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Research Output

2020

Direct numerical simulation of rotating ellipsoidal particles using moving nonconforming Schwarz-spectral element method

Mittal, K., Dutta, S. & Fischer, P., Jun 15 2020, In : Computers and Fluids. 205, 104556.

Research output: Contribution to journalArticle

LES of the Gas-Exchange Process Inside an Internal Combustion Engine Using a High-Order Method

Giannakopoulos, G. K., Frouzakis, C. E., Fischer, P. F., Tomboulides, A. G. & Boulouchos, K., Mar 1 2020, In : Flow, Turbulence and Combustion. 104, 2-3, p. 673-692 20 p.

Research output: Contribution to journalArticle

Non-conforming elements in nek5000: Pressure preconditioning and parallel performance

Peplinski, A., Offermans, N., Fischer, P. F. & Schlatter, P., 2020, Spectral and High Order Methods for Partial Differential Equations ICOSAHOM 2018 - Selected Papers from the ICOSAHOM Conference. Sherwin, S. J., Peiró, J., Vincent, P. E., Moxey, D. & Schwab, C. (eds.). Springer, p. 599-609 11 p. (Lecture Notes in Computational Science and Engineering; vol. 134).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Open Access

Scalability of high-performance PDE solvers

Fischer, P., Min, M., Rathnayake, T., Dutta, S., Kolev, T., Dobrev, V., Camier, J. S., Kronbichler, M., Warburton, T., Świrydowicz, K. & Brown, J., Sep 1 2020, In : International Journal of High Performance Computing Applications. 34, 5, p. 562-586 25 p.

Research output: Contribution to journalArticle

Toward Exascale: Overview of Large Eddy Simulations and Direct Numerical Simulations of Nuclear Reactor Flows with the Spectral Element Method in Nek5000

Merzari, E., Fischer, P., Min, M., Kerkemeier, S., Obabko, A., Shaver, D., Yuan, H., Yu, Y., Martinez, J., Brockmeyer, L., Fick, L., Busco, G., Yildiz, A. & Hassan, Y., 2020, (Accepted/In press) In : Nuclear Technology.

Research output: Contribution to journalArticle

Verification and validation of large eddy simulation with Nek5000 for cold leg mixing benchmark

Lai, J. K., Merzari, E., Hassan, Y. A., Fischer, P. & Marin, O., Mar 2020, In : Nuclear Engineering and Design. 358, 110427.

Research output: Contribution to journalArticle

Wall resolved large eddy simulation of reactor core flows with the spectral element method

Merzari, E., Obabko, A., Fischer, P. & Aufiero, M., Aug 1 2020, In : Nuclear Engineering and Design. 364, 110657.

Research output: Contribution to journalArticle

2019

A Characteristic-Based Spectral Element Method for Moving-Domain Problems

Patel, S., Fischer, P., Min, M. & Tomboulides, A., Apr 1 2019, In : Journal of Scientific Computing. 79, 1, p. 564-592 29 p.

Research output: Contribution to journalArticle

High-Fidelity Simulation of Flow-Induced Vibrations in Helical Steam Generators for Small Modular Reactors

Merzari, E., Yuan, H., Kraus, A., Obabko, A., Fischer, P., Solberg, J., Lee, S., Lai, J., Delgado, M. & Hassan, Y., Jan 2 2019, In : Nuclear Technology. 205, 1-2, p. 33-47 15 p.

Research output: Contribution to journalArticle

Mesh Smoothing for the Spectral Element Method

Mittal, K. & Fischer, P., Feb 15 2019, In : Journal of Scientific Computing. 78, 2, p. 1152-1173 22 p.

Research output: Contribution to journalArticle

Nonconforming Schwarz-spectral element methods for incompressible flow

Mittal, K., Dutta, S. & Fischer, P., Sep 15 2019, In : Computers and Fluids. 191, 104237.

Research output: Contribution to journalArticle

OpenACC acceleration for the PN–PN-2 algorithm in Nek5000

Otero, E., Gong, J., Min, M., Fischer, P., Schlatter, P. & Laure, E., Oct 2019, In : Journal of Parallel and Distributed Computing. 132, p. 69-78 10 p.

Research output: Contribution to journalArticle

Scalable low-order finite element preconditioners for high-order spectral element Poisson solvers

Bello-Maldonado, P. D. & Fischer, P. F., Jan 1 2019, In : SIAM Journal on Scientific Computing. 41, 5, p. S2-S18

Research output: Contribution to journalArticle

Towards adaptive mesh refinement for the spectral element solver Nek5000

Offermans, N., Peplinski, A., Marin, O., Fischer, P. F. & Schlatter, P., 2019, ERCOFTAC Series. Springer, p. 9-15 7 p. (ERCOFTAC Series; vol. 25).

Research output: Chapter in Book/Report/Conference proceedingChapter

Validation of NEK5000 for 37- And 61-pin wire-wrap geometries with conjugate heat transfer

Obabko, A., Merzari, E., Brockmeyer, L., Fischer, P., Sofu, T., Jackson, B., Steer, M., Vaghetto, R. & Hassan, Y. A., Jan 1 2019, p. 2036-2049. 14 p.

Research output: Contribution to conferencePaper

Viscosité artificielle non linéaire pour la méthode des éléments spectraux

Translated title of the contribution: Nonlinear artificial viscosity for spectral element methodsLu, L., Nazarov, M. & Fischer, P., Jul 2019, In : Comptes Rendus Mathematique. 357, 7, p. 646-654 9 p.

Research output: Contribution to journalArticle

2018

A novel numerical treatment of the near-wall regions in the k−ω class of RANS models

Tomboulides, A., Aithal, S. M., Fischer, P. F., Merzari, E., Obabko, A. V. & Shaver, D. R., Aug 2018, In : International Journal of Heat and Fluid Flow. 72, p. 186-199 14 p.

Research output: Contribution to journalArticle

Comparison of experimental and simulation results on interior subchannels of a 61-pin wire-wrapped hexagonal fuel bundle

Goth, N., Jones, P., Nguyen, D. T., Vaghetto, R., Hassan, Y. A., Obabko, A., Merzari, E. & Fischer, P. F., Nov 2018, In : Nuclear Engineering and Design. 338, p. 130-136 7 p.

Research output: Contribution to journalArticle

Direct numerical simulation of transitional flow in a finite length curved pipe

Hashemi, A., Fischer, P. F. & Loth, F., Aug 3 2018, In : Journal of Turbulence. 19, 8, p. 664-682 19 p.

Research output: Contribution to journalArticle

Performance analysis of nek5000 for single-assembly calculations

Merzari, E., Rahaman, R., Fischer, P. & Min, M., Jan 1 2018, Development and Applications in Computational Fluid Dynamics; Industrial and Environmental Applications of Fluid Mechanics; Fluid Measurement and Instrumentation; Cavitation and Phase Change. American Society of Mechanical Engineers (ASME), (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Visualization of the Bulle-Effect at river bifurcations

Dutta, S., Fischer, P., Van Moer, M. W. & Garcia, M. H., Jul 22 2018, Practice and Experience in Advanced Research Computing 2018: Seamless Creativity, PEARC 2018. Association for Computing Machinery, a107. (ACM International Conference Proceeding Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2017

A performance analysis of ensemble averaging for high fidelity turbulence simulations at the strong scaling limit

Makarashvili, V., Merzari, E., Obabko, A., Siegel, A. & Fischer, P., Oct 2017, In : Computer Physics Communications. 219, p. 236-245 10 p.

Research output: Contribution to journalArticle

Comparison of experimental and simulation results on interior subchannel of a 61-pin wire-wrapped hexagonal fuel bundle

Goth, N., Jones, P., Nguyen, D. T., Vaghetto, R., Hassan, Y. A., Obabko, A., Merzari, E. & Fischer, P. F., Jan 1 2017.

Research output: Contribution to conferencePaper

Direct numerical simulation of the flow in the intake pipe of an internal combustion engine

Giannakopoulos, G. K., Frouzakis, C. E., Boulouchos, K., Fischer, P. F. & Tomboulides, A. G., Dec 2017, In : International Journal of Heat and Fluid Flow. 68, p. 257-268 12 p.

Research output: Contribution to journalArticle

Geometry effects on thermal striping in nuclear reactors: POD analysis of large-eddy simulations and experiments

Marin, O., Merzari, E., Obabko, A., Alvarez, A., Lomperski, S. & Fischer, P., Jan 1 2017, Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. American Society of Mechanical Engineers (ASME), (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; vol. 1B-2017).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

High-fidelity simulation of flow-induced vibrations in helical steam generators for small modular reactors

Merzari, E., Yuan, H., Kraus, A., Obabko, A., Fischer, P., Solberg, J., Lee, S., Lai, J., Lee, S. H., Delgado, M. & Hassan, Y., Jan 1 2017.

Research output: Contribution to conferencePaper

Jet stability and wall impingement flow field in a thermal striping experiment

Lomperski, S., Obabko, A., Merzari, E., Fischer, P. & Pointer, W. D., Dec 2017, In : International Journal of Heat and Mass Transfer. 115, p. 1125-1136 12 p.

Research output: Contribution to journalArticle

Large-scale large eddy simulation of nuclear reactor flows: Issues and perspectives

Merzari, E., Obabko, A., Fischer, P., Halford, N., Walker, J., Siegel, A. & Yu, Y., Feb 1 2017, In : Nuclear Engineering and Design. 312, p. 86-98 13 p.

Research output: Contribution to journalArticle

Recent developments in spectral element simulations of moving-domain problems

Fischer, P., Schmitt, M. & Tomboulides, A., Jan 1 2017, Fields Institute Communications. Springer New York LLC, p. 213-244 32 p. (Fields Institute Communications; vol. 79).

Research output: Chapter in Book/Report/Conference proceedingChapter

Why is MPI so slow? Analyzing the fundamental limits in implementing MPI-3.1

Rafenetti, K., Amer, A., Oden, L., Archer, C., Bland, W., Fujita, H., Guo, Y., Janjusic, T., Durnov, D., Blocksome, M., Si, M., Seo, S., Langer, A., Zheng, G., Takagi, M., Cofman, P., Jose, J., Sur, S., Sannikov, A., Oblomov, S. & 8 others, Chuvelev, M., Hatanaka, M., Zhao, X., Fischer, P., Rathnayake, T., Otten, M., Min, M. & Balaji, P., Nov 12 2017, Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017. Association for Computing Machinery, Inc, 62. (Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2016

Accelerating the high-fidelity simulation of turbulence: Ensemble averaging

Makarashvili, V., Merzari, E., Obabko, A., Fischer, P. & Siegel, A., Jan 1 2016, Symposia: Fluid Mechanics (Fundamental Issues and Perspectives; Industrial and Environmental Applications); Multiphase Flow and Systems (Multiscale Methods; Noninvasive Measurements; Numerical Methods; Heat Transfer; Performance); Transport Phenomena (Clean Energy; Mixing; Manufacturing and Materials Processing); Turbulent Flows - Issues and Perspectives; Algorithms and Applications for High Performance CFD Computation; Fluid Power; Fluid Dynamics of Wind Energy; Marine Hydrodynamics. American Society of Mechanical Engineers (ASME), (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; vol. 1B-2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

A high-fidelity approach for the simulation of flow-induced vibration

Merzari, E., Solberg, J., Fischer, P. & Ferencz, R. M., Jan 1 2016, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES and Hybrid RANS/LES Methods; Fluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Active Fluid Dynamics and Flow Control - Theory, Experiments and Implementation. American Society of Mechanical Engineers (ASME), (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; vol. 1A-2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

An MPI/OpenACC implementation of a high-order electromagnetics solver with GPUDirect communication

Otten, M., Gong, J., Mametjanov, A., Vose, A., Levesque, J., Fischer, P. & Min, M., Aug 1 2016, In : International Journal of High Performance Computing Applications. 30, 3, p. 320-334 15 p.

Research output: Contribution to journalArticle

A spectrally accurate method for overlapping grid solution of incompressible Navier-Stokes equations

Merrill, B. E., Peet, Y. T., Fischer, P. F. & Lottes, J. W., Feb 15 2016, In : Journal of Computational Physics. 307, p. 60-93 34 p.

Research output: Contribution to journalArticle

Benchmark exercise for fluid flow simulations in a liquid metal fast reactor fuel assembly

Merzari, E., Fischer, P., Yuan, H., Van Tichelen, K., Keijers, S., De Ridder, J., Degroote, J., Vierendeels, J., Doolaard, H., Gopala, V. R. & Roelofs, F., Mar 2016, In : Nuclear Engineering and Design. 298, p. 218-228 11 p.

Research output: Contribution to journalArticle

Large Eddy simulation (LES) of flow and bedload transport at an idealized 90-degree diversion: Insight into Bulle-effect

Dutta, S., Fischer, P. & Garcia, M. H., 2016, River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016. Constantinescu, G., Garcia, M. & Hanes, D. (eds.). CRC Press/Balkema, p. 101-109 9 p. (River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nek5000 large-eddy simulations for thermal-hydraulics of deformed wire-wrap fuel assemblies

Obabko, A. V., Merzari, E. & Fischer, P. F., Jan 1 2016, In : Transactions of the American Nuclear Society. 115, p. 1491-1494 4 p.

Research output: Contribution to journalConference article

Nekbone performance on GPUs with OpenACC and CUDA Fortran implementations

Gong, J., Markidis, S., Laure, E., Otten, M., Fischer, P. & Min, M., Nov 1 2016, In : Journal of Supercomputing. 72, 11, p. 4160-4180 21 p.

Research output: Contribution to journalArticle

On the strong scaling of the spectral element solver Nek5000 on petascale systems

Offermans, N., Marin, O., Schanen, M., Gong, J., Fischer, P. & Schlatter, P., Apr 26 2016, Proceedings of the 2016 Exascale Applications and Software Conference, EASC 2016. Association for Computing Machinery, a5. (ACM International Conference Proceeding Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Outcomes from the DOE workshop on turbulent flow simulation at the exascale

Sprague, M. A., Boldyrev, S., Chang, C. S., Fischer, P., Grout, R., Gustafson, W. I., Hittinger, J. A. F., Merzari, E. & Moser, R., Jan 1 2016, 46th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, (46th AIAA Fluid Dynamics Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Parallel performance of h-type Adaptive Mesh Refinement for Nek5000

Peplinski, A., Fischer, P. F. & Schlatter, P., Apr 26 2016, Proceedings of the 2016 Exascale Applications and Software Conference, EASC 2016. Association for Computing Machinery, a4. (ACM International Conference Proceeding Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2015

Calibration and optimization of pressurized thermal shock for benchmarking direct numerical simulation

Damiani, G., Rosa, D., Shams, A., Komen, E. M. J., Merzari, E., Obabko, A. & Fischer, P., Jan 1 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, p. 4153-4166 14 p. (International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015; vol. 5).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

CFD benchmark for a heavy liquid metal fuel assembly

Doolaard, H. J., Shams, A., Roelofs, F., Van Tichelen, K., Keijers, S., De Ridder, J., Degroote, J., Vierendeels, J., Di Piazza, I., Marinari, R., Merzari, E., Obabko, A. & Fischer, P., Jan 1 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, p. 2196-2208 13 p. (International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015; vol. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches

Kraus, A., Aithal, S., Obabko, A., Merzari, E., Tomboulides, A. & Fischer, P., Jan 1 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, p. 1448-1461 14 p. (International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Evaluation of parallel communication models in Nekbone, a Nek5000 mini-application

Ivanov, I., Gong, J., Akhmetova, D., Peng, I. B., Markidis, S., Laure, E., Machado, R., Rahn, M., Bartsch, V., Hart, A. & Fischer, P., Oct 26 2015, Proceedings - 2015 IEEE International Conference on Cluster Computing, CLUSTER 2015. Institute of Electrical and Electronics Engineers Inc., p. 760-767 8 p. 7307680. (Proceedings - IEEE International Conference on Cluster Computing, ICCC; vol. 2015-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Large-scale simulation of nuclear reactors: Issues and perspectives

Merzari, E., Obabko, A., Fischer, P., Halford, N., Walker, J., Siegel, A. & Yu, Y., Jan 1 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, p. 280-297 18 p. (International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Large-scale simulation of rod bundles: Coherent structure recognition and stability analysis

Merzari, E., Fischer, P. & Walker, J., Jan 1 2015, Symposia. American Society of Mechanical Engineers, (ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Modeling of two-phase flow in a BWR fuel assembly with a highly-scalable CFD code

Tentner, A., Vegendla, P., Obabko, A., Tomboulides, A., Fischer, P., Marin, O. & Merzari, E., Jan 1 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, p. 1966-1979 14 p. (International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015; vol. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nek5000 with OpenACC

Gong, J., Markidis, S., Schliephake, M., Laure, E., Henningson, D., Schlatter, P., Peplinski, A., Hart, A., Doleschal, J., Henty, D. & Fischer, P., Jan 1 2015, Solving Software Challenges for Exascale - International Conference on Exascale Applications and Software, EASC 2014, Revised Selected Papers. Markidis, S. & Laure, E. (eds.). Springer-Verlag, p. 57-68 12 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 8759).

Research output: Chapter in Book/Report/Conference proceedingConference contribution