Direct Numerical Simulation of Pebble Bed Flows: Database Development and Investigation of Low-Frequency Temporal Instabilities

Fick, Lambert H.; Merzari, Elia; Hassan, Yassin A.

doi:10.1115/1.4035300

Title: Direct Numerical Simulation of Pebble Bed Flows: Database Development and Investigation of Low-Frequency Temporal Instabilities

Journal Article · Mon Feb 20 00:00:00 EST 2017 · Journal of Fluids Engineering

DOI:https://doi.org/10.1115/1.4035300· OSTI ID:1372395

Fick, Lambert H. ^[1]; Merzari, Elia ^[2]; Hassan, Yassin A. ^[1]

Texas A & M Univ., College Station, TX (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

Computational analyses of fluid flow through packed pebble bed domains using the Reynolds-averaged NavierStokes framework have had limited success in the past. Because of a lack of high-fidelity experimental or computational data, optimization of Reynolds-averaged closure models for these geometries has not been extensively developed. In the present study, direct numerical simulation was employed to develop a high-fidelity database that can be used for optimizing Reynolds-averaged closure models for pebble bed flows. A face-centered cubic domain with periodic boundaries was used. Flow was simulated at a Reynolds number of 9308 and cross-verified by using available quasi-DNS data. During the simulations, low-frequency instability modes were observed that affected the stationary solution. Furthermore, these instabilities were investigated by using the method of proper orthogonal decomposition, and a correlation was found between the time-dependent asymmetry of the averaged velocity profile data and the behavior of the highest energy eigenmodes.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1372395

Journal Information:: Journal of Fluids Engineering, Vol. 139, Issue 5; ISSN 0098-2202

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Direct Numerical Simulation and Wall-Resolved Large Eddy Simulation in Nuclear Thermal Hydraulics Tiselj, Iztok; Flageul, Cedric; Oder, Jure Nuclear Technology, Vol. 206, Issue 2 https://doi.org/10.1080/00295450.2019.1614381	journal	June 2019
Interface Tracking Investigation of Geometric Effects on the Bubbly Flow in PWR Subchannels Fang, Jun; Cambareri, Joseph J.; Rasquin, Michel Nuclear Science and Engineering, Vol. 193, Issue 1-2 https://doi.org/10.1080/00295639.2018.1499280	journal	August 2018

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