Christopher Siefert

Scalable Algorithms

Author profile picture

Scalable Algorithms

csiefer@sandia.gov

(505) 844-4696

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1322

Biography

Chris Siefert is a Senior R&D Staff Member in the Computational Multiphysics group at Sandia National Laboratories. His research interests include preconditioners and linear solvers, algebraic multigrid, extended finite elements (XFEM) and discretization techniques for computational electromagnetics. Chris is a member of the Trilinos team and works on MueLu/ML, Ifpack2/Ifpack and Tpetra/Epetra. He is also a member of the ALEGRA team.

Chris’ main Sandia website can be found at: www.sandia.gov/-csiefer/

Education

  • Ph.D., Computer Science w/ Computational Science and Engineering Option, University of Illinois at Urbana-Champaign, 2006.
  • B.S., Computer Science and Mathematics, College of William and Mary, 2000.

Publications

Christopher Siefert, Stephen Lecler Olivier, Gwendolyn Renae Voskuilen, Jeffrey Young, (2022). MultiGrid on FPGA Using Data Parallel C++ 23rd IEEE International Workshop on Parallel and Distributed Scientific and Engineering Computing (PDSEC 2022) Document ID: 1539448

Christopher Siefert, Stephen Lecler Olivier, Gwendolyn Renae Voskuilen, Jeffrey Young, (2022). MultiGrid on FPGA Using Data Parallel C++ PDSEC 2022 Workshop Document ID: 1539220

Raymond S. Tuminaro, Jonathan J. Hu, Christopher Siefert, (2022). Smoothed Aggregation for Difficult Stretched Mesh and Coefficient Variation Problems 17th Copper Mountain Conference On Iterative Methods Document ID: 1493878

Nicholas S. Moore (Texas Tech University), Eric Christopher Cyr, Christopher Siefert, (2022). Learning an Algebriac Multrigrid Interpolation Operator Using a Modified GraphNet Architecture https://www.osti.gov/search/identifier:1859673 Document ID: 1482370

Christopher Siefert, Stephen Lecler Olivier, Gwendolyn Renae Voskuilen, Jeffrey-ex Young, (2022). MultiGrid on FPGA Using Data Parallel C++ 23rd IEEE International Workshop on Parallel and Distributed Scientific and Engineering Computing (PDSEC 2022) Document ID: 1482585

Christopher Siefert, Clayton Hughes, Nicholas Miller, Stephen Lecler Olivier, Gwendolyn Renae Voskuilen, (2022). Solving Sparse Linear Systems on FPGAs using oneAPI SIAM Conference on Parallel Processing for Scientific Computing (PP22) Document ID: 1470101

John Henry Judah Niederhaus, Steven W. Bova, James Brian Carleton, John H. Carpenter, Kyle Cochrane, Wen Dong, Timothy Jesse Fuller, Brian Neal Granzow, Daniel Alejandro Ibanez-Granados, Stephen Ray Kennon, Christopher Bernard Luchini, Ramon Jules Moral, Christopher John O’Brien, Michael Powell, Allen C. Robinson, Jason James Sanchez, Christopher Siefert, Irina Kalashnikova Tezaur, Thomas E. Voth, Michael Meyers Crockatt, Angel Eliud Rodriguez, Alan K. Stagg, (2022). ALEGRA: finite element modeling for multimaterial shock hydrodynamics and multiphysics 16th Hypervelocity Impact Symposium Document ID: 1404955

Adam Michael Steiner, Christopher Siefert, Gabriel A. Shipley, Erica Marie Redline, Sara Dickens, Rex Jaramillo, Tom Chavez, Brian Thomas Hutsel, Gregory Charles Frye-Mason, Kyle John Peterson, Kate Suzanne Bell, Shuaib Balogun, Mark Losego, Torin Sammeth, Ian Kern, Cameron Harjes, Mark Allen Gilmore, Jane Lehr, (2021). Investigating Volumetric Inclusions of Semiconductor Materials to Improve Flashover Resistance in Dielectrics 23rd IEEE Pulsed Power Conference Document ID: 1403405

Christopher Siefert, Timothy Andrew Smith, Elliott Marshall Ridgway, (2021). Evaluation of Programming Language-Aware Diffs for Improving Developer Productivity https://www.osti.gov/search/identifier:1832300 Document ID: 1381169

Adam Michael Steiner, Christopher Siefert, Gabriel A. Shipley, Rex Jaramillo, Tom Chavez, Brian Thomas Hutsel, Erica Marie Redline, Gregory Charles Frye-Mason, Kyle John Peterson, Kate Suzanne Bell, Shuaib Balogun, Mark D. Losego, Torin M. Sammeth, Ian Kern, Cameron D. Harjes, Mark Allen Gilmore, Jane M. Lehr, (2021). Investigating Volumetric Inclusions of Semiconductor Materials to Improve Flashover Resistance in Dielectrics 23rd IEEE Pulsed Power Conference Document ID: 1330086

Christopher Siefert, Raymond S. Tuminaro, Christian Alexander Glusa, John Kaushagen, (2021). Multilevel Methods for Maxwell’s Equations SIAM Conference on Applied Linear Algebra (LA21) https://www.osti.gov/search/identifier:1869378 Document ID: 1307097

Karen D. Devine, Geoffrey C Danielson, Timothy Jesse Fuller, Jonathan J. Hu, Brian Michael Kelley, Kyungjoo Kim, Christopher Siefert, Timothy Andrew Smith, (2021). Removal of the UVM Requirement from Tpetra: MultiVector and BlockMultiVector Tpetra training for stakeholders https://www.osti.gov/search/identifier:1854709 Document ID: 1280757

Luc Berger-Vergiat, Jonathan J. Hu, Christian Alexander Glusa, Christopher Siefert, (2021). Portability of Nalu-Wind using Trilinos and Kokkos Libraries Siam Cse https://www.osti.gov/search/identifier:1854321 Document ID: 1280430

Christopher Siefert, (2021). A Cut-Based Coarsening Algorithm for Smoothed Aggregation Algebraic Multigrid SIAM Converence on Computational Science and Engineering (CSE21) https://www.osti.gov/search/identifier:1847463 Document ID: 1279758

Eduardo A. Padilla, Christopher Siefert, Kyle James Weinfurther, Ryan James Kamm, (2021). AI-based Intrinsically Secure Information Barrier for Arms Control Verification INMM/ESARDA Annual Meeting Document ID: 1269102

Angel Eliud Rodriguez, Christopher Siefert, John Henry Judah Niederhaus, (2020). Resistive heating in an electrified domain with a spherical inclusion: an ALEGRA verification study https://www.osti.gov/search/identifier:1670528 Document ID: 1197439

John Henry Judah Niederhaus, Jose L Pacheco, John Wilkes, Russell Hooper, Christopher Siefert, Ronald S. Goeke, (2020). Modeling a ring magnet in ALEGRA https://www.osti.gov/search/identifier:1668139 Document ID: 1196307

Christopher Siefert, James John Elliott, (2020). Case Study: Debugging Other People?s Libraries via PRELOAD 2020 Collegeville Workshop on Scientific Software https://www.osti.gov/search/identifier:1807408 Document ID: 1140003

Christopher Siefert, (2020). Avatar Tools v.1.2 Document ID: 1115160

Christopher Siefert, (2020). Adding Magnetization to the Eddy Current Approximation of Maxwell’s Equations https://www.osti.gov/search/identifier:1614896 Document ID: 1115470

Luc Berger-Vergiat, Jonathan J. Hu, Raymond S. Tuminaro, Christopher Siefert, Christian Alexander Glusa, (2020). MueLu’s Algorithmic Performance on GPU SIAM Parallel Processing https://www.osti.gov/search/identifier:1766725 Document ID: 1092329

Jonathan J. Hu, Christian Alexander Glusa, Stan Gerald Moore, Paul Lin, Edward Geoffrey Phillips, Matthew Tyler Bettencourt, James John Elliott, Christopher Siefert, Sivasankaran Rajamanickam, (2020). Linear Solvers for Plasma Simulations on Advanced Architectures SIAM Parallel Processing https://www.osti.gov/search/identifier:1765804 Document ID: 1091938

Christopher Siefert, Karen D. Devine, Mark Frederick Hoemmen, Jonathan J. Hu, Brian Michael Kelley, (2020). State of the Tpetra Linear Solver Stack State of the Tpetra Linear Solver Stack https://www.osti.gov/search/identifier:1764665 Document ID: 1091365

Raymond S. Tuminaro, Luc Berger-Vergiat, Christopher Siefert, Mike, Brazell, Dimitri Mavriplis, (2019). Algebraic Multigrid for Highly Convective Flow Simulations Stanford University seminar https://www.osti.gov/search/identifier:1643436 Document ID: 1067443

Raymond S. Tuminaro, John N. Shadid, Eric Christopher Cyr, Paul Lin, Roger P. Pawlowski, Edward Geoffrey Phillips, Tobias Wiesner, James Adler, Tom Benson, Luis Chacon, Patrick Farrell, Ari Rappaport, Scott Maclachlan, Jonathan J. Hu, Luc Berger-Vergiat, Christian Alexander Glusa, Christopher Siefert, (2019). Scalable Preconditioners to Improve Time to Solution for Magnetohydrodynamics Applications Computer Science and Information Science External Review Board https://www.osti.gov/search/identifier:1645823 Document ID: 998732

Christopher Siefert, (2019). Machine Learning for Linear Solvers Sandia Machine Learning and Deep Learning Workshop https://www.osti.gov/search/identifier:1641458 Document ID: 997505

Timothy Jesse Fuller, Mark Frederick Hoemmen, William C. McLendon, Christopher Siefert, (2019). Performance in Matrix Assembly Using Trilinos 15th US National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1641240 Document ID: 986378

Raymond S. Tuminaro, Luc Berger-Vergiat, Travis C. Fisher, Micah Andrew Howard, Christopher Siefert, Mike Brazil, Dimitri x Mavriplis, (2019). Algebraic Multigrid for Hypersonic Simulations Preconditioning 2019 https://www.osti.gov/search/identifier:1640941 Document ID: 984361

Christopher Siefert, (2019). MueLu: Algebraic Multigrid in Trilinos Kokkos User Group Meeing https://www.osti.gov/search/identifier:1644944 Document ID: 959815

Jonathan J. Hu, Christian Alexander Glusa, Paul Lin, Edward Geoffrey Phillips, James John Elliott, Christopher Siefert, Sivasankaran Rajamanickam, (2019). Large Scale Parallel Solution Methods for Electromagnetic Simulations SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1602925 Document ID: 925324

Eric Christopher Cyr, Kristian Beckwith, Christopher Siefert, P. Sentz (UIUC), L. Olson (UIUC), S. Guenther (TU Kaiserslautern), N. R. Gauger (TU Kaiserslautern), L. Ruthotto (Emory), J. B. Schroder (UNM), (2019). Towards Scalable Scientific Machine Learning: Motivation and an Approach SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1602145 Document ID: 925109

Luc Berger-Vergiat, Raymond S. Tuminaro, Jonathan J. Hu, Christopher Siefert, (2019). A multigrid approach to solve hypersonic flow problems Siam Cse 2019 https://www.osti.gov/search/identifier:1602113 Document ID: 925360

Raymond S. Tuminaro, Luc Berger-Vergiat, Jonathan J. Hu, Christopher Siefert, Matthias Mayr, (2019). Non-invasive Semi-Structured Multigrid on Advanced Architectures 2019 ASCR Applied Mathematics Principal Investigators (PI) Meeting https://www.osti.gov/search/identifier:1595908 Document ID: 912935

Raymond S. Tuminaro, Jonathan J. Hu, Christopher Siefert, Luc Berger-Vergiat, Mattias Mayr, (2019). Non-invasive Semi-Structured Multigrid on Advanced Architectures 2019 ASCR Applied Mathematics Principal Investigators (PI) Meeting https://www.osti.gov/search/identifier:1595907 Document ID: 912894

Luc Berger-Vergiat, Christian Alexander Glusa, Jonathan J. Hu, Christopher Siefert, Raymond S. Tuminaro, Mayr Matthias, Prokopenko Andrey, Wiesner Tobias, (2019). MueLu User?s Guide https://www.osti.gov/search/identifier:1491860 Document ID: 902759

Steven J. Owen, Christopher Siefert, Craig Michael Vineyard, Ron A. Oldfield, (2019). SNL Data and Visualization: ML Projects at Sandia Exascale Computing Annual Meeting https://www.osti.gov/search/identifier:1591994 Document ID: 902257

James John Elliott III, Christopher Siefert, (2018). Low Thread-count Gustavson: A multithreaded algorithm for sparse matrix-matrix multiplication using perfect hashing ScalA189th Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems ScalA189th Workshop on Latest Advances in Scalable Algorithm https://www.osti.gov/search/identifier:1574589 Document ID: 889274

Christopher Siefert, James John Elliott, Christopher Bernard Luchini, (2018). Sparse Matrix-Matrix Multiplication: An MPI+X Story UNM Computer Science Department Colloquium https://www.osti.gov/search/identifier:1592666 Document ID: 888169

James John Elliott, Christopher Siefert, (2018). Low Thread-count Gustavson: A multithreaded algorithm for sparse matrix-matrix multiplication using perfect hashing ScalA189th Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems ScalA189th Workshop on Latest Advances in Scalable Algorithm https://www.osti.gov/search/identifier:1594338 Document ID: 876615

Matthew Tyler Bettencourt, Richard Michael Jack Kramer, Keith Cartwright, Edward Geoffrey Phillips, Curtis C. Ober, Roger P. Pawlowski, Matthew Scot Swan, Irina Kalashnikova Tezaur, Eric T. Phipps, Sidafa Conde, Eric Christopher Cyr, Craig D. Ulmer, Todd Henry Kordenbrock, Scott Larson Nicoll Levy, Gary J. Templet, Jonathan J. Hu, Paul Lin, Christian Alexander Glusa, Christopher Siefert, Micheal W. Glass, (2018). ASC ATDM Level 2 Milestone #6358: Assess Status of Next Generation Components and Physics Models in EMPIRE https://www.osti.gov/search/identifier:1493832 Document ID: 854521

Gauthier Becker, Christopher Siefert, Raymond S. Tuminaro, Huafei Sun, Dakshina Valiveti, Aruna Mohan, Jichao Yin, Hao Huang, (2018). High resolution viscous fingering simulation in miscible displacement using a p-adaptive discontinuous Galerkin method with algebraic multigrid preconditioner Journal of Computational Physics https://www.osti.gov/search/identifier:1473935 Document ID: 854100

Christopher Siefert, Richard Michael Jack Kramer, Thomas E. Voth, Pavel B. Bochev, (2018). Formulation and computation of dynamic, interface-compatible Whitney complexes in three dimensions Journal of Computational Physics https://www.osti.gov/search/identifier:1469640 Document ID: 854101

Luc Berger-Vergiat, Jonathan J. Hu, Christopher Siefert, (2018). On node parallel aggregation for AMG SIAM annual meeting https://www.osti.gov/search/identifier:1568997 Document ID: 830323

Christopher Siefert, (2018). Sparse Matrix-Matrix Multiplication and Related Kernels on Knights Landing Siam Annual Meeting 2018 https://www.osti.gov/search/identifier:1529212 Document ID: 809147

Raymond S. Tuminaro, Jonathan J. Hu, Christopher Siefert, Luc Berger-Vergiat, Matthias Mayr, (2018). Leveraging Problem Structure within Multilevel Solvers to Improve Robustness & Performance on Advanced Architectures 2017 ASCR Applied Mathematics Principal Investigators Meeting https://www.osti.gov/search/identifier:1497567 Document ID: 671065

Christopher Siefert, Christopher Bernard Luchini, (2018). Low Communication Neighbor Discovery for Matrix Migration SIAM Conference on Parallel Computing https://www.osti.gov/search/identifier:1497539 Document ID: 761064

James John Elliott, Christopher Siefert, Jonathan J. Hu, (2018). Trilinos Performance on Knights Landing Programming Models and Co-Design (PMCD) Meeting https://www.osti.gov/search/identifier:1495773 Document ID: 760637

Luc Berger-Vergiat, Luc Berger-Vergiat, Michael Joseph Brazell, Michael Joseph Brazell, Christian Alexander Glusa, Christian Alexander Glusa, Jonathan J. Hu, Jonathan J. Hu, Dimitri Mavriplis, Dimitri Mavriplis, Christopher Siefert, Christopher Siefert, Raymond S. Tuminaro, Raymond S. Tuminaro, (2017). MueLu: ATDM work 2017 ASC/ATDM Linear solvers review Document ID: 704117

Christopher Siefert, Logan Meredith, James Brian Carleton, (2017). Verification for Magnetic Materials in MHD Multimat 2017 https://www.osti.gov/search/identifier:1470701 Document ID: 671476

Nathan V. Roberts, James Brian Carleton, Wen Dong, Sharon Petney, Allen C. Robinson, Christopher Siefert, (2017). Ferroelectric Modeling Development Using Trilinos CIS External Review https://www.osti.gov/search/identifier:1508728 Document ID: 660024

Christopher Siefert, Jonathan J. Hu, Nathan V. Roberts, (2017). Towards a More Algebraic hp-Multigrid 18th Copper Mountain Conference On Multigrid Methods https://www.osti.gov/search/identifier:1456438 Document ID: 611090

Jonathan J. Hu, Karen D. Devine, Mark Frederick Hoemmen, Paul Lin, Sivasankaran Rajamanickam, Nathan V. Roberts, Christopher Siefert, Christian Robert Trott, Andrey Prokopenko, (2017). Enabling Low Mach Fluid Simulations Using Trilinos SIAM CS&E https://www.osti.gov/search/identifier:1426612 Document ID: 600032

Christopher Siefert, Logan (University of Rochester) Meredith, Duncan Alisdair Odum McGregor, (2017). Computation of Derived Variables for the Eddy Current Maxwell?s Equations SIAM Conference on Computational Science and Engineering (CSE17) https://www.osti.gov/search/identifier:1505907 Document ID: 579057

Christopher Siefert, John Henry Judah Niederhaus, (2016). Modeling permanent magnets in ALEGRA Third Amnnual DoD/SNL Mod-Sim Workshop https://www.osti.gov/search/identifier:1806986 Document ID: 553487

Raymond S. Tuminaro, Eric Christopher Cyr, John N. Shadid, David R. Noble, Luc Berger-Vergiat, Jonathan J. Hu, Andrey Prokopenko, Christopher Siefert, Tobias Albert Wiesner, Mauro Perego, Andrew G. Salinger, Irina Kalashnikova Tezaur, Stephen Price, (2016). Toward Robust Scalable Algebraic Multigrid Solvers UNM Applied Math & Statistics Seminar https://www.osti.gov/search/identifier:1406967 Document ID: 532614

Christopher Siefert, (2016). Do This, Not That: Import/Export and FillComplete Edition Trilinos User-Developer Group Meeting 2016 https://www.osti.gov/search/identifier:1405227 Document ID: 532355

Christopher Siefert, Brian Michael Kelley, Christopher Bernard Luchini, (2016). Reading YAML into a Teuchos::ParameterList Trilinos User-Developer Group Meeting 2016 https://www.osti.gov/search/identifier:1405228 Document ID: 532356

Robert Doney, Christopher Siefert, John Henry Judah Niederhaus, (2016). Improved Solver Settings for 3D Exploding Wire Simulations in ALEGRA https://www.osti.gov/search/identifier:1562202 Document ID: 528814

Jonathan J. Hu, Christopher Siefert, (2016). Multigrid Methods for Systems Arising from High Order Discretizations SIAM Annual Meeting 2016 https://www.osti.gov/search/identifier:1372208 Document ID: 476580

Christopher Siefert, (2016). Neighbor Discovery for Algebraic Multigrid and Matrix Migration 2016 SIAM Annual Meeting https://www.osti.gov/search/identifier:1368437 Document ID: 475295

Andrey V Prokopenko, Christopher Siefert, Jonathan J. Hu, Mark Frederick Hoemmen, Alicia Marie Klinvex, (2016). Ifpack2 User’s Guide 1.0 https://www.osti.gov/search/identifier:1259544 Document ID: 464173

Christopher Siefert, (2016). Won’t you be my neighbor? A look at neighbor discovery for algebraic multigrid 14th Copper Mountain Conference on Iterative Methods https://www.osti.gov/search/identifier:1422056 Document ID: 419723

Tobias Albert Wiesner, Jonathan J. Hu, Brian Kelley, Christopher Siefert, (2015). A new MATLAB interface to MueLu Trilinos user group meeting 2015 https://www.osti.gov/search/identifier:1331844 Document ID: 343372

Jonathan J. Hu, Christopher Siefert, Pat Plunkett, Paul Atzberger, (2015). Spatially adaptive stochastic methods for fluid?structure interactions subject to thermal fluctuations in domains with complex geometries Journal of Computational Physics https://www.osti.gov/search/identifier:1226084 Document ID: 320486

Christopher Siefert, Jonathan J. Hu, Travis C. Fisher, Stefan P. Domino, (2015). Implicit Solvers for Higher-Order Discretizations 7th Interational Conference on Numerical Methods for Multi-Material Flow (MULTIMAT 2015) https://www.osti.gov/search/identifier:1327223 Document ID: 320533

Christopher Siefert, Brian Kelley, (2015). MueMex User’s Guide https://www.osti.gov/search/identifier:1212251 Document ID: 319904

Christopher Siefert, Raymond S. Tuminaro, Gauthier Becker, Huafei Sun, Jichao Yin, Hao Huang, (2015). Linear solver strategy for coupled and implicit discontinuous Galerkin method to model miscible displacement with adverse mobility ratio 13th U.S. National Congress on Computational Mechanics (USNCCM13) https://www.osti.gov/search/identifier:1513572 Document ID: 308344

Richard Michael Jack Kramer, Christopher Siefert, Thomas E. Voth, (2015). Constrained Interpolation Remap for Interface-Capturing Finite Element Methods Applied to Multi-Material Electromagnetics 13th US National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1261581 Document ID: 307760

John Henry Judah Niederhaus, Christopher Siefert, Sharon Petney, (2015). Discussion of the Aztec/ML solver for transient magnetics ALEGRA User Meeting https://www.osti.gov/search/identifier:1255047 Document ID: 285948

Grey Ballard, Jonathan J. Hu, Christopher Siefert, (2015). Reducing Communication Costs for Sparse Matrix Multiplication within Algebraic Multigrid https://www.osti.gov/search/identifier:1504845 Document ID: 264373

Grey Ballard, Jonathan J. Hu, Christopher Siefert, (2015). Reducing Communication Costs for Sparse Matrix Multiplication within Algebraic Multigrid SIAM Conference on Scientific Computing and Engineering https://www.osti.gov/search/identifier:1246297 Document ID: 232723

Christopher Siefert, Richard Michael Jack Kramer, Pavel B. Bochev, Thomas E. Voth, (2015). Extended and Conformal Decomposition Finite Elements for 3D Compatible Discretizations SIAM Conference on Computational Sceince and Engineering (CSE15) https://www.osti.gov/search/identifier:1241271 Document ID: 232193

Jonathan J. Hu, Christopher Siefert, Paul J. Atzberger, Pat Plunkett, (2015). Spatially Adaptive Stochastic Methods for Mesoscopic Fluid-Structure Interactions in Complex Geometries SIAM Conference on Computation Science and Engineering https://www.osti.gov/search/identifier:1241111 Document ID: 232130

Richard Michael Jack Kramer, Christopher Siefert, Thomas E. Voth, (2015). Constrained Interpolation Remap for Interface-Capturing Finite Element Methods Applied to Multi-Material Electromagnetics Usnccm Document ID: 220967

Christopher Siefert, Jonathan J. Hu, John R. (Tech-X) Cary, Benjamin M. (Tech-X) Cowen, (2015). High-performance computational capability for conventional and laser-driven acceleration Scientific Discovery through Advanced Computing (SciDAC)High Energy Physics; LAB 15-1210 Document ID: 219835

Mauro Perego, Kyungjoo Kim, M. Maxey, Wei Pan, Michael L. Parks, N. Trask, Christopher Siefert, (2014). A Parallel Implicit Implementation of Smoothed Paricle Hydrodynamics for Electrokinetic Applications MRS, 2014 Fall Meeting & Exhibit https://www.osti.gov/search/identifier:1315417 Document ID: 218757

Travis C. Fisher, Christopher Siefert, Mark Frederick Hoemmen, Andrey Prokopenko, (2014). Trilinos BlockCRS solver stack in high-order aerodynamics simulations Trilinos User Group Meeting https://www.osti.gov/search/identifier:1503788 Document ID: 197515

Jonathan J. Hu, Andrey V Prokopenko, Tobias A. Wiesner, Christopher Siefert, Raymond S. Tuminaro, (2014). MueLu User’s Guid for Trilinos Version 11.12 https://www.osti.gov/search/identifier:1160320 Document ID: 187226

Richard Michael Jack Kramer, Christopher Siefert, Thomas E. Voth, (2014). Constrained Interpolation Remap for Sub-Cell Resolved Multi-Material Electromagnetics https://www.osti.gov/search/identifier:1576109 Document ID: 166057

Christopher Siefert, Pavel B. Bochev, Richard Michael Jack Kramer, Thomas E. Voth, (2014). Sub-Cell Resolution Techniques for Multi-Material Electromagnetics in Two and Three Dimensions https://www.osti.gov/search/identifier:1241710 Document ID: 166090

Christopher Siefert, Pavel B. Bochev, Richard Michael Jack Kramer, Thomas E. Voth, James Cox, (2014). Electromagnetic Extended Finite Elements for High-Fidelity Multimaterial Problems LDRD Final Report https://www.osti.gov/search/identifier:1322284 Document ID: 155546

Paul Lin, Matthew Tyler Bettencourt, Stefan P. Domino, Travis C. Fisher, Mark Frederick Hoemmen, Jonathan J. Hu, Eric T. Phipps, Andrey V Prokopenko, Sivasankaran Rajamanickam, Christopher Siefert, Kennon, Stephen Ray Kennon, (2014). Towards extreme-scale simulations for low-Mach fluids with second-generation Trilinos Parallel Processing Letters https://www.osti.gov/search/identifier:1182972 Document ID: 132818

Christopher Siefert, Richard Michael Jack Kramer, (2014). Local Smoothers for CDFEM with Sub-Element Discontinuities 2014 SIAM Annual Meeting https://www.osti.gov/search/identifier:1496944 Document ID: 112231

Paul Lin, Matthew Tyler Bettencourt, Stefan P. Domino, Travis C. Fisher, Mark Frederick Hoemmen, Jonathan J. Hu, Eric T. Phipps, Andrey V Prokopenko, Sivasankaran Rajamanickam, Christopher Siefert, Eric Christopher Cyr, (2014). Towards Extreme-scale Simulations with Next-Generation Trilinos: a low Mach application case study 28th IEEE International Parallel & Distributed Processing Symposium https://www.osti.gov/search/identifier:1146105 Document ID: 5336611

Paul Lin, Matthew Tyler Bettencourt, Eric Christopher Cyr, Stefan P. Domino, Travis C. Fisher, Mark Frederick Hoemmen, Jonathan J. Hu, Eric T. Phipps, Andrey V Prokopenko, Sivasankaran Rajamanickam, Christopher Siefert, (2013). Enabling extreme-scale simulations with next-generation Trilinos for Sierra low Mach fluid application code IEEE International Parallel & Distributed Processing Symposium (IPDPS) https://www.osti.gov/search/identifier:1121283 Document ID: 5329442

Allen C. Robinson, Otto Erik Strack, William J. Rider, John Walter, Kristi Brislawn, Edward Love, Thomas E. Voth, Stewart John Mosso, John Henry Judah Niederhaus, Sharon Petney, Richard R. Drake, V. Gregory Weirs, Brian M. Adams, Dena Vigil, John H. Carpenter, Christopher J. Garasi, Michael K. Wong, Joshua Robbins, Christopher Siefert, Ann Elisabet Wills, Susan carroll, Duane LaBreche, Chris Kueny, Chris Luchini, Timothy G. Trucano, Pavel B. Bochev, Randall M. Summers, James R. Stewart, Curtis C. Ober, Thomas A. Haill, Raymond W. Lemke, Kyle Cochrane, Michael P. Desjarlais, (2013). ALEGRA Update: Modernization and Resilience Progress Multimat2013 https://www.osti.gov/search/identifier:1115141 Document ID: 5327018

Murat Okandan, Jonathan J. Hu, Andrey V Prokopenko, Christopher Siefert, Paul Hikaru Tsuji, Erik Gunnar Boman, Eric Christopher Cyr, Paul Lin, John N. Shadid, Michael Gee, Tobias Wiesner, Luke Olson, Jacob Schroder, David Keyes, Jeremie Gaidamour, Scott Maclachlan, Tom Benson, Steve Shank, Haim Waisman, Badri Hiriyur, Axel Gerstenberger, (2013). Amoritzing AMG Components Across Problem Sequences 2013 DOE Applied Mathematics PI Meeting https://www.osti.gov/search/identifier:1106439 Document ID: 5326013

Richard Michael Jack Kramer, Pavel B. Bochev, Christopher Siefert, Thomas E. Voth, (2013). An eXtended Finite Element Method with Algebraic Constraints (XFEM-AC) for problems with weak discontinuities Computer Methods in Applied Mechanics and Engineering https://www.osti.gov/search/identifier:1106459 Document ID: 5324993

Murat Okandan, Erik Gunnar Boman, Jonathan J. Hu, Andrey V Prokopenko, Christopher Siefert, Paul Hikaru Tsuji, Jeremie Gaidamour, Luke Olson, Jacob Schroder, Badri Hiriyur, David Keyes, Haim Waisman, (2013). Toward Flexible Scalable Algebraic Multigrid Solvers International Conference On Preconditioning Techniques For Scientific And Industrial Applications https://www.osti.gov/search/identifier:1083708 Document ID: 5323711

Jeremie Gaidamour, Raymond S. Tuminaro, Christopher Siefert, (2012). A General AMG Strategy for Addressing the Near Null-space Based on Energy Minimization The 20th International Conference on Domain Decomposition Methods https://www.osti.gov/search/identifier:1120893 Document ID: 5291437

Roger P. Pawlowski, Eric T. Phipps, Andrew G. Salinger, Steven J. Owen, Christopher Siefert, Matthew L. Staten, (2012). Automating embedded analysis capabilities and managing software complexity in multiphysics simulation part II: application to partial differential equations Scientific Programming https://www.osti.gov/search/identifier:1067824 Document ID: 5308257

Jeremie Gaidamour, Christopher Siefert, Raymond S. Tuminaro, Tobias Wiesner, (2012). MueLu A Flexible, Parallel Multigrid Framework Copper Mountain Conference on Iterative Methods https://www.osti.gov/search/identifier:1117538 Document ID: 5306666

Jeremie Gaidamour, Christopher Siefert, Raymond S. Tuminaro, Axel Gerstenberger, Tobias Wiesner, (2011). MueLu: A Framework for Developing Scalable Multigrid Preconditioners SuperComputing 2011 https://www.osti.gov/search/identifier:1111588 Document ID: 5301833

Roger P. Pawlowski, Eric T. Phipps, Steven J. Owen, Christopher Siefert, Matthew L. Staten, (2011). Applying template-based generic programming to the simulation and analysis of partial differential equations Scientific Programming https://www.osti.gov/search/identifier:1106473 Document ID: 5299872

Jeremie Gaidamour, Jonathan J. Hu, Raymond S. Tuminaro, Christopher Siefert, (2011). MueMat: a MATLAB Toolbox to Experiment with New Multigrid Preconditioners 7th International Congress on Industrial and Applied Mathematics https://www.osti.gov/search/identifier:1140699 Document ID: 5296664

Alan P. Zelicoff, Jeremie Gaidamour, Christopher Siefert, Raymond S. Tuminaro, (2011). Algebraic Multigrid for Systems of PDEs Based on Energy Minimization Principles 11th Internation Congress on Industrial and Applied Mathematics https://www.osti.gov/search/identifier:1140298 Document ID: 5296595

Jeremie Gaidamour, Christopher Siefert, Raymond S. Tuminaro, (2011). Algebraic Multigrid using Energy-Minimization: a general framework to develop intergrid transfer operator International Conference On Preconditioning Techniques For Scientific And Industrial Applications https://www.osti.gov/search/identifier:1106994 Document ID: 5294596

Pavel B. Bochev, Jonathan J. Hu, Christopher Siefert, John N. Shadid, Paul Lin, Howard Elman, Michael Gee, Marzio Sala, Jacob Schroder, Bob Shuttleworth, (2011). Multigrid & Optimal Solvers GeoMath08 https://www.osti.gov/search/identifier:1141620 Document ID: 5265539

Jeremie Gaidamour, Jonathan J. Hu, Christopher Siefert, Raymond S. Tuminaro, (2011). Designing an extensible framework for multigrid algorithm research 15th Copper Mountain Conference on Multigrid Methods https://www.osti.gov/search/identifier:1120626 Document ID: 5293076

Murat Okandan, Jeremie Gaidamour, Axel Gerstenberger, Jonathan J. Hu, Christopher Siefert, Michael Gee, Tobias Wiesner, Badri Hiriyur, David Keyes, Haim Waisman, (2011). Leveraging Flexibility in Energy Minimization Algebraic Multigrid Seminar at Penn. State University https://www.osti.gov/search/identifier:1288862 Document ID: 5292307

Murat Okandan, Jeremie Gaidamour, Axel Gerstenberger, Christopher Siefert, Luke Olson, Jacob Schroder, Michael Gee, Tobias Wiesner, (2011). Krylov Methods and Energy Minimization Algebraic Multigrid Seminar at Penn. State University https://www.osti.gov/search/identifier:1109204 Document ID: 5292236

Stuart L. Kupferman, Steven J. Owen, Roger P. Pawlowski, Eric T. Phipps, Christopher Siefert, Matthew L. Staten, (2011). Building a PDE with Componenets, including shape optimization and embedded UQ SIAM Computational Science and Engineering https://www.osti.gov/search/identifier:1109209 Document ID: 5292091

Murat Okandan, Jonathan J. Hu, Jeremie Gaidamour, Christopher Siefert, Axel Gerstenberger, David Keyes, Haim Waisman, Luke Olson, Jacob Schroder, Badri Hiriyur, Michael Gee, Tobias Wiesner, (2010). A Flexible AMG Framework Centered on Energy Minimization IMA WorkshopNumerical Solution of Partial Differential EquationsSolution Techniques https://www.osti.gov/search/identifier:1035650 Document ID: 5289662

Murat Okandan, Christopher Siefert, Jonathan J. Hu, Jeremie Gaidamour, Luke Olson, Jacob Schroder, Haim Waisman, Badri Hiriyur, (2010). Toward Robust Scalable Algebraic Multigrid Solvers seminar at Columbia University https://www.osti.gov/search/identifier:1028459 Document ID: 5288055

Jay V. Verkuilen, Buddy L. Peyton, Christopher Siefert, Alecia Santuzzi, (2010). The Statistical Theory of the List Experiment/Item Count Technique to Measure Socially Sensitive AttitudesSocially Sensitive Attitudes Psychometrika https://www.osti.gov/search/identifier:1124232 Document ID: 5281703

Kate Evans, Wilbert Weijer, Jonas Thies, Andrew G. Salinger, Christopher Siefert, Hung Dinh Nong, (2010). Scalable Climate Simulations using Trilinos Solvers SIAM Parallel Processing https://www.osti.gov/search/identifier:984094 Document ID: 5280036

Allen C. Robinson, Christopher Siefert, Michael P. Desjarlais, (2009). ALEGRA Advanced Training Course ALEGRA Advanced Training Course Document ID: 5275000

Allen C. Robinson, Stewart John Mosso, Christopher Siefert, Jonathan J. Hu, Thomas Anthony Gardiner, Joseph Emmanuel Crepeau, (2009). Consequences for scalability arising from multi-material modelingmulti-material modeling Numerical methods for multi-material fluid flows https://www.osti.gov/search/identifier:1266907 Document ID: 5255492

Murat Okandan, Jonathan J. Hu, Christopher Siefert, (2009). Multilevel Project Presentation for DOE/ASCR visit to Sandia https://www.osti.gov/search/identifier:1698386 Document ID: 5268301

Murat Okandan, Christopher Siefert, Pavel B. Bochev, Yunrong Zhu, Jinchao Xu, (2007). Compatible Gauge Approaches for H(div) Equations https://www.osti.gov/search/identifier:1721468 Document ID: 5255027

Murat Okandan, Pavel B. Bochev, Christopher Siefert, Jonathan J. Hu, (2007). Algebraic Multigrid & Algebraic Reformulation of the Eddy Current Equation 6th International Congress on Industrial and Applied Mathematics https://www.osti.gov/search/identifier:1721468 Document ID: 5253562

Murat Okandan, Jonathan J. Hu, Christopher Siefert, Michael W. Gee, Marzio G. Sala, (2006). Generalizing Smoothed Aggregation on Algebraic Multigrid Workshop on High-Performance Computing https://www.osti.gov/search/identifier:1725736 Document ID: 5245436

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Projects

Alegra
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Awards & Recognition

2013

Christopher Siefert, Chair of the SIAM Professional Development Working Group, SIAM, January 1, 2013