NOTE: EVERYTHING BELOW THIS STATEMENT IS
HOPELESSLY OUT OF DATE. A NEW WEBPAGE IS UNDER CONSTRUCTION. IN THE
MEANTIME, IF YOU'RE INTERESTED IN ANY OF MY PAPERS, MY CV (LINKED
ABOVE) CONTAINS LINKS TO MOST OF MY PUBLISHED AND SUBMITTED PAPERS.
at the IEEE/ACM SC06
conference in Tampa, FL for our entry entitled "Remote Runtime
Steering of Integrated Terascale Simulation and Visualization." We
demonstrated the ability to visualize and steer large-scale earthquake
wave propagation simulations running at remote sites on parallel
supercomputers in real time.
Project (earthquake ground motion modeling in large basins, joint with
Jacobo Bielak, Yoshi Hisada, Loukas Kallivokas, Dave O'Hallaron, Jonathan
Shewchuk, and Thomas Gross; formerly NSF Grand Challenge and now NSF KDI project)
Project (Terascale Algorithms for Optimization of Simulations, joint
with Larry Biegler, Carnegie Mellon University). See George Biros'
PDE-constrained optimization software library Veltisto
Project (NSF-ITR project on simulation of flows with dynamic interfaces
on multi-teraflop computers, with applications to microstructural blood
flow modeling; joint with Guy Blelloch, Gary Miller, and Noel Walkington
at CMU, Jim Antaki at UPMC, George Turkiyyah at U of Washington,
K. Rajagopal at Texas A&M, and others.)
Optimal PDE Simulations) Center a DOE SciDAC (Scientific Discovery
through Advanced Computing) ISIC (Integrated Software
Infrastructure Center) (with Argonne, Lawrence Livermore, Lawrence
Berkeley, Old Dominion, UC Berkeley, CU-Boulder, Courant, and
Caliente Project Real
Time Optimization for Data Assimilation and Control of Large Scale
Dynamic Simulations (NSF-ITR project with Larry Biegler (CMU),
George Biros (Courant), Frank Fendell (Fendell Associates), Matthias
Heinkenschloss (Rice), David Keyes (Old Dominion), Bart van Bloemen
Waanders (Sandia), David Young (Boeing). Press
Project (artificial heart optimal design, joint with Jim Antaki and
Greg Burgreen, University of Pittsburgh Medical Center)
methodologies for coupled nonlinear field problems, joint with Jacobo Bielak)
Hippocrates (biomechanics-based surgical simulation, joint with Loukas
Kallivokas, and Branko Jaramaz and Tony DiGioia, Shadyside Hospital; part
of an NSF HPCC National Challenge project
L. Biegler, O. Ghattas, M. Heinkenschloss, and B. van Bloemen
Waanders, eds., Large-Scale
PDE-Constrained Optimization, Springer-Verlag, Lecture Notes in
Computational Science and Engineering, Vol. 30, July 2003.
Eric J. Schwabe, Guy E. Blelloch, Anja Feldmann,
Omar Ghattas, John R. Gilbert, Gary L. Miller, David R. O'Hallaron, Jonathan
R. Shewchuk, and Shang-Hua Teng, A Separator-Based Framework for Automated
Partitioning and Mapping of Parallel Algorithms for Numerical Solution
of PDEs, Proceedings of the 1992 DAGS/PC Symposium, Dartmouth Institute
for Advanced Graduate Studies, pages 48-62, June 1992. Abstract
(with BibTeX citation), PostScript
(2.2Mb, 15 pages).
Jonathan R. Shewchuk and Omar Ghattas, A
Compiler for Parallel Finite Element Methods with Domain-Decomposed Unstructured
Meshes, Proceedings of the Seventh International Conference on Domain
Decomposition Methods in Scientific and Engineering Computing (Pennsylvania
State University), Contemporary Mathematics 180 (David E. Keyes and Jinchao
Xu, editors), pages 445-450, American Mathematical Society, October 1993.
(with BibTeX citation), PostScript
(color, 1.2Mb, 6 pages).
Hesheng Bao, Jacobo Bielak, Omar Ghattas,
Loukas F. Kallivokas, David R. O'Hallaron, Jonathan R. Shewchuk, and Jifeng
Large-scale Simulation of Elastic Wave Propagation in Heterogeneous
Media on Parallel Computers, Computer Methods in Applied Mechanics
and Engineering, v.152, p.85-102, 1998. Abstract(with
BibTex citation), Compressed
PostScript (4.3Mb) and HTML.
Anja Feldmann, Omar Ghattas, John R. Gilbert,
Gary L. Miller, David R. O'Hallaron, Eric J. Schwabe, Jonathan R. Shewchuk,
and Shang-Hua Teng, Automated Parallel Solution of Unstructured PDE
Problems, working paper. PostScript
(b/w, 1.7Mb, 19 pages), PostScript
(color, 1.8Mb, 19 pages). Because color printing is expensive, you
may want to print a complete black and white copy; then use a color printer
to print the following file (which contains only the five color pages)
and replace the corresponding black and white pages.
(color pages only, 0.8Mb, 5 pages).
Omar Ghattas and Xiaogang Li, Domain decomposition
methods for sensitivity analysis of a nonlinear aeroelasticity problem,
International Journal of Computational Fluid Dynamics, Vol. 11, pp 113-130,
1998. (Special issue on flow control and optimization). Abstract,PostScript
(1.6Mb, 22 pages).
James F. Antaki, Guy E. Blelloch, Omar Ghattas,
Ivan Malcevic, Gary L. Miller, and Noel J. Walkington,
A Parallel Dynamic-Mesh
Lagrangian Method for Simulation of Flows with Dynamic Interfaces,
Proceedings of SC 2000, Dallas, Texas, USA, November 4-10,
2000. Portable Document Format (2.1Mb).
George Biros and Omar Ghattas, A
Lagrange-Newton-Krylov-Schur Method for PDE-Constrained
Optimization, SIAG/OPT News and Views (the newsletter of the SIAM
Activity Group on Optimization), Vol. 11, No. 2, August 2000. This
is a short (6 pages), high-level introduction to the
LNKS method for
PDE-constrained optimization. Portable Document Format
V. Akcelik, B. Jaramaz, and O,
Ghattas, Nearly Orthogonal Two-Dimensional Grid Generation with
Aspect Ratio Control, Journal of Computational Physics,
171(2):805-821, 2001. Portable
Document Format (0.6 Mb).
Jifeng Xu, Jacobo Bielak, Omar Ghattas,
and Jianlin Wang, Three-dimensional nonlinear seismic ground motion modeling
in inelastic basins, Physics of the Earth and Planetary Interiors,
137(1-4):81-95, 2003. Portable Document
Format (3.0 Mb).
Volkan Akcelik, George Biros, and Omar
Ghattas, Parallel Multiscale Gauss-Newton-Krylov Methods for
Inverse Wave Propagation, Proceedings of the IEEE/ACM SC2002
Conference, Baltimore, November 2002. Received Best Technical Paper
Award. Portable Document Format (0.6
George Biros and Omar
Ghattas, Inexactness Issues in Lagrange-Newton-Krylov-Schur
Methods for PDE-Constrained Optimization, Technical Report,
Mechanics, Algorithms, and Computing Lab, Carnegie Mellon University,
2002. Portable Document Format
Volkan Akcelik, George Biros, Omar
Ghattas, Kevin R. Long, and Bart van Bloemen Waanders, A
Variational Finite Element Method for Source Inversion for
Convective-Diffusive Transport, Finite Elements in Analysis and
Design, 39:683-705, 2003. Portable Document Format (3.5
Kwan-Liu Ma, Aleksander Stompel, Jacobo Bielak, Omar Ghattas, and Eui
Joong Kim, Visualizing Large-Scale Earthquake Simulations,,
Proceedings of ACM/IEEE SC 2003, Phoneix, AZ, 2003.
E. Kim, J. Bielak, and O. Ghattas,
Large-scale Northridge Earthquake simulation using octree-based
multiresolution mesh method, Proceedings of 16th ASCE Engineering
Mechanics Conference, Seattle, Washington, July 2003. Portable Document
Volkan Akcelik, Jacobo Bielak, George
Biros, Ioannis Epanomeritakis, Omar Ghattas, Loukas F. Kallivokas, Eui
Joong Kim, A framework for online inversion-based 3D site
characterization, Proceedings of the International Conference on
Computational Science, Krakow, Poland, June 2004. Portable Document Format
Judith Hill, Noel Walkington, and Omar
Ghattas, A parallel Eulerian method for flows with elastic
membranes, technical report, Ultrascale Simulation Laboratory,
2004. Portable Document Format
LF Kallivokas, SW Na, O Ghattas, B
Jaramaz, Assessment of a fictitious domain method for
patient-specific modeling of press-fit orthopaedic implantation ,
submitted Portable Document Format
V Akcelik, G Biros, A Draganescu,
O Ghattas, J Hill, and B van Bloeman Waanders, Dynamic data-driven
inversion for terascale simulations: Real-time identification of
airborne contaminants, Proceedings of SC2005, Seattle, WA,
November 2005. Portable Document Format
V Akcelik, G Biros, O Ghattas,
D Keyes, K Ko, LQ Lee, and E Ng, Adjoint methods for
optimization of the low-loss cavity for the
International Linear Collider, Journal of Physics Conference
Series. Portable Document Format
T. Tu, D. O'Hallaron, and O. Ghattas,
Scalable parallel octree meshing for terascale applications,
Proceedings of SC2005, Seattle, WA, November 2005. Portable Document Format
K. Willcox, O. Ghattas, B. van Bloemen
Waanders, and B. Bader, An optimization framework for
goal-oriented model-based reduction of large-scale systems,
Proceedings of IEEE Conferene on Decision and Control, Seville, Spain,
December 12-15, 2005. Portable Document Format
George Biros and Omar Ghattas,
Parallel Lagrange-Newton-Krylov-Schur Methods for PDE-Constrained
Optimization. Part I: The Krylov-Schur Solver, SIAM Journal on
Scientific Computing, 27(2):687-713, 2005.
Portable Document Format
George Biros and Omar Ghattas,
Parallel Lagrange-Newton-Krylov-Schur Methods for
PDE-Constrained Optimization. Part II:
The Lagrange-Newton Solver, and its Application to Optimal Control of
Steady Viscous Flows. SIAM Journal on
Scientific Computing, 27(2):714-739, 2005. Portable
Document Format (2.0Mb).
Jacobo Bielak, Omar Ghattas, and Eui
Parallel octree-based finite element method
for large-scale earthquake ground motion simulation,
Computer Modeling in Engineering and Sciences, 10(2):99-112, 2005. Portable
Document Format (3.7Mb).
V. Akcelik, G. Biros, O. Ghattas, J. Hill, D. Keyes, and B. van
Parallel algorithms for PDE-constrained optimization,
of Parallel Computing, M. Heroux, P. Raghaven, and
H. Simon, eds, SIAM, 2006. Portable
Document Format (0.3 Mb)
Orozco, "Large-Scale Shape Optimization: Numerical Methods, Parallel
Algorithms, and Applications to Aerodynamic Design," May 1993. Currently
Assistant Professor, Department of Civil Engineering and Applied Mechanics,
University of Virginia.
Li, "A Variational Finite Element Method for Fully-coupled Nonlinear
Fluid-Solid Interaction," December 1995. Currently at Algor, Inc., Pittsburgh,
Jaihyeong Bark, "Optimal Velocity Control
of Navier-Stokes Flows, with Applications to Viscous Drag Reduction," December
1995. Currently Assistant Professor, Department of Architectural Engineering, Mok-Won
Beichang He, "Shape Optimization of Navier-Stokes
Flows, with Application to Design of Artificial Heart Devices," May 1996.
Currently at General Electric Corporate Research and Development, Schenectady,
Xu, Three-dimensional Simulations of Wave Propagation in Inelastic
Media on Parallel Computers with Application to Seismic Response, January
1998 (co-advised with J. Bielak). Currently Mathematics and Computing
Specialist, Mathematics & Engineering Analysis, Boeing Phantom Works,
Bao, "Finite Element Simulation of Earthquake Ground Motion in Realistic
Basins," February 1998 (co-advised with J. Bielak). Currently at Algor,
Inc., Pittsburgh, PA.
Biros, "Parallel Algorithms for PDE-Constrained Optimization, with
Applications to Optimal Flow Control," September 2000. Currently
assistant professor, Mechanical Engineering & Applied Mechanics and
Computer Science, University of Pennsylvania.
Malcevic, "A Parallel Dynamic Mesh Lagrangian Method for
Navier Stokes Flows with Deformable Boundaries," May 2001. Currently
member of the technical staff, Engineering Mechanics Laboratory,
General Electric Company, Niskayuna, NY.
Akcelik, "Multiscale Newton-Krylov methods for inverse acoustic
wave propagation," February 2002
(co-advised with Branko Jaramaz). Currently research scientist,
Stanford Linear Accelerator Center.
Eui Joong Kim, Parallel
octree-based multi-resolution mesh method for large-scale earthquake
ground motion simulation, May 2003. (co-advised with Jacobo
Bielak). Currently postdoc, Duke University.
Goldmints , Patient-Specific Biomechanical Modeling in
Pre-operative Surgical Planning, May 2003 (co-advised with Branko
Jaramaz). Currently postdoc, RPI.
Judy Hill, Eulerian phase
field methods for flows with elastic membranes, May 2004 (co-advised
with Noel Walkington). Currently member of technical staff,
Sandia National Labs.
Clemens Kadow, Parallel Delaunay
refinement mesh generation, May 2004 (co-advised with Noel
Walkington, Guy Blelloch, and Gary Miller). Currently with McKinsey &
A Fully Eulerian Method for Shape Optimization with Application to
Navier Stokes Flows, September 2004. Currently postdoc,
Identification of Elastic Basin Properties by Large-scale Inverse
Earthquake Wave Propagation, September 2004 (co-advised with Jacobo
Bielak). Currently consultant, Greece.
Ioanna Pagani, Mechanics of red blood
cell membranes, January 2006 (co-advised with Phil LeDuc). Currently,
postdoc, UC Berkeley.
Inverse viscoelastic wave propagation
(co-advised with Jacobo Bielak)