14Th U.S. National Congress on Computational Mechanics
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Program :: Monday 9
Comandatuba 1 Comandatuba 2 Comandatuba 3 Auditório Transamérica Una Ilhéus São Paulo 3 São Paulo 2 São Paulo 1 Quito Santiago th Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7 Room 8 Room 9 Room 10 Room 11 8h30-9h15 Opening Ceremony 9h15-10h Plenary Thomas J.R. Hughes 10h-10h30 Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break 10h30-12h30 MS 094 MS 106 MS 099 MS 074 MS 142 MS 133 MS 001 MS 075 MS 085 MS 002 Satellite Symposium 12h30-13h30 Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch :: Lunch Brasília Semi-Plenary 1a Semi-Plenary 1b Semi-Plenary 2c Wing Semi-Plenary 1d 13h30-14h Pedro M. Reis Kumar Tamma Kam Liu Álvaro Coutinho Semi-Plenary 2a Semi-plenary 2b Semi-Plenary 2c Semi-Plenary 2d 14h-14h30 Eitan Grinspun Ramon Codina Djordje Peric Paulo Lyra 14h30-16h30 MS 094 MS 106 / MS 035 MS 099 MS 074 MS 142 MS 133 MS 001 MS 075 MS 085 MS 002 16h30-17h Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break :: Coffee Break 17h-19h MS 094 / MS 163 MS 132 MS 099 MS 171 MS 142 / MS 005 MS 116 MS 001 MS 075 MS 085 MS 002 Program :: Monday 9 Brasília 3 Brasília 2 Brasília 1 Buenos Aires Montevideo Room Room Room Room Room Room Room Room -
Magnetorheological Fluid and Its Applications
International Journal of Current Engineering and Technology E-ISSN 2277 – 4106, P-ISSN 2347 – 5161 ©2017 INPRESSCO®, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article Magnetorheological Fluid and its Applications Pranav Gadekar*, V.S.Kanthale and N.D.Khaire Mechanical Department, MITCOE, Pune University, Pune, Maharashtra, India Accepted 12 March 2017, Available online 16 March 2017, Special Issue-7 (March 2017) Abstract A Magneto rheological Fluid (MRF) is a Smart fluid whose viscosity can be varied by application of magnetic field. The MR Fluid has vast applications in various engineering as well as day to day life. There is huge potential that this revolutionary material will provide many leading edge applications. The fluid has applications in various fields such as automotive industry, household applications, prosthetics, civil engineering, hydraulics, brakes and clutches, etc. Also there is a possible application of the fluid in reducing the effect of Gun Recoil. This paper will describe these applications and working of proposed application. Keywords: MR Fluid, Viscosity, Dampers, Prosthetics, Gun Recoil. 1. Introduction To take full advantage of MRF technologythe base fluid must have a low viscosity and it should be constant 1 Rheos is a Greek word to Flow. Rheology is the science with temperature. This is required for variation due to if material flow under external load conditions. The applied magnetic field to be more effective than natural word Magnetorheological Fluid means fluid whose viscosity. The presences of suspended particles make apparent viscosity increases, with application of base fluid thicker. Commonly used base fluids are MAGNETIC field. Also known as MR fluids, these fluids mineral oils, hydrocarbon oils, and Silicon oils. -
Analysis-Guided Improvements of the Material Point Method
ANALYSIS-GUIDED IMPROVEMENTS OF THE MATERIAL POINT METHOD by Michael Dietel Steffen A dissertation submitted to the faculty of The University of Utah in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computing School of Computing The University of Utah December 2009 Copyright c Michael Dietel Steffen 2009 ° All Rights Reserved THE UNIVERSITY OF UTAH GRADUATE SCHOOL SUPERVISORY COMMITTEE APPROVAL of a dissertation submitted by Michael Dietel Steffen This dissertation has been read by each member of the following supervisory committee and by majority vote has been found to be satisfactory. Chair: Robert M. Kirby Martin Berzins Christopher R. Johnson Steven G. Parker James E. Guilkey THE UNIVERSITY OF UTAH GRADUATE SCHOOL FINAL READING APPROVAL To the Graduate Council of the University of Utah: I have read the dissertation of Michael Dietel Steffen in its final form and have found that (1) its format, citations, and bibliographic style are consistent and acceptable; (2) its illustrative materials including figures, tables, and charts are in place; and (3) the final manuscript is satisfactory to the Supervisory Committee and is ready for submission to The Graduate School. Date Robert M. Kirby Chair, Supervisory Committee Approved for the Major Department Martin Berzins Chair/Dean Approved for the Graduate Council Charles A. Wight Dean of The Graduate School ABSTRACT The Material Point Method (MPM) has shown itself to be a powerful tool in the simulation of large deformation problems, especially those involving complex geometries and contact where typical finite element type methods frequently fail. While these large complex problems lead to some impressive simulations and so- lutions, there has been a lack of basic analysis characterizing the errors present in the method, even on the simplest of problems. -
Development of an Energy-Harvesting Magnetorheological Fluid Damper
University of Wollongong Research Online University of Wollongong Thesis Collection 1954-2016 University of Wollongong Thesis Collections 2016 Development of an energy-harvesting magnetorheological fluid damper Yun Lu University of Wollongong Follow this and additional works at: https://ro.uow.edu.au/theses University of Wollongong Copyright Warning You may print or download ONE copy of this document for the purpose of your own research or study. The University does not authorise you to copy, communicate or otherwise make available electronically to any other person any copyright material contained on this site. You are reminded of the following: This work is copyright. Apart from any use permitted under the Copyright Act 1968, no part of this work may be reproduced by any process, nor may any other exclusive right be exercised, without the permission of the author. Copyright owners are entitled to take legal action against persons who infringe their copyright. A reproduction of material that is protected by copyright may be a copyright infringement. A court may impose penalties and award damages in relation to offences and infringements relating to copyright material. Higher penalties may apply, and higher damages may be awarded, for offences and infringements involving the conversion of material into digital or electronic form. Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong. Recommended Citation Lu, Yun, Development of an energy-harvesting magnetorheological fluid damper, Master of Philosophy thesis, School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, 2016. -
Scalable Large-Scale Fluid-Structure Interaction Solvers in the Uintah Framework Via Hybrid Task-Based Parallelism Algorithms
1 Scalable Large-scale Fluid-structure Interaction Solvers in the Uintah Framework via Hybrid Task-based Parallelism Algorithms Qingyu Meng, Martin Berzins UUSCI-2012-004 Scientific Computing and Imaging Institute University of Utah Salt Lake City, UT 84112 USA May 7, 2012 Abstract: Uintah is a software framework that provides an environment for solving fluid-structure interaction problems on structured adaptive grids on large-scale science and engineering problems involving the solution of partial differential equations. Uintah uses a combination of fluid-flow solvers and particle-based methods for solids, together with adaptive meshing and a novel asynchronous task-based approach with fully automated load balancing. When applying Uintah to fluid-structure interaction problems with mesh refinement, the combination of adaptive meshing and the move- ment of structures through space present a formidable challenge in terms of achieving scalability on large-scale parallel computers. With core counts per socket continuing to grow along with the prospect of less memory per core, adopting a model that uses MPI to communicate between nodes and a shared memory model on-node is one approach to achieve scalability at full machine capacity on current and emerging large-scale systems. For this approach to be successful, it is necessary to design data-structures that large numbers of cores can simultaneously access without contention. These data structures and algorithms must also be designed to avoid the overhead involved with locks and other synchronization primitives when running on large number of cores per node, as contention for acquiring locks quickly becomes untenable. This scalability challenge is addressed here for Uintah, by the development of new hybrid runtime and scheduling algorithms combined with novel lockfree data structures, making it possible for Uintah to achieve excellent scalability for a challenging fluid-structure problem with mesh refinement on as many as 260K cores. -
The Material-Point Method for Granular Materials
Comput. Methods Appl. Mech. Engrg. 187 (2000) 529±541 www.elsevier.com/locate/cma The material-point method for granular materials S.G. Bardenhagen a, J.U. Brackbill b,*, D. Sulsky c a ESA-EA, MS P946 Los Alamos National Laboratory, Los Alamos, NM 87545, USA b T-3, MS B216 Los Alamos National Laboratory, Los Alamos, NM 87545, USA c Department of Mathematics and Statistics, University of New Mexico, Albuquerqe, NM 87131, USA Abstract A model for granular materials is presented that describes both the internal deformation of each granule and the interactions between grains. The model, which is based on the FLIP-material point, particle-in-cell method, solves continuum constitutive models for each grain. Interactions between grains are calculated with a contact algorithm that forbids interpenetration, but allows separation and sliding and rolling with friction. The particle-in-cell method eliminates the need for a separate contact detection step. The use of a common rest frame in the contact model yields a linear scaling of the computational cost with the number of grains. The properties of the model are illustrated by numerical solutions of sliding and rolling contacts, and for granular materials by a shear calculation. The results of numerical calculations demonstrate that contacts are modeled accurately for smooth granules whose shape is resolved by the computation mesh. Ó 2000 Elsevier Science S.A. All rights reserved. 1. Introduction Granular materials are large conglomerations of discrete macroscopic particles, which may slide against one another but not penetrate [9]. Like a liquid, granular materials can ¯ow to assume the shape of the container. -
References (In Progress)
R References (in progress) R–1 Appendix R: REFERENCES (IN PROGRESS) TABLE OF CONTENTS Page §R.1 Foreword ...................... R–3 §R.2 Reference Database .................. R–3 R–2 §R.2 REFERENCE DATABASE §R.1. Foreword Collected references for most Chapters (except those in progress) for books Advanced Finite Element Methods; master-elective and doctoral level, abbrv. AFEM Advanced Variational Methods in Mechanics; master-elective and doctoral level, abbrv. AVMM Fluid Structure Interaction; doctoral level, abbrv. FSI Introduction to Aerospace Structures; junior undergraduate level, abbrv. IAST Matrix Finite Element Methods in Statics; senior-elective and master level, abbrv. MFEMS Matrix Finite Element Methods in Dynamics; senior-elective and master level, abbrv. MFEMD Introduction to Finite Element Methods; senior-elective and master level, abbrv. IFEM Nonlinear Finite Element Methods; master-elective and doctoral level, abbrv. NFEM Margin letters are to facilitate sort; will be removed on completion. Note 1: Many books listed below are out of print. The advent of the Internet has meant that it is easier to surf for used books across the world without moving from your desk. There is a fast search “metaengine” for comparing prices at URL http://www.addall.com: click on the “search for used books” link. Amazon.com has also a search engine, which is poorly organized, confusing and full of unnecessary hype, but does link to online reviews. [Since about 2008, old scanned books posted online on Google are an additional potential source; free of charge if the useful pages happen to be displayed. Such files cannot be downloaded or printed.] Note 2. -
Magnetic Fluid Rheology and Flows
Current Opinion in Colloid & Interface Science 10 (2005) 141 – 157 www.elsevier.com/locate/cocis Magnetic fluid rheology and flows Carlos Rinaldi a,1, Arlex Chaves a,1, Shihab Elborai b,2, Xiaowei (Tony) He b,2, Markus Zahn b,* a University of Puerto Rico, Department of Chemical Engineering, P.O. Box 9046, Mayaguez, PR 00681-9046, Puerto Rico b Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Laboratory for Electromagnetic and Electronic Systems, Cambridge, MA 02139, United States Available online 12 October 2005 Abstract Major recent advances: Magnetic fluid rheology and flow advances in the past year include: (1) generalization of the magnetization relaxation equation by Shliomis and Felderhof and generalization of the governing ferrohydrodynamic equations by Rosensweig and Felderhof; (2) advances in such biomedical applications as drug delivery, hyperthermia, and magnetic resonance imaging; (3) use of the antisymmetric part of the viscous stress tensor due to spin velocity to lower the effective magnetoviscosity to zero and negative values; (4) and ultrasound velocity profile measurements of spin-up flow showing counter-rotating surface and co-rotating volume flows in a uniform rotating magnetic field. Recent advances in magnetic fluid rheology and flows are reviewed including extensions of the governing magnetization relaxation and ferrohydrodynamic equations with a viscous stress tensor that has an antisymmetric part due to spin velocity; derivation of the magnetic susceptibility -
Peridynamics Review
Peridynamics Review Ali Javilia,∗, Rico Morasataa, Erkan Oterkusb, Selda Oterkusb aDepartment of Mechanical Engineering, Bilkent University, 06800 Ankara, Turkey bDepartment of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow, United Kingdom Abstract Peridynamics (PD) is a novel continuum mechanics theory established by Stewart Silling in 2000 [1]. The roots of PD can be traced back to the early works of Gabrio Piola according to dell'Isola et al. [2]. PD has been attractive to researchers as it is a nonlocal formulation in an integral form; unlike the local differential form of classical continuum mechanics. Although the method is still in its infancy, the literature on PD is fairly rich and extensive. The prolific growth in PD applications has led to a tremendous number of contributions in various disciplines. This manuscript aims to provide a concise description of the peridynamic theory together with a review of its major applications and related studies in different fields to date. Moreover, we succinctly highlight some lines of research that are yet to be investigated. Keywords: Peridynamics, Continuum mechanics, Fracture, Damage, Nonlocal elasticity 1. Introduction The analysis of material behavior due to various types of loading and boundary conditions may be carried out at different length scales. At the nanoscale, often Molecular Dynamics (MD) is used to analyze the behavior of atoms and molecules. However, simulation time, integration algorithms and the required computational power are limiting factors to the method’s capabilities. On the other hand, at the macroscale, the behavior of a body is usually analyzed using the Classical Continuum Mechanics (CCM) formalism. -
Discretized Bond-Based Peridynamics for Solid Mechanics
DISCRETIZED BOND-BASED PERIDYNAMICS FOR SOLID MECHANICS By Wenyang Liu A DISSERTATION Submitted to Michigan State University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Civil Engineering 2012 ABSTRACT DISCRETIZED BOND-BASED PERIDYNAMICS FOR SOLID MECHANICS By Wenyang Liu The numerical analysis of spontaneously formed discontinuities such as cracks is a long- standing challenge in the engineering field. Approaches based on the mathematical frame- work of classical continuum mechanics fail to be directly applicable to describe discontinuities since the theory is formulated in partial differential equations, and a unique spatial deriva- tive, however, does not exist on the singularities. Peridynamics is a reformulated theory of continuum mechanics. The partial differential equations that appear in the classical contin- uum mechanics are replaced with integral equations. A spatial range, which is called the horizon δ, is associated with material points, and the interaction between two material points within a horizon is formed in terms of the bond force. Since material points separated by a finite distance in the reference configuration can interact with each other, the peridynamic theory is categorized as a nonlocal method. The primary focus in this research is the development of the discretized bond-based peridynamics for solid mechanics. A connection between the classical elasticity and the dis- cretized peridynamics is established in terms of peridynamic stress. Numerical micromoduli for one- and three-dimensional models are derived. The elastic responses of one- and three- dimensional peridynamic models are examined, and the boundary effect associated with the size of the horizon is discussed. A pairwise compensation scheme is introduced in this re- search for simulations of an elastic body of Poisson ratio not equal to 1/4. -
Mathematical and Numerical Analysis for Linear Peridynamic Boundary Value Problems
Mathematical and Numerical Analysis for Linear Peridynamic Boundary Value Problems by Hao Wu A dissertation submitted to the Graduate Faculty of Auburn University in partial fulfillment of the requirements for the Degree of Doctor of Philosophy Auburn, Alabama May 7, 2017 Keywords: peridynamics, nonlocal boundary value problems, finite-dimensional approximations, error estimates, exponential convergence. Copyright 2017 by Hao Wu Approved by Yanzhao Cao, Chair, Professor of Department of Mathematics and Statistics Junshan Lin, Asistant Professor of Department of Mathematics and Statistics Ulrich Albrecht, Professor of Department of Mathematics and Statistics Wenxian Shen, Professor of Department of Mathematics and Statistics Abstract Peridynamics is motivated in aid of modeling the problems from continuum mechanics which involve the spontaneous discontinuity forms in the motion of a material system. By replacing differentiation with integration, peridynamic equations remain equally valid both on and off the points where a discontinuity in either displacement or its spatial derivatives is located. A functional analytical framework was established in literature to study the linear bond- based peridynamic equations associated with a particular kind of nonlocal boundary condi- tion. Investigated were the finite-dimensional approximations to the solutions of the equa- tions obtained by spectral method and finite element method; as a result, two corresponding general formulas of error estimates were derived. However, according to these formulas, one can only conclude that the optimal convergence is algebraic. Based on this theoretical framework, first we show that analytic data functions produce analytic solutions. Afterwards, we prove these finite-dimensional approximations will achieve exponential convergence under the analyticity assumption of data. At the end, we validate our results by conducting a few numerical experiments. -
A Study of Active Engine Mounts
A Study of Active Engine Mounts Examensarbete utfört i Reglerteknik vid Tekniska Högskolan i Linköping av Fredrik Jansson & Oskar Johansson Reg nr: LiTH-ISY-EX-3453-2003 Linköping 2003 F. JANSSON O. JOHANSSON A Study of Active Engine Mounts Examensarbete utfört i Reglerteknik vid Linköpings tekniska högskola av Fredrik Jansson och Oskar Johansson Reg nr: LiTH-ISY-EX-3453-2003 Supervisor: Andreas Eidehall Linköpings Universitet Claes Olsson Volvo Car Corporation Examiner: Professor Fredrik Gustafsson Linköpings Universitet Linköping 17th December 2003 F. JANSSON O. JOHANSSON A STUDY OF ACTIVE ENGINE MOUNTS Avdelning, Institution Datum Division, Department Date 2003-12-17 Institutionen för systemteknik 581 83 LINKÖPING Språk Rapporttyp ISBN Language Report category Svenska/Swedish Licentiatavhandling X Engelska/English X Examensarbete ISRN LITH-ISY-EX-3453-2003 C-uppsats D-uppsats Serietitel och serienummer ISSN Title of series, numbering Övrig rapport ____ URL för elektronisk version http://www.ep.liu.se/exjobb/isy/2003/3453/ Titel Studie av aktiva motorkuddar Title A Study of Active Engine Mounts Författare Fredrik Jansson and Oskar Johansson Author Sammanfattning Abstract Achieving better NVH (noise, vibration, and harshness) comfort necessitates the use of active technologies when product targets are beyond the scope of traditional passive insulators, absorbers, and dampers. Therefore, a lot of effort is now being put in order to develop various active solutions for vibration control, where the development of actuators is one part. Active hydraulic engine mounts have shown to be a promising actuator for vibration isolation with the benefits of the commonly used passive hydraulic engine mounts in addition to the active ones.