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Research Papers: Flows in Complex Systems

Numerical Simulation of Flow Through Nuclear Fuel Bundles With Angular Misalignments

[+] Author and Article Information
A. Bhattacharya

 Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada

S. D. Yu1

 Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canadasyu@ryerson.ca

1

Corresponding author.

J. Fluids Eng 134(11), 111101 (Oct 23, 2012) (15 pages) doi:10.1115/1.4007688 History: Received August 22, 2011; Revised September 13, 2012; Published October 23, 2012

Comprehensive computational fluid dynamics (CFD) models are developed and analyzed in this paper to study the three-dimensional flow through simulated nuclear fuel bundles with angular misalignments inside a pressure tube. The large eddy simulation (LES) scheme is employed to solve the large scale complex computational models with an aim to understanding the effects of the bundle-to-bundle angular misalignments on unsteady flow and flow-induced excitations on the fuel bundle structures. The proposed numerical scheme is validated with both numerical and experimental work available in the literature. Numerical results obtained from the current computational models indicate the presence of significant lateral or cross-flow in the bundle-to-bundle interface region for bundles with angular misalignments. The mean and the rms values of the lateral fluid excitations on the first bundle are found to be sensitive with respect to the change in angular misalignments between bundles.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Fuel channel with flow direction, string of fuel bundles, and zone for computational modeling indicated

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Figure 2

Combined configuration of endplate and fuel-element with angular misalignment shown

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Figure 3

(a) Illustration of bundle subchannels with element numbering scheme adopted; (b) side view of an endplate with its components for a 37-element fuel bundle and points of interests considered for numerical analysis

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Figure 4

Entire computational domain with boundary condition indicated

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Figure 5

Illustration of meshing scheme

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Figure 6

Exploded view of the domain and boundary meshes for selected bundle and endplate subchannels in a cross section

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Figure 11

Contours of y-velocity normalized by corresponding mean axial flow velocity at different axial locations for mean flow velocity of 2.4 m/s

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Figure 12

Contours of x-velocity normalized by corresponding mean axial flow velocity at different axial locations for mean flow velocity of 2.4 m/s

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Figure 13

Contours of tangential velocity normalized by corresponding mean axial flow velocity at different axial locations for mean flow velocity of 2.4 m/s

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Figure 14

Contours of radial velocity normalized by corresponding mean axial flow velocity at different axial locations for mean flow velocity of 2.4 m/s

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Figure 15

Time histories and PSDs of x-force (side force) and y-force (lift force) for the first bundle for mean flow velocities of 2.4 m/s and 4.8 m/s

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Figure 16

Pathlines showing development of fluid flow with sources indicated by black dots when viewed from downstream side for aligned interface

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Figure 17

Pathlines showing development of fluid flow with sources indicated by black dots when viewed from downstream side for misaligned interface

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Figure 20

Plots of mean (a) and rms (b) values for x and y-force on the first bundle at different misalignments

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Figure 19

Comparison of x-force and y-force for aligned and misaligned interfaces

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Figure 18

In-plane velocity vectors (scale 20X) at locations before and after the interface

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Figure 10

Different angular misalignment configurations with 5 deg increment

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Figure 9

Comparison of axial velocity contours around a middle-ring element for the present simulation (a) with the measurement performed by D’Arcy and Schenk (b) [19]

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Figure 8

Normalized time-averaged streamwise velocity (U/Umax ) around the middle outer element

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Figure 7

Normalized time-averaged streamwise velocity (U/Umax ) around the middle outer element with plots from various models used in grid study

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