Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
A New Flux Limited Diffusion Method For Neutral Particle Transport Calculations
Download A New Flux Limited Diffusion Method For Neutral Particle Transport Calculations full books in PDF, epub, and Kindle. Read online A New Flux Limited Diffusion Method For Neutral Particle Transport Calculations ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis A New Flux-limited Diffusion Method for Neutral Particle Transport Calculations by :
Download or read book A New Flux-limited Diffusion Method for Neutral Particle Transport Calculations written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Boltzmann equation, which is often used to describe neutral particle transport process, is impossible to solve analytically in most cases. Solving the equation by a numerically method could also be very time-consuming for some problems. Therefore, various approximation methods have been developed for particle transport calculations. In this dissertation, a new Flux-Limited diffusion method (DM) is investigated as a low-order approximation to the transport equation. Specifically, the new Flux-Limited diffusion method (DM) is derived based on the Minerbo maximum entropy Eddington factor and corresponding boundary conditions are developed. Performance of the DM method is tested for a variety of particle transport problems: including steady-state problems, transient problems, one-dimensional problems, two-dimensional problems, flux distribution problems, eigen-value problems, one-group problems, and two-group problems. The tests demonstrate that compared with other approximations, the DM method has the following good features. (1) The DM method is a low order approximation as the classic diffusion method but can improve the accuracy of classic diffusion method by a factor up to 10. (2) The DM method has relatively fast computing speed compared with other high order approximations and its computation cost is not too expensive compared with the classic diffusion method. (3) The DM method can predict proper traveling speed of particles in time-dependent problems. (4) The DM method is valid for neutral particle transport in systems containing strong absorbers, regions near particle sources or boundaries, and systems where strongly anisotropic scattering of particles occur. (5) The DM method is superior to other Flux-Limited diffusion methods available in the literature. (6) The solutions of the DM method are numerically stable in all the circumstances. Overall, the DM method is promising as a low-order approximation for particle transport calculations in some applications.
Book Synopsis Recently Developed Methods in Neutral-particle Transport Calculations by :
Download or read book Recently Developed Methods in Neutral-particle Transport Calculations written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It has become increasingly apparent that successful, general methods for the solution of the neutral particle transport equation involve a close connection between the spatial-discretization method used and the source-acceleration method chosen. The first form of the transport equation, angular discretization which is discrete ordinates is considered as well as spatial discretization based upon a mesh arrangement. Characteristic methods are considered briefly in the context of future, desirable developments. The ideal spatial-discretization method is described as having the following attributes: (1) positive-positive boundary data yields a positive angular flux within the mesh including its boundaries; (2) satisfies the particle balance equation over the mesh, that is, the method is conservative; (3) possesses the diffusion limit independent of spatial mesh size, that is, for a linearly isotropic flux assumption, the transport differencing reduces to a suitable diffusion equation differencing; (4) the method is unconditionally acceleratable, i.e., for each mesh size, the method is unconditionally convergent with a source iteration acceleration. It is doubtful that a single method possesses all these attributes for a general problem. Some commonly used methods are outlined and their computational performance and usefulness are compared; recommendations for future development are detailed, which include practical computational considerations.
Book Synopsis An Automated Variance Reduction Method for Global Monte Carlo Neutral Particle Transport Problems by : Marc. A. Cooper
Download or read book An Automated Variance Reduction Method for Global Monte Carlo Neutral Particle Transport Problems written by Marc. A. Cooper and published by . This book was released on 1999 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Methods for Particle Transport by : Ron Tunstall Ackroyd
Download or read book Finite Element Methods for Particle Transport written by Ron Tunstall Ackroyd and published by Taylor & Francis Group. This book was released on 1997 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on the transport of neutral particles, neutrons and photons, using the finite element method to address practical problems in nuclear power and mineral prospecting. Includes discussions of how the method began and has matured to become a practical tool complementing the stochastic Monte Carlo method, spatial finite elements, examples of calculations, equivalent forms of the Boltzmann equation, neutron streaming in voids, some aspects of discontinuous variational solutions, complementary principles and benchmarking, time-dependent transport, and modelling three-dimensional systems. Double spaced. Annotation copyright by Book News, Inc., Portland, OR
Book Synopsis Chapman--Enskog Approach to Flux-limited Diffusion Theory by :
Download or read book Chapman--Enskog Approach to Flux-limited Diffusion Theory written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the technique developed by Chapman and Enskog for deriving the Navier--Stokes equations from the Boltzmann equation, a framework is set up for deriving diffusion theories from the transport equation. The procedure is first applied to give a derivation of isotropic diffusion theory and then of a completely new theory which is naturally flux-limited. This new flux-limited diffusion theory is then compared with asymptotic diffusion theory.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutral Particle Integral Transport in Inertial Confinement of Fusion Systems Using Time Dependent Integral Transport Methods by : K. R. Olson
Download or read book Neutral Particle Integral Transport in Inertial Confinement of Fusion Systems Using Time Dependent Integral Transport Methods written by K. R. Olson and published by . This book was released on 1999 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Nuclear Engineering by : Dan Gabriel Cacuci
Download or read book Handbook of Nuclear Engineering written by Dan Gabriel Cacuci and published by Springer Science & Business Media. This book was released on 2010-09-14 with total page 3701 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an authoritative compilation of information regarding methods and data used in all phases of nuclear engineering. Addressing nuclear engineers and scientists at all levels, this book provides a condensed reference on nuclear engineering since 1958.
Book Synopsis Nuclear Fusion by Inertial Confinement by : Guillermo Velarde
Download or read book Nuclear Fusion by Inertial Confinement written by Guillermo Velarde and published by CRC Press. This book was released on 2020-11-25 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Fusion by Inertial Confinement provides a comprehensive analysis of directly driven inertial confinement fusion. All important aspects of the process are covered, including scientific considerations that support the concept, lasers and particle beams as drivers, target fabrication, analytical and numerical calculations, and materials and engineering considerations. Authors from Australia, Germany, Italy, Japan, Russia, Spain, and the U.S. have contributed to the volume, making it an internationally significant work for all scientists working in the Inertial Confinement Fusion (ICF) field, as well as for graduate students in engineering and physics with interest in ICF.
Book Synopsis Fidèle relation de l'accouchement, maladie et ouverture du corps de Madame by :
Download or read book Fidèle relation de l'accouchement, maladie et ouverture du corps de Madame written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Space-time Flux Synthesis Methods for the Approximate Solution of Time-dependent Boltzmann Neutron Transport Equation by : V. Luco
Download or read book Space-time Flux Synthesis Methods for the Approximate Solution of Time-dependent Boltzmann Neutron Transport Equation written by V. Luco and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Use of Diffusion Synthetic Acceleration in Parallel 3D Neutral Particle Transport Calculations by :
Download or read book On the Use of Diffusion Synthetic Acceleration in Parallel 3D Neutral Particle Transport Calculations written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The linear Boltzmann transport equation (BTE) is an integro-differential equation arising in deterministic models of neutral and charged particle transport. In slab (one-dimensional Cartesian) geometry and certain higher-dimensional cases, Diffusion Synthetic Acceleration (DSA) is known to be an effective algorithm for the iterative solution of the discretized BTE. Fourier and asymptotic analyses have been applied to various idealizations (e.g., problems on infinite domains with constant coefficients) to obtain sharp bounds on the convergence rate of DSA in such cases. While DSA has been shown to be a highly effective acceleration (or preconditioning) technique in one-dimensional problems, it has been observed to be less effective in higher dimensions. This is due in part to the expense of solving the related diffusion linear system. We investigate here the effectiveness of a parallel semicoarsening multigrid (SMG) solution approach to DSA preconditioning in several three dimensional problems. In particular, we consider the algorithmic and implementation scalability of a parallel SMG-DSA preconditioner on several types of test problems.
Book Synopsis Flux-limited Diffusion Theory for Spatially Discretized Equations by : Bertrand Laubsch
Download or read book Flux-limited Diffusion Theory for Spatially Discretized Equations written by Bertrand Laubsch and published by . This book was released on 2000 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatially discretized diffusion approximation equations are derived directly from spatially discretized radiation transport equations in 1-D slab geometry. Derivations for isotropic diffusion theory (IDT) and Levermore-Pomraning's flux-limited diffusion theory (FLDT) are applied to lumped linear discontinuous (LLD) transport equations. We find that the (energy density) solution is continuous across the edge for EDT. For FLDT, we find that the intensity may he discontinuous across a cell edge; this doubles the number of points that traditionally need to be solved for in a diffusion approximation. The FLDT derivation produces unique discretized flux-limited diffusion equations. We produced a numerical scheme for these FLDT equations that includes a new iteration on the flux-limiting parameter and a local iteration on the edge discontinuities. Numerical results indicate that this approach is an improvement over standard numerical FLDT discretization schemes.
Book Synopsis Generalized View Factor Techniques for Treating Streaming and Scattering in Neutral-particle Transport by :
Download or read book Generalized View Factor Techniques for Treating Streaming and Scattering in Neutral-particle Transport written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: View factor techniques, and their generalization to time dependent static geometries, for treating neutral particle transport involving free streaming in enclosures are described. An approximation of the standard view factor technique which uses retarded times to treat time-dependent, fixed-geometry, 3-D vacuum enclosures is described. Procedures for the numerical determination of the view factors and the transport calculations themselves are described. The advantages and disadvantages of this technique are discussed. The limitations give rise to a new generalized view factor approach which is discussed in detail. In this technique a functional expansion is made of the unknown emission densities on the surface of the enclosure. The coefficients in the expansion contain the time dependence, if any, of the emission, and the expansion functions describe the areal dependence of the emission. These coefficients enter into a series of coupled linear integral equations which contain quantities that are generalizations of the view factors and depend only on the geometry of the enclosure and the distribution of scattering material contained therein. Monte Carlo techniques are used to estimate the generalized view factors which are then adjusted slightly using the method of maximum likelihood and least squares minimization to satisfy appropriate thermodynamic consistency conditions. After the imposition of suitable initial and boundary conditions, the integral equations involving the expansion coefficients are solved.
Author :Astronomisches Recheninstitut Publisher :Springer Science & Business Media ISBN 13 :3662123797 Total Pages :1456 pages Book Rating :4.6/5 (621 download)
Book Synopsis Literature 1992, Part 1 by : Astronomisches Recheninstitut
Download or read book Literature 1992, Part 1 written by Astronomisches Recheninstitut and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1456 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Astronomy and Astrophysics Abstracts" appearing twice a year has become oneof the fundamental publications in the fields of astronomy, astrophysics andneighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world.
Download or read book INIS Atomindeks written by and published by . This book was released on 1987 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Methods For Two-phase Flow And Particle Transport (With Cd-rom) by : Wen Ho Lee
Download or read book Computational Methods For Two-phase Flow And Particle Transport (With Cd-rom) written by Wen Ho Lee and published by World Scientific Publishing Company. This book was released on 2013-03-22 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes mathematical formulations and computational methods for solving two-phase flow problems with a computer code that calculates thermal hydraulic problems related to light water and fast breeder reactors. The physical model also handles the particle and gas flow problems that arise from coal gasification and fluidized beds. The second part of this book deals with the computational methods for particle transport.
