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Research Papers

Numerical Study of Fluid–Structure Interaction With Heat Transfer at Supercritical Pressure in a Fuel Rod Assembly

[+] Author and Article Information
Maximilian Hartig

Institute for Nuclear and Energy Technology, Karlsruhe Institute of Technology,
Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
e-mail: maximilian.hartig@kit.edu

Thomas Schulenberg

Institute for Nuclear and Energy Technology, Karlsruhe Institute of Technology,
Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
e-mail: thomas.schulenberg@kit.edu

Abdalla Batta

Institute for Nuclear and Energy Technology, Karlsruhe Institute of Technology,
Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
e-mail: abdalla.batta@kit.edu

1Corresponding author.

Manuscript received April 15, 2015; final manuscript received October 12, 2015; published online December 9, 2015. Assoc. Editor: Igor Pioro.

ASME J of Nuclear Rad Sci 2(1), 011013 (Dec 09, 2015) (12 pages) Paper No: NERS-15-1059; doi: 10.1115/1.4031816 History: Received April 15, 2015

Irregular temperature profiles inside nuclear reactors cause the deformation of fuel rods. Due to difficulties in implementing this phenomenon, it is usually neglected in computational fluid dynamics (CFD) analyses. Thermoelasticity effect was analyzed in this study for a 7-rod test fuel assembly. The overall problem was simplified on both the fluid-dynamical and the structural side. Existing technology is capable of executing such analysis; although for reliable results, improvement in the mesh deformation algorithm is needed. The deflection proves to have a distinct impact on surface temperature in a limited area. To obtain reliable results, more thorough analysis regarding both domains is necessary.

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References

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Figures

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Fig. 2

Cross-sectional view of the flow channel

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Fig. 3

Cross-sectional view of a heating rod

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Fig. 4

Cross-sectional view of the reduced geometry for the numerical analysis

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Fig. 5

Positions of the modeled spacers in the reduced geometry

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Fig. 6

Linear FSI coupling scheme

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Fig. 7

Reduced geometry of the numerical analysis of the problem. The solid color indicates the structural domain while the fluid domain is represented in transparent.

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Fig. 8

Mesh for the structural domain. Regularly mapped on the domain interface, irregular mesh inside the structural domain.

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Fig. 9

Mesh used for the k-ϵ analysis

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Fig. 10

Mesh for the k-ω SST analysis

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Fig. 11

Positions of the monitor lines in the numerical model geometry

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Fig. 12

Development of temperatures over channel length at monitor point positions for the analysis without consideration CHT or FSI, case 1

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Fig. 13

Outer wall temperature on rod B in K over the circumference for case 1 at 1325 mm axial position

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Fig. 14

Outer wall temperature on rod B in K over the circumference for case 1 at 1625 mm axial position

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Fig. 15

Surface temperatures of the heating rods near the outlet of the computational domain

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Fig. 16

Development of temperatures over channel length at monitor point positions for the analysis including CHT, case 2

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Fig. 17

Temperature difference between case 2 and case 1. Negative values designate lower temperatures for case 2 in respect to case 1

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Fig. 18

Outer wall temperatures on rod B in K over the circumference for cases 1 and 2 at an axial position of 1325 mm

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Fig. 19

Outer wall temperatures on rod B in K over the circumference for cases 1 and 2 at an axial position of 1625 mm

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Fig. 20

Cross-sectional temperature profile for analysis including CHT at 1625 mm

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Fig. 21

Deformation of the heating rod B scaled by a factor of 20, assuming temperatures of case 2

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Fig. 22

Total mesh displacement in radial direction

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Fig. 23

Thermally induced stress on the rods

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Fig. 24

Development of temperatures over channel length at monitor point positions for the analysis including deflection of the rods, case 3. Line LC is overlapping with line B1

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Fig. 25

Outer wall temperature on rod B in K over the circumferential position for cases 2 and 3 at an axial position of 1325 mm

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Fig. 26

Outer wall temperature on rod B in K over the circumferential position for cases 2 and 3 at an axial position of 1625 mm

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Fig. 27

Wall temperatures on rod A and B for case 3. View on the outlet section

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Fig. 28

Development of temperatures over channel length at monitor point positions for the k-ω-SST analysis, case 4

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Fig. 29

Differences in wall temperatures between cases 2 and 3. Negative values designate a lower temperature of case 3 in respect to case 2

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Fig. 30

Outer wall temperature on rod B in K over the circumferential position for cases 1 and 4 at an axial position of 1325 mm

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Fig. 31

Outer wall temperature on rod B in K over the circumferential position for cases 1 and 4 at an axial position of 1625 mm

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Fig. 32

Cross-sectional temperature profile for the k-ω-SST analysis at 1625 mm

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