## Publications and Outreach

### CEED Documents

- CEED's high-order Benchmarks and Miniapps.
- Activities in the Applications, Hardware, Software and Finite Element thrusts.
- CEED-proposed high-order Operator and Visualization formats.

### Publications

#### 2018

- J. Ceverny, V. Dobrev, and Tz. Kolev, Non-Conforming Mesh Refinement For High-Order Finite Elements, submitted,
**2018**. - A. Karakus, N. Chalmers, J.S. Hesthaven and T. Warburton, Discontinuous Galerkin Discretizations of the Boltzmann Equations in 2D: semi-analytic time stepping and absorbing boundary layers, submitted,
**2018**. - V. Dobrev, P. Knupp, Tz. Kolev, and V. Tomov, Towards Simulation-Driven Optimization of High-Order Meshes by the Target-Matrix Optimization Paradigm,
*27th International Meshing Roundtable, Oct 1-8, 2018, Albuquerque*, submitted,**2018**. - A. Haidar, S. Tomov, and J. Dongarra, Optimizing GPU Kernels for Irregular Batch Workloads: A Case Study for Cholesky Factorization, HPEC'18, submitted,
**2018**. - A. Karakus, N. Chalmers, K. Swirydowicz, T. Warburton, GPU Acceleration of a High-Order Discontinuous Galerkin Incompressible Flow Solver, submitted,
**2018**. - V. Dobrev, P. Knupp, Tz. Kolev, K. Mittal, V. Tomov, The Target-Matrix Optimization Paradigm for High-Order Meshes, in review,
**2018**. - A. Barker, V. Dobrev, J. Gopalakrishnan and T. Kolev, A scalable preconditioner for a primal discontinuous Petrov-Galerkin method,
*SIAM J. Sci. Comp.*, 40(1), pp. B32-B58,**2018**. - R. Anderson, V. Dobrev, Tz. Kolev, R. Rieben and V. Tomov, High-Order Multi-Material ALE Hydrodynamics,
*SIAM J. Sci. Comp.*, 40(1):B32-B58,**2018**. - V. Dobrev, Tz. Kolev, D. Kuzmin, R. Rieben and V. Tomov, Sequential limiting in continuous and discontinuous Galerkin methods for the Euler equations, Journal of Computational Physics,
356:372-390,
**2018**.

#### 2017

- K. Swirydowicz, N. Chalmers, A. Karakus, T. Warburton, Acceleration of tensor-product operations for high-order finite element methods, submitted,
**2017** - J. Solberg, E. Merzari, H. Yuan, A. Obabko and P. Fischer, S. Lee, J. Lai, M. Delgado, S. J. Lee, and Y. Hassan, High-Fidelity Simulation of Flow Induced Vibrations in Helical Steam Generators for Small Modular Reactors,
**Best Paper Award**at*The 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17)*, September,**2017**. - V. Dobrev, Tz. Kolev, C. Lee, V. Tomov and P. Vassilevski, Algebraic Hybridization and Static Condensation with Application to Scalable H(div) Preconditioning, submitted,
**2017**. - S. Patel, P. Fisher, M. Min, and A. Tomboulides, A Characteristic-based, spectral element method for moving-domain problems,
*J. Sci. Comp.*, submitted,**2017**. - I. Masliah, A. Abdelfattah, A. Haidar, S. Tomov, M. Baboulin, J. Falcou, and J. Dongarra, Algorithms and optimization techniques for high-performance matrix-matrix multiplications of very small matrices,
*Parallel Computing (PARCO)*, submitted,**2017**. - K. Raffenetti et. al, P. Fischer, M. Min, and P. Balaji, Why is MPI so slow? Analyzing the fundamental limits in implementing MPI-3.1, accepted,
*SC'17*,**2017**. - P. Fischer, M. Schmitt, and A. Tomboulides, Recent developments in spectral element simulations of moving-domain problems, vol. 79,
*Fields Institute Communications*, 213–244,**2017**. - S. Lomperski, A. Obabko, P. Fischer, E. Merzari, and W.D. Pointer, Jet stability and wall impingement flow field in a thermal striping experiment,
*Int. J. Heat Mass Transfer*, 115A:1125– 1136,**2017**. - V. Makarashvilia, E. Merzari, A. Obabko, A. Siegel, and P. Fischer, A performance analysis of ensemble averaging for high fidelity turbulence simulations at the strong scaling limit,
*Comp. Phys. Comm.*, in press,**2017**. - A. Abdelfattah, A. Haidar, S. Tomov, J. Dongarra, Factorization and Inversion of a Million Matrices using GPUs: Challenges and Countermeasures,
*Proceedings of the 2017 International Conference on Computational Science, ICCS'17*, Zürich, Switzerland, June 12-14,*Procedia Computer Science*,**2017**. - A. Abdelfattah, M. Baboulin, V. Dobrev, J. Dongarra, A. Haidar, I. Karlin, Tz. Kolev, I. Masliah, and S. Tomov, Small Tensor Operations on Advanced Architectures for High-order Applications, Technical report UT-EECS-17-749, EECS Department, University of Tennessee,
**2017**. - R. Anderson, V. Dobrev, Tz. Kolev, D. Kuzmin, M. Quezada de Luna, R. Rieben and V. Tomov,
High-order local maximum principle preserving (MPP) discontinuous Galerkin finite element method for the transport equation, Journal of Computational Physics, 334:102–124,
**2017**. - Bazilevs, Y., Kamran, K., Moutsanidis, G., Benson, D. J., & Oñate, E, A new formulation for air-blast fluid–structure interaction using an immersed approach. Part I: basic methodology and FEM-based simulations, Computational Mechanics, 1-18,
**2017**. - Abdelfattah, A., Haidar, A., Tomov, S., and Dongarra, J. Novel HPC Techniques to Batch Execution of Many Variable Size BLAS Computations on GPUs, International Conference on Supercomputing (ICS'17), ACM, Chicago, Illinois, pp. 1-10, June 14-16,
**2017**. - Ibanez, D., Shephard, M.S., Modifiable Array Data Structures for Mesh Topology, SIAM Journal on Scientific Computing, 39(2):C144-C161,
**2017**. - Granzow, B.N., Shephard M.S., Oberai, A.A., Output-based error estimation and mesh adaptation for variational multiscale methods,
Computer Methods in Applied Mechanics and Engineering, Vol. 322, pp. 441-459,
**2017**.

#### 2016

- E. Merzari, A. Obabko, P. Fischer, N. Halford, J. Walker, A. Siegel, and Y. Q. Yu, Large-scale large eddy simulation of nuclear reactor flows: Issues and perspectives,
*Nuclear Engineering and Design*, page 13, Oct.,**2016**. - E. Merzari, P. Fischer, H. Yuan, K. Van Tichelen, S. Keijers, J. De Ridder, J. Degroote, J. Vierendeels, H. Doolaard, V. R. Gopala, and F. Roelofs, Benchmark exercise for fluid flow simulations in a liquid metal fast reactor fuel assembly,
*Nuclear Engineering and Design*, 298(3):218–228,**2016**. - V. Dobrev, Tz. Kolev, R. Rieben and V. Tomov, Multi-material closure model for high-order finite element Lagrangian hydrodynamics,
*Int. J. Numer. Meth. Fluids*, 82(10), pp. 689–706,**2016**. - A. Abdelfattah, M. Baboulin, V. Dobrev, J. Dongarra, C. Earl, J. Falcou, A. Haidar, I. Karlin, Tz. Kolev, I. Masliah, S. Tomov, High-performance Tensor Contractions for GPUs,
*Procedia Computer Science*, Volume 80, Pages 108-118, ISSN 1877-0509,**2016**. - M. B.E., Y. Peet, P. Fischer, and J. Lottes, A spectrally accurate method for overlapping grid solution of incompressible Navier-Stokes equations,
*J. Comp. Phys.*, 307:60–93,**2016**. - M. Otten, J. Gong, A. Mametjanov, A. Vose, J. Levesque, P. Fischer, and M. Min, An MPI/OpenACC implementation of a high order electromagnetics solver with GPUDirect communication,
*The International Journal of High Performance Computing Application*, 30(3):320–334,**2016**. - J. Gong, S. Markidis, E. Laure, M. Otten, P. Fischer, M. Min, Nekbone Performance on GPUs with OpenACC and CUDA Fortran Implementations,
*Special issue on Sustainability on Ultrascale Computing Systems and Applications: Journal of Supercomputing*,**2016**. - Ibanez, Daniel A., et al. PUMI: Parallel unstructured mesh infrastructure. ACM Transactions on Mathematical Software (TOMS) 42.3
**2016**. - Smith, Cameron W., et al. In-memory Integration of Existing Software Components for Parallel Adaptive Unstructured Mesh Workflows. Proceedings of the XSEDE16 Conference on Diversity, Big Data, and Science at Scale. ACM,
**2016**. - Ibanez, D., Dunn, I., Shephard M.S., Hybrid MPI-thread parallelization of adaptive mesh operations, Parallel Computing, 52:133-143,
**2016**.

#### 2015 and earlier

- P. Fischer, K. Heisey, and M. Min, Scaling limits for PDE-based simulation,
*In 22nd AIAA Computational Fluid Dynamics Conference, AIAA Aviation*, AIAA 2015-3049,**2015**. - A. Kraus, S. Aithal, A. Obabko, E. Merzari, A. Tomboulides, and P. Fischer, Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches, volume 2, pp. 1448–1461.
*American Nuclear Society*,**2015**. - E. Merzari, P. Fischer, and J. Walker, Large-scale simulation of rod bundles: Coherent structure recognition and stability analysis, volume 1.
*American Society of Mechanical Engineers*,**2015**. - M. Otten, R. A. Shah, N. F. Scherer, M. Min, M. Pelton, and S. K. Gray, Entanglement of two, three and four plasmonically coupled quantum dots,
*Physical Review B*, 92:125432,**2015**. - D. A. May, J. Brown, and L. Le Pourhiet. pTatin3D: High-performance methods for long-term lithospheric dynamics, In Proceedings of
*SC14: International Conference for High Performance Computing, Networking, Storage and Analysis*. ACM,**2014**. - R. Anderson, V. Dobrev, Tz. Kolev and R. Rieben, Monotonicity in high-order curvilinear finite element ALE remap,
*Int. J. Numer. Meth. Fluids*, 77(5), pp. 249–273,**2014**. - Kamran, Kazem, et al. A compressible Lagrangian framework for modeling the fluid–structure interaction in the underwater implosion of an aluminum cylinder. Mathematical Models and Methods in Applied Sciences 23.02
**2013**. - Tz. Kolev and P. Vassilevski, Parallel auxiliary space AMG solver for H(div) problems,
*SIAM J. Sci. Comp.*, 34, pp. A3079–A3098,**2012**. - V. Dobrev, Tz. Kolev and R. Rieben, High-order curvilinear finite element methods for Lagrangian hydrodynamics,
*SIAM J. Sci. Comp.*, 34, pp. B606–B641,**2012**. - J. Brown, Efficient nonlinear solvers for nodal high-order finite elements in 3D,
*Journal of Scientific Computing*, 45:48–63,**2010**. doi:10.1007/s10915-010-9396-8 - Tz. Kolev and P. Vassilevski, Parallel auxiliary space AMG for H(curl) problems,
*J. Comput. Math.*, 27, pp. 604-623,**2009**.

### Presentations

#### 2017

- Tz. Kolev and M. Shephard, Conforming & Nonconforming Adaptivity for Unstructured Meshes, Argonne Training Program on Extreme-Scale Computing, Aug 7,
**2017**. - Tz. Kolev and M. Shephard, Unstructured Mesh Technologies, Argonne Training Program on Extreme-Scale Computing, Aug 7,
**2017**. - B. Smith, Nonlinear and Krylov Solvers, Argonne Training Program on Extreme-Scale Computing, Aug 7,
**2017**. - J. Dongarra, Adaptive Linear Solvers and Eigensolvers, Argonne Training Program on Extreme-Scale Computing, Aug 7,
**2017**. - T. Warburton, An Intro to GPU Architecture and Programming Models, Argonne Training Program on Extreme-Scale Computing, Aug 3,
**2017**. - S. Parker, Architectures of the Argonne Cray XC40 KNL System "Theta", Argonne Training Program on Extreme-Scale Computing, Jul 31,
**2017**. - S. Tomov and A. Haidar, MAGMA Tensors and Batched Computing for Accelerating Applications on GPUs, GPU Technology Conference (GTC'17), Session S7728, May 8-11,
**2017**. - A. Abdelfattah, M. Baboulin, V. Dobrev, J. Dongarra, C. Earl, J. Falcou, A. Haidar, I. Karlin, Tz. Kolev, I. Masliah, S. Tomov, Accelerating Tensor Contractions in High-Order FEM with MAGMA Batched,
*SIAM Conference on Computer Science and Engineering (SIAM CSE'17)*, Atlanta, GA, Feb 26-Mar 3,**2017**. - P. Fischer, Efficiency of High-Order Methods on the 2nd Generation Intel Xeon Phi Processor,
*SIAM Conference on Computer Science and Engineering (SIAM CSE'17)*, Atlanta, GA, Feb 26-Mar 3,**2017**. - M. Min, Spectral Element Simulation for Nanowire Solar Cells on HPC Platforms,
*SIAM Conference on Computer Science and Engineering (SIAM CSE'17)*, Atlanta, GA, Feb 26-Mar 3,**2017**. - C. Smith, G. Diamond and M.S. Shephard, Fast Dynamic Load Balancing Tools for Extreme Scale System,
*SIAM Conference on Computer Science and Engineering (SIAM CSE'17)*, Atlanta, GA, Feb 26-Mar 3,**2017**. - S. Tendulkar, O. Klaas, M.W. Beall, and M.S. Shephard, Parallel Geometry and Meshing Adaptation with Application to Problems with Evolving Domains,
*SIAM Conf. on Computational Science and Engineering*, Atlanta, GA, Mar 3,**2017**. - P. Fischer, CFD, PDEs, and HPC: A 30-Year Perspective, Argonne Training Program on Extreme-Scale Computing, Aug 2,
**2016**.

### Highlights

- ECP article: Co-Design is Key to ECP's Holistic Approach to Capable Exascale Computing, Apr 2018.
- MFEM highlighted in LLNL's Science & Technology Review magazine, including on the cover, Jan/Feb 2018.
- GCN article: Exascale a "main priority" for DOE, Jan 2018.
- ECP article: Co-Design Center Develops Next-Generation Simulation Tools, also in HPCwire, Nov 2017.
- Work with LLNL's Center for Design and Optimization mentioned in LLNL Newsline, Oct 2017.
- Highlight in CASC Newsletter #3, Oct 2017.
- Highlight in LLNL’s 65th Anniversary Book (2017 page), Oct 2017.
- GPU work highlight in LLNL's COMP News page and Livermore_Comp's Twitter feed, May 2017.
- Work with Cardioid mentioned in LLNL's Science & Technology Review magazine, Mar 2017.
- News coverage of CEED announcement in LLNL Newsline and the ANL press release, Nov 2016.
- Work with BLAST mentioned in LLNL's Science & Technology Review magazine, Sep 2016.

### Other Resources

- CEED-tagged topics on ECP's website.
- ANL's exascale computing website.
- LLNL's exascale computing website.
- Blog of Virginia Tech's Parallel Numerical Algorithms research group.
- U.S. Department of Energy Exascale Initiative.