydraulics, as well as those involved in nuclear reactor licensing. It also provides early career researchers with a solid understanding of fundamental knowledge of mainstream nuclear modelling codes, as well as the more experienced engineers seeking advanced information on the best solutions to suit their needs. Captures important research conducted over last few decades by experts and allows new researchers and professionals to learn from the work of their predecessors Presents the most recent updates and developments, including the capabilities, limitations, and future development needs of all codes Incudes applications for each code to ensure readers have complete knowledge to apply to their own setting.

## Multiphysics and Multiscale Modeling

Author | : Young W. Kwon |

Publsiher | : CRC Press |

Total Pages | : 425 |

Release | : 2015-10-05 |

ISBN 10 | : 1498782523 |

ISBN 13 | : 9781498782524 |

Language | : EN, FR, DE, ES & NL |

**Multiphysics and Multiscale Modeling Book Review:**

Written to appeal to a wide field of engineers and scientists who work on multiscale and multiphysics analysis, Multiphysics and Multiscale Modeling: Techniques and Applications is dedicated to the many computational techniques and methods used to develop man-made systems as well as understand living systems that exist in nature. Presenting a body

## Computational Fluid Dynamics

Author | : Adela Ionescu |

Publsiher | : BoD – Books on Demand |

Total Pages | : 410 |

Release | : 2018-02-14 |

ISBN 10 | : 9535137905 |

ISBN 13 | : 9789535137900 |

Language | : EN, FR, DE, ES & NL |

**Computational Fluid Dynamics Book Review:**

This book is the result of a careful selection of contributors in the field of CFD. It is divided into three sections according to the purpose and approaches used in the development of the contributions. The first section describes the "high-performance computing" (HPC) tools and their impact on CFD modeling. The second section is dedicated to "CFD models for local and large-scale industrial phenomena." Two types of approaches are basically contained here: one concerns the adaptation from global to local scale, - e.g., the applications of CFD to study the climate changes and the adaptations to local scale. The second approach, very challenging, is the multiscale analysis. The third section is devoted to "CFD in numerical modeling approach for experimental cases." Its chapters emphasize on the numerical approach of the mathematical models associated to few experimental (industrial) cases. Here, the impact and the importance of the mathematical modeling in CFD are focused on. It is expected that the collection of these chapters will enrich the state of the art in the CFD domain and its applications in a lot of fields. This collection proves that CFD is a highly interdisciplinary research area, which lies at the interface of physics, engineering, applied mathematics, and computer science.

## Fusion Neutronics

Author | : Yican Wu |

Publsiher | : Springer |

Total Pages | : 393 |

Release | : 2017-08-16 |

ISBN 10 | : 981105469X |

ISBN 13 | : 9789811054693 |

Language | : EN, FR, DE, ES & NL |

**Fusion Neutronics Book Review:**

This book provides a systematic and comprehensive introduction to fusion neutronics, covering all key topics from the fundamental theories and methodologies, as well as a wide range of fusion system designs and experiments. It is the first-ever book focusing on the subject of fusion neutronics research. Compared with other nuclear devices such as fission reactors and accelerators, fusion systems are normally characterized by their complex geometry and nuclear physics, which entail new challenges for neutronics such as complicated modeling, deep penetration, low simulation efficiency, multi-physics coupling, etc. The book focuses on the neutronic characteristics of fusion systems and introduces a series of theories and methodologies that were developed to address the challenges of fusion neutronics. Further, it introduces readers to the unique principles and procedures of neutronics design, experimental methodologies and methodologies for fusion systems. The book not only highlights the latest advances and trends in the field, but also draws on the experiences and skills collected in the author’s more than 40 years of research. To make it more accessible and enhance its practical value, various representative examples are included to illustrate the application and efficiency of the methods, designs and experimental techniques discussed.

## NUCLEAR REACTOR THERMAL HYDRAU

Author | : Pradip Saha |

Publsiher | : American Society of Mechanical Engineers |

Total Pages | : 160 |

Release | : 2017-01-23 |

ISBN 10 | : 9780791861288 |

ISBN 13 | : 0791861287 |

Language | : EN, FR, DE, ES & NL |

**NUCLEAR REACTOR THERMAL HYDRAU Book Review:**

This series provides current and future engineers, researchers, technicians and other professionals and practitioners with practical, concise but key information concerning nuclear technologies.

## Multiphysics Simulation by Design for Electrical Machines Power Electronics and Drives

Author | : Dr. Marius Rosu,Dr. Ping Zhou,Dr. Dingsheng Lin,Dr. Dan M. Ionel,Dr. Mircea Popescu,Frede Blaabjerg,Dr. Vandana Rallabandi,Dr. David Staton |

Publsiher | : John Wiley & Sons |

Total Pages | : 320 |

Release | : 2017-11-20 |

ISBN 10 | : 1119103487 |

ISBN 13 | : 9781119103486 |

Language | : EN, FR, DE, ES & NL |

**Multiphysics Simulation by Design for Electrical Machines Power Electronics and Drives Book Review:**

Presents applied theory and advanced simulation techniques for electric machines and drives This book combines the knowledge of experts from both academia and the software industry to present theories of multiphysics simulation by design for electrical machines, power electronics, and drives. The comprehensive design approach described within supports new applications required by technologies sustaining high drive efficiency. The highlighted framework considers the electric machine at the heart of the entire electric drive. The book also emphasizes the simulation by design concept—a concept that frames the entire highlighted design methodology, which is described and illustrated by various advanced simulation technologies. Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives begins with the basics of electrical machine design and manufacturing tolerances. It also discusses fundamental aspects of the state of the art design process and includes examples from industrial practice. It explains FEM-based analysis techniques for electrical machine design—providing details on how it can be employed in ANSYS Maxwell software. In addition, the book covers advanced magnetic material modeling capabilities employed in numerical computation; thermal analysis; automated optimization for electric machines; and power electronics and drive systems. This valuable resource: Delivers the multi-physics know-how based on practical electric machine design methodologies Provides an extensive overview of electric machine design optimization and its integration with power electronics and drives Incorporates case studies from industrial practice and research and development projects Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives is an incredibly helpful book for design engineers, application and system engineers, and technical professionals. It will also benefit graduate engineering students with a strong interest in electric machines and drives.

## Soft Errors

Author | : Jean-Luc Autran,Daniela Munteanu |

Publsiher | : CRC Press |

Total Pages | : 439 |

Release | : 2017-12-19 |

ISBN 10 | : 1351831550 |

ISBN 13 | : 9781351831550 |

Language | : EN, FR, DE, ES & NL |

**Soft Errors Book Review:**

Soft errors are a multifaceted issue at the crossroads of applied physics and engineering sciences. Soft errors are by nature multiscale and multiphysics problems that combine not only nuclear and semiconductor physics, material sciences, circuit design, and chip architecture and operation, but also cosmic-ray physics, natural radioactivity issues, particle detection, and related instrumentation. Soft Errors: From Particles to Circuits addresses the problem of soft errors in digital integrated circuits subjected to the terrestrial natural radiation environment—one of the most important primary limits for modern digital electronic reliability. Covering the fundamentals of soft errors as well as engineering considerations and technological aspects, this robust text: Discusses the basics of the natural radiation environment, particle interactions with matter, and soft-error mechanisms Details instrumentation developments in the fields of environment characterization, particle detection, and real-time and accelerated tests Describes the latest computational developments, modeling, and simulation strategies for the soft error-rate estimation in digital circuits Explores trends for future technological nodes and emerging devices Soft Errors: From Particles to Circuits presents the state of the art of this complex subject, providing comprehensive knowledge of the complete chain of the physics of soft errors. The book makes an ideal text for introductory graduate-level courses, offers academic researchers a specialized overview, and serves as a practical guide for semiconductor industry engineers or application engineers.

## Nuclear Reactor Physics and Engineering

Author | : John C. Lee |

Publsiher | : John Wiley & Sons |

Total Pages | : 656 |

Release | : 2020-03-17 |

ISBN 10 | : 1119582326 |

ISBN 13 | : 9781119582328 |

Language | : EN, FR, DE, ES & NL |

**Nuclear Reactor Physics and Engineering Book Review:**

An introductory text for broad areas of nuclear reactor physics Nuclear Reactor Physics and Engineering offers information on analysis, design, control, and operation of nuclear reactors. The author—a noted expert on the topic—explores the fundamentals and presents the mathematical formulations that are grounded in differential equations and linear algebra. The book puts the focus on the use of neutron diffusion theory for the development of techniques for lattice physics and global reactor system analysis. The author also includes recent developments in numerical algorithms, including the Krylov subspace method, and the MATLAB software, including the Simulink toolbox, for efficient studies of steady-state and transient reactor configurations. In addition, nuclear fuel cycle and associated economics analysis are presented, together with the application of modern control theory to reactor operation. This important book: Provides a comprehensive introduction to the fundamental concepts of nuclear reactor physics and engineering Contains information on nuclear reactor kinetics and reactor design analysis Presents illustrative examples to enhance understanding Offers self-contained derivation of ﬂuid conservation equations Written for undergraduate and graduate students in nuclear engineering and practicing engineers, Nuclear Reactor Physics and Engineering covers the fundamental concepts and tools of nuclear reactor physics and analysis.

## Structural Alloys for Nuclear Energy Applications

Author | : Robert Odette,Steven Zinkle |

Publsiher | : Newnes |

Total Pages | : 673 |

Release | : 2019-08-15 |

ISBN 10 | : 012397349X |

ISBN 13 | : 9780123973498 |

Language | : EN, FR, DE, ES & NL |

**Structural Alloys for Nuclear Energy Applications Book Review:**

High-performance alloys that can withstand operation in hazardous nuclear environments are critical to presentday in-service reactor support and maintenance and are foundational for reactor concepts of the future. With commercial nuclear energy vendors and operators facing the retirement of staff during the coming decades, much of the scholarly knowledge of nuclear materials pursuant to appropriate, impactful, and safe usage is at risk. Led by the multi-award winning editorial team of G. Robert Odette (UCSB) and Steven J. Zinkle (UTK/ORNL) and with contributions from leaders of each alloy discipline, Structural Alloys for Nuclear Energy Applications aids the next generation of researchers and industry staff developing and maintaining steels, nickel-base alloys, zirconium alloys, and other structural alloys in nuclear energy applications. This authoritative reference is a critical acquisition for institutions and individuals seeking state-of-the-art knowledge aided by the editors’ unique personal insight from decades of frontline research, engineering and management. Focuses on in-service irradiation, thermal, mechanical, and chemical performance capabilities. Covers the use of steels and other structural alloys in current fission technology, leading edge Generation-IV fission reactors, and future fusion power reactors. Provides a critical and comprehensive review of the state-of-the-art experimental knowledge base of reactor materials, for applications ranging from engineering safety and lifetime assessments to supporting the development of advanced computational models.

## Multiphysics Simulations in Automotive and Aerospace Applications

Author | : Mojtaba Moatamedi,Thurai Rahulan,Hassan Khawaja |

Publsiher | : Academic Press |

Total Pages | : 270 |

Release | : 2021-07-01 |

ISBN 10 | : 0128179007 |

ISBN 13 | : 9780128179000 |

Language | : EN, FR, DE, ES & NL |

**Multiphysics Simulations in Automotive and Aerospace Applications Book Review:**

Multiphysics Simulations in Automotive and Aerospace Applications provides the fundamentals and latest developments on numerical methods for solving multiphysics problems including fluid-solid interaction, fluid-structure‐thermal coupling, electromagnetic-fluid-solid coupling, vibro and aeroacoustics. Chapters describe the different algorithms and numerical methods used for solving coupled problems using implicit or explicit coupling problems from industrial or academic applications. Given the book’s comprehensive coverage, automotive and aerospace engineers, designers, graduate students and researchers involved in the simulation of practical coupling problems will find the mathematical and numerical description of the coupling algorithms they are modelling in this new volume of the Multiphysics: Advances and Applications series. Provides the fundamentals of the numerical methods and comprehensive examples for solving coupled problems Features multi-physics methods and available codes as well as what these codes can do Presents examples from industrial and academic applications

## Numerical Modeling of Coupled Phenomena in Science and Engineering

Author | : Mario César Suárez Arriaga,Jochen Bundschuh,Francisco Javier Dominguez-Mota |

Publsiher | : CRC Press |

Total Pages | : 496 |

Release | : 2008-12-01 |

ISBN 10 | : 0203886224 |

ISBN 13 | : 9780203886229 |

Language | : EN, FR, DE, ES & NL |

**Numerical Modeling of Coupled Phenomena in Science and Engineering Book Review:**

Mathematics is a universal language. Differential equations, mathematical modeling, numerical methods and computation form the underlying infrastructure of engineering and the sciences. In this context mathematical modeling is a very powerful tool for studying engineering problems, natural systems and human society. This interdisciplinary book cont

## Multi physics Approach to the Modelling and Analysis of Molten Salt Reactors

Author | : Lelio Luzzi,Valentino Di Marcello,Antonio Cammi |

Publsiher | : Nova Novinka |

Total Pages | : 140 |

Release | : 2012 |

ISBN 10 | : 9781614700005 |

ISBN 13 | : 1614700001 |

Language | : EN, FR, DE, ES & NL |

**Multi physics Approach to the Modelling and Analysis of Molten Salt Reactors Book Review:**

Multi-Physics Modelling (MPM) is an innovative simulation technique that looks very promising for the employment in the field of nuclear engineering as an integrative analysis support in the design development of current and innovative nuclear reactors. This book presents a Multi-Physics Modelling (MPM) approach to the analysis of nuclear reactor core behaviour, developed to study the coupling between neutronics and thermo-hydrodynamics. Reference is made to the Molten Salt Reactor, one of the innovative nuclear systems under development in the framework of the Generation IV International Forum, but the same methodology can be applied to other reactor systems.

## Tally Derivative Based Surrogate Models for Faster Monte Carlo Multiphysics

Author | : Sterling M. Harper |

Publsiher | : Unknown |

Total Pages | : 231 |

Release | : 2020 |

ISBN 10 | : |

ISBN 13 | : OCLC:1227100602 |

Language | : EN, FR, DE, ES & NL |

**Tally Derivative Based Surrogate Models for Faster Monte Carlo Multiphysics Book Review:**

Existing neutron transport methods used in the nuclear power industry rely on a complex toolchain of modeling and simulation software. Each link in this chain applies various approximations to the spatial, angular, and energy distributions of the problem variables; and these approximations can limit solver predictive capabilities. Monte Carlo (MC) neutron transport is a high-fidelity method that can relax many of these approximations and possibly replace much of the existing toolchain. However, MC neutron transport is also very slow, particularly when coupled into a multiphysics solver. Some researchers have published runtime costs of over 100 000 cpuhours to converge a quarter-core multiphysics problem with MC -- an expense which makes MC-based tools prohibitive for regular use. In response to this issue, some researchers have developed acceleration techniques using the diffusion-based CMFD (coarse mesh finite difference) method. This thesis extends that work by coupling the CMFD solver directly to the thermalhydraulics solvers in a multiphysics simulation. To enable this coupling, MC differential tallies are used to compute the feedback dependence of CMFD parameters. Novel methods based on the windowed multipole cross section representation are used to compute fuel temperature derivatives along with coolant density derivatives. This differential tally approach proves to be flexible; the same procedure is applied to each coarse mesh cell regardless of the presence of control rods, burnable poisons, spacer grids, 135Xe, or other details of the MC model. With the inclusion of a simple pin power reconstruction scheme, these methods create a surrogate neutronics solver capable of bi-directional coupling with thermal-hydraulics. This surrogate can then accelerate multiphysics convergence by reducing the reliance on costly MC simulations. Furthermore, a novel source-weight clipping procedure is introduced to damp MCCMFD instabilities. Because this clipping procedure does not require multiple MC generations, CMFD and multiphysics coupling can be performed after each MC generation -- even the first generation. This allows simulations to be run with very few MC generations, a feature which alleviates the cost of using many neutrons per MC generation to reduce the impact of fission source distribution undersampling. This methodology is tested on a quarter-core model of the BEAVRS benchmark, a large pressurized water reactor. Simplified subchannel fluid dynamics, fuel pin heat transfer, and equilibrium xenon solvers are included to form a multiphysics system. Without the presented acceleration methods, these quarter-core multiphysics simulations using 200 million neutrons per generation are projected to require 3 300 cpu core-hours to reach stationarity. With the presented methods, this cost falls to 270 core-hours. Further results are shown to demonstrate the runtime costs needed to tightly resolve fine-mesh power distributions with projected runtime savings of 6× over prior work.

## Tokamak Engineering Mechanics

Author | : Yuntao Song,Weiyue Wu,Shijun Du |

Publsiher | : Springer Science & Business Media |

Total Pages | : 241 |

Release | : 2013-09-20 |

ISBN 10 | : 3642395759 |

ISBN 13 | : 9783642395758 |

Language | : EN, FR, DE, ES & NL |

**Tokamak Engineering Mechanics Book Review:**

Tokamak Engineering Mechanics offers concise and thorough coverage of engineering mechanics theory and application for tokamaks, and the material is reinforced by numerous examples. Chapter topics include general principles, static mechanics, dynamic mechanics, thermal fluid mechanics and multiphysics structural mechanics of tokamak structure analysis. The theoretical principle of the design and the methods of the analysis for various components and load conditions are presented, while the latest engineering technologies are also introduced. The book will provide readers involved in the study of mechanical/fusion engineering with a general understanding of tokamak engineering mechanics. Yuntao Song is Head of the Tokamak Design Division at the Institute of Plasma Physics, Chinese Academic of Science (ASIPP), China.