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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

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

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

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

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

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

2016

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

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

2015

OpenACC acceleration of the Nek5000 spectral element code

Markidis, S., Gong, J., Schliephake, M., Laure, E., Hart, A., Henty, D., Heisey, K. & Fischer, P., Aug 28 2015, In : International Journal of High Performance Computing Applications. 29, 3, p. 311-319 9 p.

Research output: Contribution to journalArticle

2014

Accurate prediction of the wall shear stress in rod bundles with the spectral element method at high Reynolds numbers

Walker, J., Merzari, E., Obabko, A., Fischer, P. & Siegel, A., Dec 1 2014, In : International Journal of Heat and Fluid Flow. 50, p. 287-299 13 p.

Research output: Contribution to journalArticle

Aspect ratio effects in turbulent duct flows studied through direct numerical simulation

Vinuesa, R., Noorani, A., Lozano-Durán, A., Khoury, G. K. E., Schlatter, P., Fischer, P. & Nagib, H. M., Oct 3 2014, In : Journal of Turbulence. 15, 10, p. 677-706 30 p.

Research output: Contribution to journalArticle

High-resolution coupled physics solvers for analysing fine-scale nuclear reactor design problems

Mahadevan, V. S., Merzari, E., Tautges, T., Jain, R., Obabko, A., Smith, M. & Fischer, P., Aug 6 2014, In : Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 372, 2021, 20130381.

Research output: Contribution to journalArticle

Legendre spectral element method with nearly incompressible materials

Peet, Y. T. & Fischer, P. F., Jan 1 2014, In : European Journal of Mechanics, A/Solids. 44, p. 91-103 13 p.

Research output: Contribution to journalArticle

2013

Direct numerical simulation of turbulent pipe flow at moderately high reynolds numbers

El Khoury, G. K., Schlatter, P., Noorani, A., Fischer, P. F., Brethouwer, G. & Johansson, A. V., Oct 1 2013, In : Flow, Turbulence and Combustion. 91, 3, p. 475-495 21 p.

Research output: Contribution to journalArticle

Flow and heat transfer characteristics in micro and mini communicating pressure driven channel flows by numerical simulations

Guzmán, A. M., Beiza, M. P., Diaz, A. J., Fischer, P. F. & Ramos, J. C., Jan 7 2013, In : International Journal of Heat and Mass Transfer. 58, 1-2, p. 568-577 10 p.

Research output: Contribution to journalArticle

Hydrodynamic and Longitudinal Impedance Analysis of Cerebrospinal Fluid Dynamics at the Craniovertebral Junction in Type I Chiari Malformation

Martin, B. A., Kalata, W., Shaffer, N., Fischer, P., Luciano, M. & Loth, F., Oct 10 2013, In : PloS one. 8, 10, e75335.

Research output: Contribution to journalArticle

Stabilization of the spectral element method in convection dominated flows by recovery of skew-symmetry

Malm, J., Schlatter, P., Fischer, P. F. & Henningson, D. S., Mar 18 2013, In : Journal of Scientific Computing. 57, 2, p. 254-277 24 p.

Research output: Contribution to journalArticle

2012

Analysis of communication costs for domain decomposed Monte Carlo methods in nuclear reactor analysis

Siegel, A., Smith, K., Fischer, P. & Mahadevan, V., Apr 20 2012, In : Journal of Computational Physics. 231, 8, p. 3119-3125 7 p.

Research output: Contribution to journalArticle

CFD application to oceanic mixed layer sampling with Lagrangian platforms

Özgökmen, T. M. & Fischer, P. F., Jul 1 2012, In : International Journal of Computational Fluid Dynamics. 26, 6-8, p. 337-348 12 p.

Research output: Contribution to journalArticle

Numerical simulation of the flow in wire-wrapped pin bundles: Effect of pin-wire contact modeling

Merzari, E., Pointer, W. D., Smith, J. G., Tentner, A. & Fischer, P., Jan 1 2012, In : Nuclear Engineering and Design. 253, p. 374-386 13 p.

Research output: Contribution to journalArticle

On multi-scale dispersion under the influence of surface mixed layer instabilities and deep flows

Özgökmen, T. M., Poje, A. C., Fischer, P. F., Childs, H., Krishnan, H., Garth, C., Haza, A. C. & Ryan, E., Oct 1 2012, In : Ocean Modelling. 56, p. 16-30 15 p.

Research output: Contribution to journalArticle

Stability analysis of interface temporal discretization in grid overlapping methods

Peet, Y. T. & Fischer, P. F., Dec 1 2012, In : SIAM Journal on Numerical Analysis. 50, 6, p. 3375-3401 27 p.

Research output: Contribution to journalArticle

2011

Direct simulation of turbulent heat transfer in swept flow over a wire in a channel

Ranjan, R., Pantano, C. & Fischer, P., Oct 1 2011, In : International Journal of Heat and Mass Transfer. 54, 21-22, p. 4636-4654 19 p.

Research output: Contribution to journalArticle

Horizontal large eddy simulation of stratified mixing in a lock-exchange system

Berselli, L. C., Fischer, P. F., Iliescu, T. & Özgökmen, T. M., Oct 1 2011, In : Journal of Scientific Computing. 49, 1, p. 3-20 18 p.

Research output: Contribution to journalArticle

Large eddy simulations of mixed layer instabilities and sampling strategies

Özgökmen, T. M., Poje, A. C., Fischer, P. F. & Haza, A. C., Jun 15 2011, In : Ocean Modelling. 39, 3-4, p. 311-331 21 p.

Research output: Contribution to journalArticle

2010

Bridging the Boussinesq and primitive equations through spatio-temporal filtering

Duan, J., Fischer, P., Iliescu, T. & Özgökmen, T. M., Apr 1 2010, In : Applied Mathematics Letters. 23, 4, p. 453-456 4 p.

Research output: Contribution to journalArticle

Direct numerical simulation of separated flow in a three-dimensional diffuser

Ohlsson, J., Schlatter, P., Fischer, P. F. & Henningson, D. S., May 10 2010, In : Journal of Fluid Mechanics. 650, p. 307-318 12 p.

Research output: Contribution to journalArticle

Direct simulation of turbulent swept flow over a wire in a channel

Ranjan, R., Pantano, C. & Fischer, P., May 25 2010, In : Journal of Fluid Mechanics. 651, p. 165-209 45 p.

Research output: Contribution to journalArticle

Polynomial regression approaches using derivative information for uncertainty quantification

Roderick, O., Anitescu, M. & Fischer, P., Feb 2010, In : Nuclear Science and Engineering. 164, 2, p. 122-139 18 p.

Research output: Contribution to journalArticle

2009

A spectral Galerkin method for the coupled Orr-Sommerfeld and induction equations for free-surface MHD

Giannakis, D., Fischer, P. F. & Rosner, R., Mar 1 2009, In : Journal of Computational Physics. 228, 4, p. 1188-1233 46 p.

Research output: Contribution to journalArticle

Forces on a finite-sized particle located close to a wall in a linear shear flow

Zeng, L., Najjar, F., Balachandar, S. & Fischer, P., Jan 1 2009, In : Physics of fluids. 21, 3, 033302.

Research output: Contribution to journalArticle