Search Results - "Merzari, E."

Analysis of turbulent flow and thermal structures in low-Prandtl number buoyant flows using direct numerical simulations by Bhushan, S., Elmellouki, M., Walters, D.K., Hassan, Y.A., Merzari, E., Obabko, A.

“…•DNS database for low-Pr flows involving mixed aiding and opposing buoyant flow conditions.•Effect of Re, Pr, and buoyancy on the turbulent flow field and…”
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Benchmark exercise for fluid flow simulations in a liquid metal fast reactor fuel assembly by 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.

“…•A EUROTAM-US INERI consortium has performed a benchmark exercise related to fast reactor assembly simulations.•LES calculations for a wire-wrapped rod bundle…”
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Jet stability and wall impingement flow field in a thermal striping experiment by Lomperski, S., Obabko, A., Merzari, E., Fischer, P., Pointer, W.D.

“…[Display omitted] •Measured wall impingement velocity and temperature fields in a jet mixing experiment.•A small change in inlet geometry toggled jets from…”
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Proper orthogonal decomposition of the flow in a tight lattice rod-bundle by Merzari, E., Ninokata, H.

“…▶ A Large Eddy Simulation of the flow in a tight lattice rod bundle has been conducted at two Reynolds numbers. ▶ The flow field has been analyzed through…”
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Assessment of low- and high-fidelity turbulence models for heat transfer predictions in low-prandlt number flows by Bhushan, S., Elmellouki, M., Jamal, T., Busco, G., Walters, D.K., Hassan, Y.A., Merzari, E., Obabko, A.

“…•Comparison of RANS, hybrid RANS/LES and LES model predictions for canonical mixed convective flows.•Comparison of the predictive capability of turbulence…”
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Multiphysics for nuclear energy applications using a cohesive computational framework by Martineau, R., Andrs, D., Carlsen, R., Gaston, D., Hansel, J., Kong, F., Lindsay, A., Permann, C., Slaughter, A., Merzari, E., Hu, Rui, Novak, A., Slaybaugh, R.

“…•INL Multiphysics Object-Oriented Simulation Environment (MOOSE) main design goal is to solve multi-scale, multiphysics problems.•All MOOSE-based software…”
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Numerical simulation of the flow in wire-wrapped pin bundles: Effect of pin-wire contact modeling by Merzari, E., Pointer, W.D., Smith, J.G., Tentner, A., Fischer, P.

“…The rapid advancement of numerical techniques and the availability of increasingly powerful supercomputers recently enabled scientists to use large eddy…”
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Numerical simulation of flows in tight-lattice fuel bundles by Merzari, E., Ninokata, H., Baglietto, E.

“…The flow in tight rod bundles is characterized by long-term, large-scale coherent patterns in the stream-wise direction. In the present work, the issue of…”
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Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet by Yu, Y.Q., Merzari, E., Thomas, J.W., Obabko, A., Aithal, S.M.

“…•Both steady (RANS) and unsteady (URANS, LES) methods were applied to study thermal striping.•The unsteady results exhibited reasonably good agreement with…”
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Analysis of low Reynolds number turbulent flow phenomena in nuclear fuel pin subassemblies of tight lattice configuration by Ninokata, H., Merzari, E., Khakim, A.

“…This paper focuses on the numerical simulation of low Reynolds (Re) number turbulence flow phenomena in tightly packed fuel pin subassemblies and in channels…”
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Direct numerical simulation of a pressurized thermal shock scenario at higher reynolds number by Mathur, A., Kraus, A., Merzari, E., Komen, E.M.J.

“…•DNS presented for pressurized thermal shock scenario in a reactor downcomer geometry.•Detailed statistics for flow including anisotropy and turbulent kinetic…”
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Toward development of a low-temperature failure envelope of cases for high-burnup RIAs under PWR operational conditions by Aldeia Machado, L., Nantes, K., Merzari, E., Charlot, L., Motta, A., Walters, W.

“…A Reactivity-Initiated Accident (RIA) is a design-basis accident that occurs when the reactor loses one of its control rods. A reactivity insertion will follow…”
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Status, perspectives, and added value of high fidelity simulations for safety and design by Komen, E.M.J., Mathur, A., Roelofs, F., Merzari, E., Tiselj, I.

“…With the increase in computational power, High Fidelity (HiFi) simulations become increasingly important to nuclear thermal hydraulics for fundamental…”
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A novel numerical treatment of the near-wall regions in the k−ω class of RANS models by Tomboulides, A., Aithal, S.M., Fischer, P.F., Merzari, E., Obabko, A.V., Shaver, D.R.

“…•Proposed a novel numerical treatment for properly handling the unbound behavior of ω at solid walls.•Developed, implemented and tested an approach for the k−ω…”
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Coupled Monte Carlo and thermal-fluid modeling of high temperature gas reactors using Cardinal by Novak, A.J., Andrs, D., Shriwise, P., Fang, J., Yuan, H., Shaver, D., Merzari, E., Romano, P.K., Martineau, R.C.

“…Cardinal is an open-source application that couples OpenMC Monte Carlo transport and NekRS computational fluid dynamics to the Multiphysics Object-Oriented…”
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Comparison of experimental and simulation results on interior subchannels of a 61-pin wire-wrapped hexagonal fuel bundle by Goth, N., Jones, P., Nguyen, D.T., Vaghetto, R., Hassan, Y.A., Obabko, A., Merzari, E., Fischer, P.F.

“…•Motivation of sodium fast reactor research presented.•Discussion of experimental facility and measurement methodology.•Discussion of computational…”
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Coupled Monte Carlo and thermal-fluid modeling of high temperature gas reactors using Cardinal by Novak, A. J., Andrs, D., Shriwise, P., Fang, J., Yuan, H., Shaver, D., Merzari, E., Romano, P. K., Martineau, R. C.

“…Cardinal is an open-source application that couples OpenMC Monte Carlo transport and NekRS computa-tional fluid dynamics to the Multiphysics Object-Oriented…”
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Multiphysics for nuclear energy applications using a cohesive computational framework by Martineau, R., Andrs, D., Carlsen, R., Gaston, D., Hansel, J., Kong, F., Lindsay, A., Permann, C., Slaughter, A., Merzari, E., Hu, Rui, Novak, A., Slaybaugh, R.

“…With the recent development of advanced numerical algorithms, software design, and low-cost high-performance computer hardware, reliance on coupled…”
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Proper orthogonal decomposition of the flow in a tight lattice rod-bundle: 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) by MERZARI, E, NINOKATA, H

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Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet by Yu, Y. Q., Merzari, E., Thomas, J. W., Obabko, A., Aithal, S. M.

“…The phenomenon of thermal striping is encountered in liquid metal cooled fast reactors (LMFR), in which temperature fluctuation due to convective mixing…”
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