Unsteady flow loading of fuel assemblies in Pressurised Water Reactors power plants is a potential cause of deformation and of fretting wear damage. Inside a fuel assembly, rods are arranged in 17 × 17 bundles. The rod diameter is equal to about 9 mm, and the gap between two rods is equal to about 2 mm. Each rod is several meters long, and mixing grids are arranged every 0.4 m. The axial flow velocity is equal to about 5 m/s, so that the Reynolds number reaches 5 × 105 in the reactor configuration. Due to the complexity of the turbulent flow pattern, an accurate description of the fluid-structure interaction is still a challenging task, and only a few data about this issue are available today in literature. Recent Computational Fluid Dynamics results are revisited from the point of view of classical axial turbulence-induced vibrations. The unsteady pressure force Power Spectral Densities are determined, a convective velocity is derived, and an estimation of the axial correlation length for the pressure force is given. The results agree reasonably well with the scientific literature.
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ASME 2011 Pressure Vessels and Piping Conference
July 17–21, 2011
Baltimore, Maryland, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4454-0
PROCEEDINGS PAPER
CFD Estimation of the Unsteady Fluid Force Along a Fuel Rod Downstream a Mixing Grid Available to Purchase
P. Moussou,
P. Moussou
LaMSID, UMR CNRS EDF, Clamart, France
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S. Benhamadouche,
S. Benhamadouche
EDF R&D, Chatou, France
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Ch. Bodel
Ch. Bodel
EDF R&D, Clamart, France
Search for other works by this author on:
P. Moussou
LaMSID, UMR CNRS EDF, Clamart, France
S. Benhamadouche
EDF R&D, Chatou, France
Ch. Bodel
EDF R&D, Clamart, France
Paper No:
PVP2011-57337, pp. 251-259; 9 pages
Published Online:
May 21, 2012
Citation
Moussou, P, Benhamadouche, S, & Bodel, C. "CFD Estimation of the Unsteady Fluid Force Along a Fuel Rod Downstream a Mixing Grid." Proceedings of the ASME 2011 Pressure Vessels and Piping Conference. Volume 4: Fluid-Structure Interaction. Baltimore, Maryland, USA. July 17–21, 2011. pp. 251-259. ASME. https://doi.org/10.1115/PVP2011-57337
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