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Author : A. D. Basanth Roy
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (89 download)
Download or read book Validation and Testing of the Adaptive Mesh Refinement Spray Models written by A. D. Basanth Roy and published by . This book was released on 2001 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sara Dailey Bauman
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Spray Model for an Adaptive Mesh Refinement Code written by Sara Dailey Bauman and published by . This book was released on 2001 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tomasz Plewa
Publisher : Springer Science & Business Media
ISBN 13 : 3540270396
Total Pages : 550 pages
Book Rating : 4.5/5 (42 download)
Download or read book Adaptive Mesh Refinement - Theory and Applications written by Tomasz Plewa and published by Springer Science & Business Media. This book was released on 2005-12-20 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced numerical simulations that use adaptive mesh refinement (AMR) methods have now become routine in engineering and science. Originally developed for computational fluid dynamics applications these methods have propagated to fields as diverse as astrophysics, climate modeling, combustion, biophysics and many others. The underlying physical models and equations used in these disciplines are rather different, yet algorithmic and implementation issues facing practitioners are often remarkably similar. Unfortunately, there has been little effort to review the advances and outstanding issues of adaptive mesh refinement methods across such a variety of fields. This book attempts to bridge this gap. The book presents a collection of papers by experts in the field of AMR who analyze past advances in the field and evaluate the current state of adaptive mesh refinement methods in scientific computing.
Author : Amol Kulkarni
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Sub-grid Droplet Source Model for High Speed Sprays Using Large Eddy Simulation written by Amol Kulkarni and published by . This book was released on 2003 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sujata Prakash
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Adaptive Mesh Refinement for Finite Element Flow Modeling in Complex Geometries written by Sujata Prakash and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive mesh refinement is a powerful tool for obtaining the highest solution accuracy for a given computational effort. Over the past decade, many adaptive techniques have been developed and applied to a variety of fluid flow problems. Results obtained for compressible flows, and to an extent, 2D incompressible flows have been impressive, however, similar progress has not been noted for 3D incompressible flows, particularly in complicated geometries. The objective of this thesis was to develop and test an adaptive solution methodology for 3D incompressible flow simulations in domains of arbitrary complexity. To characterize the finite element solution error, the Zienkiewicz-Zhu patch recovery error estimator (LPR) was adopted. An enhanced version of the LPR error estimator was formulated and implemented using 10-noded tetrahedral elements. The enhanced estimator (LPRC) resulted in significantly improved gradient recovery (and consequently, improved error estimates) at virtually no additional computational cost. For mesh refinement, an elemental subdivision procedure was implemented. To enable refinement in complex geometries, a procedure for preserving the boundary integrity of a refined mesh was developed. This methodology can be used for geometric data from any solid modeling (CAD) system provided the data can be exported in the IGES format. A benchmark study of the AMR procedure, in which steady flow over a three-dimensional backward-facing step was simulated, showed that the cumulative computational effort required in the adaptive analysis was lower than that required in a non-adaptive analysis of the same problem. In the second phase of this work, the AMR procedure was applied to modeling flow through two arterial geometries. Specifically, flows in an idealized end-to-side anastomosis and in a human right coronary artery were examined. Both studies assessed whether an AMR analysis could achieve more accurate solutions than conventional analyses that utilize high-resolution meshes whose gradation is based on 'a priori' knowledge of the flow field. It was noted that mesh-independent velocity fields were not very difficult to obtain even in the absence of an adaptive methodology. However, wall shear stress fields were much more difficult to absolutely resolve non-adaptively. Given that shear stresses occurring on arterial walls are widely believed to be a key factor governing the development of arterial disease, it is very important to accurately resolve wall shear stress fields if confidence can be placed in the results of numerical simulations of arterial flow phenomena. These results indicate that wall shear stress is an extremely sensitive measure of spatial resolution, and that the systematic solution-adaptive methodology developed in this thesis is very effective in producing accurately resolved wall shear stress fields.
Download or read book Adaptive Mesh Refinement for Finite Element Flow Modeling in Complex Geometries written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shawn Shamendra Prasad
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Parallel, Block-based, Adaptive Mesh Refinement, Finite-volume Scheme for Solution of Three-dimensional Favre-averaged Navier-Stokes Equations written by Shawn Shamendra Prasad and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 994 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrew James Mayfield
Publisher :
ISBN 13 :
Total Pages : 552 pages
Book Rating : 4.:/5 (494 download)
Download or read book Adaptive Mesh Refinement written by Andrew James Mayfield and published by . This book was released on 1993 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Begovic
Publisher : IOS Press
ISBN 13 : 1643681257
Total Pages : 294 pages
Book Rating : 4.6/5 (436 download)
Download or read book HSMV 2020 written by E. Begovic and published by IOS Press. This book was released on 2020-11-03 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the 12th International Symposium on High Speed Marine Vehicles, held virtually as an e-conference for the first time on 15 and 16 October 2020. High Speed Marine Vehicles Conference has almost 30-year history since the first Conference held in Naples in 1991. Since then, it has been an opportunity to present and discuss developments in the design, construction and operation of High Speed Marine Vessels. More than 40 abstracts were submitted for this edition of the conference, and following a rigorous review process, 26 papers were selected for inclusion in this book. These have been divided into 7 sections: CFD/EFD/sea trials; hydrofoils; multi-hull hydrodynamics; planing-hull hydrodynamics; propulsion and ship machinery; second generation intact stability criteria; and structures, loads, strength and materials. Topics covered include updated aspects of and developments in ship design, numerical and experimental hydrodynamics, seakeeping and maneuvering, and marine structures and machinery. This publication will be of interest to researchers from academia, industry, government agencies and certifying authorities, as well as designers and operators of high-speed vessels.
Author : Abhishek Trivedi
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (753 download)
Download or read book An Adaptive Mesh Refinement Technique for Dynamics of Solids written by Abhishek Trivedi and published by . This book was released on 2007 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation of dynamics problems generally is heavily dependent on mesh size for convergence and accuracy. In many cases, the requirement of mesh size reaches to such proportions that the problem becomes unsolvable for the available computational resources. We perceive that such problems can be solved by refining and unrefining mesh adaptively during time stepping. Adaptive mesh refinement techniques available in popular literature are marred by various limitations, such as element-specific techniques, algorithm-specific techniques, etc. We utilize Conforming Hierarchical Refinement Methods (CHARMS) [32] for our purpose since it relies on the refinement of finite element basis instead of geometric sub-division of elements. Refinement in this fashion produces conforming meshes during adaptive mesh refinement for a wide range of elements. We improve CHARMS to incorporate time stepping problems. In order to show the effectiveness of such an algorithm, we modify an explicit Newmark solver to incorporate it within the adaptive mesh refinement framework. We perform the analysis of conservation properties of the modified algorithm to understand its limitations. Later, we demonstrate application of such development with a very practical example, simulation of an NDE experiment using ultrasonic guided waves. Details presented in [76] has shown that such a simulation would otherwise not have been possible. We further study the guided wave experiment and optimize various parameters of the algorithm to validate experimental results.
Author : Martin Juhas
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Adaptive Mesh Refinement Based on a Posteriori Error Estimation written by Martin Juhas and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Maria Kaltsouni
Publisher :
ISBN 13 :
Total Pages : 390 pages
Book Rating : 4.:/5 (247 download)
Download or read book Adaptive Mesh Refinement for Meshes with Singular Elements written by Maria Kaltsouni and published by . This book was released on 1990 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yuhao Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Download or read book Conforming to Interface Structured Adaptive Mesh Refinement Technique for Modeling Moving Boundary Problems written by Yuhao Chen and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis introduces a new computational framework relying on a non-iterative mesh generation algorithm for modeling moving boundary transient diffusion problems. In particular, we focus on simulating the activation-diffusion-controlled pitting corrosion phenomenon, which is a specific class of such problems. In order to locally adapt the FE mesh to the evolving domain morphology, we employ the Conforming to Interface Structured Adaptive Mesh Refinement (CISAMR) technique. CISAMR combines customized versions of the h-adaptivity, r-adaptivity, and sub-triangulation algorithms to transform a structured grid into a conforming mesh. One of the key advantages of this technique for modeling problems with evolving geometries is that only the elements located along the moving boundary must be modified to regenerate a conforming mesh at each time step. This feature not only facilitates the remeshing process but also reduces the error associated with projecting the solution to the nodes of the new mesh. A detailed discussion is provided on different aspect of the CISAMR implementation for modeling moving boundary problems, including the nodal projection procedure and evaluating the moving interface velocity. After presenting a detailed convergence study, we verify the accuracy of this method for modeling pitting corrosion problems by comparing results with analytical solutions and phase field simulations. Additional example problems are also presented to demonstrate the application of CISAMR for simulating corrosion problems with intricate morphologies.
Author : Oscar Luis Antepara Zambrano
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (112 download)
Download or read book Adaptive Mesh Refinement Method for CFD Applications written by Oscar Luis Antepara Zambrano and published by . This book was released on 2019 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this thesis is the development of an adaptive mesh refinement (AMR) algorithm for computational fluid dynamics simulations using hexahedral and tetrahedral meshes. This numerical methodology is applied in the context of large-eddy simulations (LES) of turbulent flows and direct numerical simulations (DNS) of interfacial flows, to bring new numerical research and physical insight. For the fluid dynamics simulations, the governing equations, the spatial discretization on unstructured grids and the numerical schemes for solving Navier-Stokes equations are presented. The equations follow a discretization by conservative finite-volume on collocated meshes. For the turbulent flows formulation, the spatial discretization preserves symmetry properties of the continuous differential operators and the time integration follows a self-adaptive strategy, which has been well tested on unstructured grids. Moreover, LES model consisting of a wall adapting local-eddy-viscosity within a variational multi-scale formulation is used for the applications showed in this thesis. For the two-phase flow formulation, a conservative level-set method is applied for capturing the interface between two fluids and is implemented with a variable density projection scheme to simulate incompressible two-phase flows on unstructured meshes. The AMR algorithm developed in this thesis is based on a quad/octree data structure and keeps a relation of 1:2 between levels of refinement. In the case of tetrahedral meshes, a geometrical criterion is followed to keep the quality metric of the mesh on a reasonable basis. The parallelization strategy consists mainly in the creation of mesh elements in each sub-domain and establishes a unique global identification number, to avoid duplicate elements. Load balance is assured at each AMR iteration to keep the parallel performance of the CFD code. Moreover, a mesh multiplication algorithm (02) is reported to create large meshes, with different kind of mesh elements, but preserving the topology from a coarser original mesh. This thesis focuses on the study of turbulent flows and two-phase flows using an AMR framework. The cases studied for LES of turbulent flows applications are the flow around one and two separated square cylinders, and the flow around a simplified car model. In this context, a physics-based refinement criterion is developed, consisting of the residual velocity calculated from a multi-scale decomposition of the instantaneous velocity. This criteria ensures grid adaptation following the main vortical structures and giving enough mesh resolution on the zones of interest, i.e., flow separation, turbulent wakes, and vortex shedding. The cases studied for the two-phase flows are the DNS of 2D and 3D gravity-driven bubble, with a particular focus on the wobbling regime. A study of rising bubbles in the wobbling regime and the effect of dimensionless numbers on the dynamic behavior of the bubbles are presented. Moreover, the use of tetrahedral AMR is applied for the numerical simulation of gravity-driven bubbles in complex domains. On this topic, the methodology is validated on bubbles rising in cylindrical channels with different topology, where the study of these cases contributed to having new numerical research and physical insight in the development of a rising bubble with wall effects.
Author : Gunther H. Weber
Publisher :
ISBN 13 : 9783936890211
Total Pages : 169 pages
Book Rating : 4.8/5 (92 download)
Download or read book Visualization of Adaptive Mesh Refinement Data and Topology Based Exploration of Volume Data written by Gunther H. Weber and published by . This book was released on 2003 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 682 pages
Book Rating : 4.F/5 ( download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
