Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory


Lori A Diachin


Email: diachin2@llnl.gov
Phone: 925-422-7130


Lori Diachin is the Director for the Center for Applied Scientific Computing and Research Program Manager and Point of Contact for the Office of Science Advanced Scientific Computing Research organization. She also leads the Frameworks Algorithms and Scalable Technologies for Mathematics (FASTMath) SciDAC center.

Her research interests are in the area of numerical analysis and scientific computing software development. In particular,  she has worked on optimization-based mesh quality improvement algorithms and their deployment in the software tooklits, the development of intero perable meshing and discretization software, and interactive access to remote large-scale data.

Lori earned her Ph.D. in Applied Mathematics from the University of Virginia in 1992. She also holds a Masters of Applied Mathematics from the University of Virgina and a B.A. in Mathemathics from Edinboro University of Pennsylvania. She joined Lawrence Livermore National Laboratory in 2003.

Selected Publications

Ollivier-Gooch, C., L. Diachin, M. S. Shephard, T. Tautges, J. Kraftcheck, V. Leung, X. J. Luo and M. Miller (2010). "An Interoperable, Data-Structure-Neutral Component for Mesh Query and Manipulation." ACM Transactions on Mathematical Software,37(3).

Chand, K. K., L. F. Diachin, X. L. Li, C. Ollivier-Gooch, E. S. Seol, M. S. Shephard, T. Tautges and H. Trease (2008). "Toward interoperable mesh, geometry and field components for PDE simulation development." Engineering with Computers24 (2): 165-182.

Interoperable mesh and geometry tools for advanced petascale simulations, L.A. Diachin, A.C. Bauer, B. Fix, J. Kraftcheck, K. Jansen, X. Luo, M. Miller, C. Ollivier –Gooch, M.S> Shephard, T. Tautges, H. Trease, Journal of Physics Conference Series, SciDAC 2007, (Editor, David Keyes, et. al.), IOP Publishing, Volume 78, 2007.

Parallel Adaptive Simulations on Unstructured Meshes, M.S. Shephard, K.E. Jansen, O. Sahni, L.A. Diachin, Journal of Physics Conference Series, SciDAC 2007, (Editor, David Keyes, et. al.), IOP Publishing, Volume 78, 2007.

Parallel PDE-Based Simulations Using the Common Component Architecture, (with L. C. McInnes, B. A. Allan, R. Armstrong, S. J. Benson, D. E. Bernholdt, T. L. Dahlgren, M. Krishnan, J. A. Kohl, J. W. Larson, S. Lefantzi, J. Nieplocha, B. Norris, S. G. Parker, J. Ray, and S. Zhou),  Numerical Solution of PDEs on Parallel Computers (Editors A. M. Bruaset and A. Tveito), Springer, pages 327-384, 2006.

Parallel Adaptive Mesh Refinement, (with Richard Hornung, Paul Plassmann, Andrew Wissink), Parallel Processing for Scientific Computing (Editors Mike Heroux, Padma Raghavan, and Horst Simon), SIAM, pages 143-162, 2006.

A Comparison of Two Optimization Methods for Mesh Quality Improvement, (with Patrick Knupp, Todd Munson, Suzanne Shontz), Engineering with Computers, Volume 22, pages 61-74, 2006.

Parallel Components for PDEs and Optimization: Some Issues and Experience, (with Boyana Norris, Satish Balay, Steven Benson, Paul Hovland, Lois McInnes, and Barry Smith), Parallel Computing, 28(12), 1811-1831, 2002.

Tetrahedral Mesh Improvement Via Optimization of the Element Condition Number, (with Patrick Knupp), International Journal for Numerical Methods in Engineering}, Volume 53, pages 1377-1391, 2002.

Freitag, Lori and Ray Loy, "Comparison of Remote Visualization Strategies for Interactive Exploration of Large Data Sets," to appear in International Journal of Information, submitted March 2002.

Norris, Boyana, Satish Balay, Steven Benson, Paul Hovland, Lois McInnes, Lori Freitag, and Barry Smith, “Parallel Components for PDEs and Optimization: Some Issues and Experiences,” to appear in Parallel Computing, submitted February 2002.

Freitag, Lori and Patrick Knupp, “Tetrahedral Mesh Improvement Via Optimization of the Element Condition Number,” International Journal for Numerical Methods in Engineering, Volume 53 (2002), pp. 1377–1391.

Freitag, Lori and Paul Plassmann, “Local Optimization-based Simplicial Mesh Untangling and Improvement,” International Journal of Numerical Methods in Engineering, Volume 49/1-2 (July 2000), pp. 109–125.

Freitag, Lori and Carl Ollivier-Gooch, “A Cost/Benefit Analysis of Simplicial Mesh Improvement Techniques as Measured by Solution Efficiency,” International Journal of Computational Geometry and Applications, Volume 10/4 (2000), pp. 361–382.

Freitag, Lori and Tim Urness, “Comparative Visualization Techniques to Analyze Aluminum Smelting Furnace Efficiency in a Virtual Reality Environment,” to appear Transactions of ASME, Journal of Manufacturing Science and Engineering, submitted January 1999.

Diachin, Darin, Lori Freitag, Daniel Heath, Jim Herzog, William Michels, “Interactive Simulation and Visualization of Massless, Massed, and Evaporating Particles,” Institute of Industrial Engineers Transactions, Kluwer Academic Publishers, Volume 30/7 (1998), pp. 621–628.

Freitag, Lori and Carl Olliver-Gooch, “Tetrahedral Mesh Improvement Using Face Swapping and Smoothing,” International Journal for Numerical Methods in Engineering, J. Wiley and Sons, Volume 40 (1997), pp. 3979–4002.

Freitag, Lori, Mark Jones, and Paul Plassmann, “A Parallel Algorithm for Mesh Smoothing,” SIAM Journal of Scientific Computing, submitted May 1997.

Diachin, Darin, Lori Freitag, Daniel Heath, James Herzog, William Michels, and Paul Plassmann, “Collaborative Virtual Environments used in the Design of Pollution Control Systems,” International Journal of Supercomputer Applications, Volume 10.2 (November 1996), pp. 223–235.

Freitag, Lori and James M. Ortega, “The RSCG Algorithm on Distributed Memory Architectures,” Journal of Numerical Linear Algebra with Applications, Volume 2/5 (September-October 1995), pp. 404–414.

Freitag, Lori, “Virtual Reality Simulations,” Computational Fluid Dynamics in Industrial Combustion, Editors Charles Baukul and Vladimir Gershtein, CRC Press LLC, 2001.

Freitag, Lori, Mark Jones, and Paul Plassmann, “The Scalability of Mesh Improvement Algorithms,” Algorithms for Parallel Processing, Editors Michael Heath, Abhiram Ranade, and Robert Schreiber, IMA Volumes in Mathematics and its Applications, Springer-Verlag, Volume 105 (1998), pp. 185–212.

Brown, David, Lori Freitag, and Jim Glimm, “The Terascale Simulation Tools and Technologies Center,” Proceedings of the Eighth International Conference on Numerical Grid Generation in Computational Field Simulations, June 2002.

Freitag, Lori, Thomas Leurent, Patrick Knupp, and Darryl Melander, “MESQUITE: Mesh Quality Improvement Toolkit,” Proceedings of the Eighth International Conference on Numerical Grid Generation in Computational Field Simulations, June 2002.

Freitag, Lori, Patrick Knupp, Todd Munson, and Suzanne Shontz, “A Survey of Optimization Software for Mesh Shape-Quality Improvement Problems,” Proceedings of the 11th International Meshing Roundtable, May 2002.

Freitag, Lori and Paul Plassmann, “Local Optimization-based Untangling Algorithms for Quadrilateral Meshes,” Proceedings of the 10th International Meshing Roundtable, Newport Beach, California, October 2001.

Freitag, Lori and Raymond Loy, “Comparison of Remote Visualization Strategies for Interactive Exploration of Large Data Sets,” Proceedings of the 2nd Workshop on Parallel and Distributed Scientific and Engineering Computing with Applications, San Francisco, April 2001.

Freitag, Lori and Raymond Loy, “Using Desktop Graphics Workstations for Interactive Remote Exploration of Large Date Sets,” Proceedings of the Visualization Development Environments Workshop, Princeton, NJ, April, 2000 (http://w3.pppl.gov/vde20000/eproceedings).

Freitag, Lori and Patrick Knupp, “Tetrahedral Element Shape Optimization via the Jacobian Determinant and Condition Number,” Proceedings of the Eighth International Meshing Roundtable, Lake Tahoe, California, October 1999.

Freitag, Lori and Raymond Loy, “Adaptive Multiresolution Visualization of Large Data Sets Using Parallel Octrees,” SC99 Conference Proceedings, Portland, Oregon, November 1999.

Freitag, Lori, “On Combining Laplacian and Optimization-based Mesh Smoothing Techniques,” Trends in Unstructured Mesh Generation, ASME Applied Mechanics Division, Volume AMD-Vol 220 (1997), pp. 37–44.

Freitag, Lori and Carl Ollivier-Gooch, “A Comparison of Tetrahedral Mesh Improvement Techniques,” Proceedings of the Fifth International Meshing Roundtable, Pittsburgh, Pennsylvania, October 1996, pp. 87–100.

Canfield, Tom, Darin Diachin, Lori Freitag, Daniel Heath, Jim Herzog, and William Michels, “Interactive Computational Models of Particle Dynamics Using Virtual Reality,” Proceedings of the Symposium on Virtual Reality in Manufacturing Research and Education, Chicago, Illinois, October 1996, pp. 80–88.

Diachin, Darin, Lori Freitag, Daniel Heath, James Herzog, William Michels, and Paul Plassmann, “Interactive Simulation and Analysis of Emission Reduction Systems for Commercial Boilers,” Proceedings of the SCS '96 Multiconference, April 1996, pp. 352–357.

Freitag, Lori, Mark Jones, and Paul Plassmann, “An Efficient Parallel Algorithm for Mesh Smoothing,” Proceedings of the Fourth International Meshing Roundtable, Albuquerque, New Mexico, October 1995, pp. 47–58.

Freitag, Lori, Mark Jones, and Paul Plassmann, “New Advances in the Modeling of High Temperature Superconductors,” Proceedings of the 1994 SCS Simulation MultiConference, La Jolla, California, April 1994, pp. 208–213.