I am the manager of the Computational Multiscale Department (Org. 1444) in the Center for Computing Research at Sandia National Laboratories. My managerial role and technical background are in the development, implementation, and application of multiscale, multiphysics techniques for materials modeling and computational solid mechanics. I am a graduate of the University of Colorado at Boulder, where I earned BS, MS, and PhD degrees in Mechanical Engineering. Prior to joining Sandia, I was a research associate at Rensselaer Polytechnic Institute. In addition to my research work, I have served as a course instructor at Rensselaer Polytechnic Institute and Syracuse University. My professional experience includes working as a Project Engineer for BNP Associates, Inc., and serving as a member of the Quark Research Lab at Quark, Inc.
The Computational Multiscale Department performs world-class research and development in physics-based materials modeling and high-performance computing. We combine expertise across multiple disciplines to solve science and engineering problems in support of the DOE mission. Our team brings together experts in density functional theory, molecular dynamics, direct simulation Monte Carlo, microstructure modeling, continuum mechanics, equations of state, and peridynamics. We lead a number of software development efforts, including the LAMMPS molecular dynamics code, and strive to advance the state of the art in materials modeling through a broad range of collaborations across the laboratories.
Peridigm, an open-source peridynamics code.
Sandia's Computing Research Center.
Sandia's Advanced Simulation and Computing (ASC) home page.
The Exascale Computing Project.
The Trilinos Project.
Recent Publications and Presentations
David J. Littlewood, Reese E. Jones, Nicolas M. Morales, Julia A. Plews, Ulrich Hetmaniuk, and Jonathan J. Lifflander. 2021. Hierarchical parallelism for transient solid mechanics simulations. Proceedings of the 14th WCCM-ECCOMAS Congress 2020, Paris, France. doi.
Marta D'Elia, Pavel Bochev, David J. Littlewood, and Mauro Perego. 2019. Optimization-based coupling of local and nonlocal models: Applications to peridynamics. In George Z. Voyiadjis, editor, Handbook of Nonlocal Continuum Mechanics for Materials and Structures. Springer. doi.
Pablo Seleson and David J. Littlewood. Numerical tools for effective meshfree discretizations of peridynamic models. In George Z. Voyiadjis, editor, Handbook of Nonlocal Continuum Mechanics for Materials and Structures. Springer. doi.
Timothy B. Costa, Stephen D. Bond, and David J. Littlewood. 2018. Nonlocal and Mixed-Locality Multiscale Finite Element Methods. Multiscale Modeling and Simulation: A SIAM Interdisciplinary Journal 16, 503-527. doi.
Coleman N. Alleman, James W. Foulk III, Alejandro Mota, Hojun Lim, and David J. Littlewood. 2018. Concurrent Multiscale Modeling of Microstructural Effects on Localization Behavior in Finite Deformation Solid Mechanics. Computational Mechanics 61, 207-218. doi.
Janine Bennett, Matthew Bettencourt, Robert Clay, Harold Edwards, Micheal Glass, David Hollman, Hemanth Kolla, Jonathan Lifflander, David Littlewood, Aram Markosyan, Stan Moore, Stephen Olivier, J. Antonio Perez, Eric Phipps, Francesco Rizzi, Nicole Slattengren, Daniel Sunderland, and Jeremiah Wilke. 2017. ASC ATDM Level 2 Milestone #6015: Asynchronous Many-Task Software Stack Demonstration. Report SAND2017-9980. Sandia National Laboratories, Albuquerque, NM and Livermore, CA. pdf.
David Littlewood, Stewart Silling, Paul Demmie. 2016. Identification of Fragments in a Meshfree Peridynamic Simulation. Proceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition, Phoenix, Arizona. doi.
Marta D'Elia, Mauro Perego, Pavel Bochev, and David Littlewood. 2016. A Coupling Strategy for Nonlocal and Local Diffusion Models with Mixed Volume Constraints and Boundary Conditions. Computers and Mathematics with Applications 71, 2218-2230. doi.
Pablo Seleson and David J. Littlewood. 2016. Convergence Studies in Meshfree Peridynamic Simulations. Computers and Mathematics with Applications 71, 2432-2448. doi.
Bishop, J.E., Emery, J.M., Battaile, C.C., Littlewood, D.J., and Baines, A.J. 2016. Direct Numerical Simulations in Solid Mechanics for Quantifying the Macroscale Effects of Microstructure and Material Model-Form Error. JOM: The Journal of the Minerals, Metals, and Materials Society. doi.
John A. Mitchell, Stewart A. Silling, and David J. Littlewood. 2015. A Position-Aware Linear Solid Constitutive Model for Peridynamics. Journal of Mechanics of Materials and Structures 10(5), 539-557. doi.
Stewart A. Silling, David J. Littlewood, and Pablo Seleson. 2015. Variable Horizon in a Peridynamic Medium. Journal of Mechanics of Materials and Structures 10(5), 591-612. doi.
Timothy Costa, Stephen Bond, David Littlewood, and Stan Moore. 2015. Peridynamic Multiscale Finite Element Methods. Report SAND2015-10472. Sandia National Laboratories, Albuquerque, NM and Livermore, CA. pdf.
David Littlewood, Mike Hillman, Edouard Yreux, Joseph Bishop, Frank Beckwith, Jiun-Shyan Chen. 2015. Implementation and verification of RKPM in the Sierra/SolidMechanics Analysis Code. Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition, Houston, Texas. doi.
David J. Littlewood. 2015. Roadmap for Peridynamic Software Implementation. Report SAND2015-9013. Sandia National Laboratories, Albuquerque, NM and Livermore, CA. pdf.
David J. Littlewood, Stewart A. Silling, John A. Mitchell, Pablo D. Seleson, Stephen D. Bond, Michael L. Parks, Daniel Z. Turner, Damon J. Burnett, Jakob Ostien, and Max Gunzburger. 2015. Strong Local-Nonlocal Coupling for Integrated Fracture Modeling. Report SAND2015-7998. Sandia National Laboratories, Albuquerque, NM and Livermore, CA. pdf.
Bishop, J.E., Emery, J.M., Field, R., Weinberger, C., and Littlewood, D.J. 2015. Direct Numerical Simulations in Solid Mechanics for Understanding the Macroscale Effects of Microscale Material Variability. Computer Methods in Applied Mechanics and Engineering 287, 262-289. doi.
David Littlewood, Kyran Mish, and Kendall Pierson. 2012. Peridynamic Simulation of Damage Evolution for Structural Health Monitoring. Proceedings of the ASME 2012 International Mechanical Engineering Congress and Exposition, Houston, Texas. doi.
Devin M. Pyle, Jing Lu, David J. Littlewood, and Antoinette M. Maniatty. 2012. Effect of 3D Grain Structure Representation in Polycrystal Simulations. Computational Mechanics. doi.
David Littlewood, John Foster, and Brad Boyce. Peridynamic Modeling of Localization in Ductile Metals. 22th International Workshop on Computational Mechanics of Materials, Baltimore, Maryland, September 24-26, 2012. slides.
Littlewood, David. 2011. A Nonlocal Approach to Modeling Crack Nucleation in AA 7075-T651. Proceedings of the ASME 2011 International Mechanical Engineering Congress and Exposition, Denver, Colorado. doi.
David Littlewood and Tracy Vogler. Modeling Dynamic Fracture with Peridynamics, Finite Element Modeling, and Contact. 11th US National Congress on Computational Mechanics, Minneapolis, Minnesota, July 25-28, 2011. slides.
J.D. Hochhalter, D.J. Littlewood, M.J. Veilleux, J.E. Bozek, A.M. Maniatty, A.D. Rollett, and A.R. Ingraffea. 2011. A Geometric Approach to Modeling Microstructurally Small Fatigue Crack Formation: III. Development of a Semi-Empirical Model for Nucleation. Modelling and Simulation in Materials Science and Engineering 19(3). doi.
Littlewood, David. 2010. Simulation of Dynamic Fracture using Peridynamics, Finite Element Modeling, and Contact. Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition, Vancouver, British Columbia, Canada. doi.
J.D. Hochhalter, D.J. Littlewood, R.J. Christ Jr., M.J. Veilleux, J.E. Bozek, A.R. Ingraffea, and A.M. Maniatty. 2010. A Geometric Approach to Modeling Microstructurally Small Fatigue Crack Formation: II. Physically Based Modeling of Microstructure-Dependent Slip Localization and Actuation of the Crack Nucleation Mechanism in AA 7075-T651. Modelling and Simulation in Materials Science and Engineering 18(4). doi.
J.E. Bozek, J.D. Hochhalter, M.G. Veilleux, M. Liu, G. Heber, S.D. Sintay, A.D. Rollett, D.J. Littlewood, A.M. Maniatty, H. Weiland, R.J. Christ Jr., J. Payne, G. Welsh, D.G. Harlow, P.A. Wawrzynek, and A.R. Ingraffea. 2008. A Geometric Approach to Modeling Microstructurally Small Fatigue Crack Formation: I. Probabilistic Simulation of Constituent Particle Cracking in AA 7075-T651. Modelling and Simulation in Materials Science and Engineering 16(6). doi.
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