Largeeddy simulations of turbulent flow for gridtorod fretting in nuclear reactors
Abstract
The gridtorod fretting (GTRF) problem in pressurized water reactors is a flowinduced vibration problem that results in wear and failure of the fuel rods in nuclear assemblies. In order to understand the fluid dynamics of GTRF and to build an archival database of turbulence statistics for various configurations, implicit largeeddy simulations of timedependent singlephase turbulent flow have been performed in 3 × 3 and 5 × 5 rod bundles with a single grid spacer. To assess the computational mesh and resolution requirements, a method for quantitative assessment of unstructured meshes with noslip walls is described. The calculations have been carried out using HydraTH, a thermalhydraulics code developed at Los Alamos for the Consortium for Advanced Simulation of Light water reactors, a United States Department of Energy Innovation Hub. HydraTH uses a secondorder implicit incremental projection method to solve the singlephase incompressible NavierStokes equations. The simulations explicitly resolve the large scale motions of the turbulent flow field using first principles and rely on a monotonicitypreserving numerical technique to represent the unresolved scales. Each series of simulations for the 3 × 3 and 5 × 5 rodbundle geometries is an analysis of the flow field statistics combined with a meshrefinement study andmore »
 Authors:

 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Idaho National Lab. (INL), Idaho Falls, ID (United States)
 Publication Date:
 Research Org.:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1233158
 Report Number(s):
 LAUR1226572
Journal ID: ISSN 00295493; PII: S0029549313003129
 Grant/Contract Number:
 AC5206NA25396
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Engineering and Design
 Additional Journal Information:
 Journal Volume: 262; Journal Issue: C; Journal ID: ISSN 00295493
 Publisher:
 Elsevier
 Country of Publication:
 United States
 Language:
 English
 Subject:
 97 MATHEMATICS AND COMPUTING; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
Citation Formats
Bakosi, J., Christon, M. A., Lowrie, R. B., PritchettSheats, L. A., and Nourgaliev, R. R. Largeeddy simulations of turbulent flow for gridtorod fretting in nuclear reactors. United States: N. p., 2013.
Web. doi:10.1016/j.nucengdes.2013.06.007.
Bakosi, J., Christon, M. A., Lowrie, R. B., PritchettSheats, L. A., & Nourgaliev, R. R. Largeeddy simulations of turbulent flow for gridtorod fretting in nuclear reactors. United States. doi:10.1016/j.nucengdes.2013.06.007.
Bakosi, J., Christon, M. A., Lowrie, R. B., PritchettSheats, L. A., and Nourgaliev, R. R. Fri .
"Largeeddy simulations of turbulent flow for gridtorod fretting in nuclear reactors". United States. doi:10.1016/j.nucengdes.2013.06.007. https://www.osti.gov/servlets/purl/1233158.
@article{osti_1233158,
title = {Largeeddy simulations of turbulent flow for gridtorod fretting in nuclear reactors},
author = {Bakosi, J. and Christon, M. A. and Lowrie, R. B. and PritchettSheats, L. A. and Nourgaliev, R. R.},
abstractNote = {The gridtorod fretting (GTRF) problem in pressurized water reactors is a flowinduced vibration problem that results in wear and failure of the fuel rods in nuclear assemblies. In order to understand the fluid dynamics of GTRF and to build an archival database of turbulence statistics for various configurations, implicit largeeddy simulations of timedependent singlephase turbulent flow have been performed in 3 × 3 and 5 × 5 rod bundles with a single grid spacer. To assess the computational mesh and resolution requirements, a method for quantitative assessment of unstructured meshes with noslip walls is described. The calculations have been carried out using HydraTH, a thermalhydraulics code developed at Los Alamos for the Consortium for Advanced Simulation of Light water reactors, a United States Department of Energy Innovation Hub. HydraTH uses a secondorder implicit incremental projection method to solve the singlephase incompressible NavierStokes equations. The simulations explicitly resolve the large scale motions of the turbulent flow field using first principles and rely on a monotonicitypreserving numerical technique to represent the unresolved scales. Each series of simulations for the 3 × 3 and 5 × 5 rodbundle geometries is an analysis of the flow field statistics combined with a meshrefinement study and validation with available experimental data. Our primary focus is the time history and statistics of the forces loading the fuel rods. These hydrodynamic forces are believed to be the key player resulting in rod vibration and GTRF wear, one of the leading causes for leaking nuclear fuel which costs power utilities millions of dollars in preventive measures. As a result, we demonstrate that implicit largeeddy simulation of rodbundle flows is a viable way to calculate the excitation forces for the GTRF problem.},
doi = {10.1016/j.nucengdes.2013.06.007},
journal = {Nuclear Engineering and Design},
number = C,
volume = 262,
place = {United States},
year = {2013},
month = {7}
}
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