Experimental Determination of Fluid-Coupling Coefficients in an Array of Hexagonal Prisms

by André Preumont, Belgonucleaire, Brussels, Belg, Belgonucleaire, Brussels, Belg,
José Parent, Belgonucleaire, Brussels, Belg, Belgonucleaire, Brussels, Belg,

Abstract: The problem is related to the seismic analysis of fast breeder reactor cores, where the fluid trapped between the subassemblies is known to have a considerable influence on the core response. The paper describes an experiment on a simple geometry which is representative of an actual LMFBR core. Experimental added mass coefficients are determined for various values of the gap, and compared with Finite Element results. The damping contribution is also analysed. The results indicate that experimental added mass coefficients are consistent with numerical estimations obtained with a plane model and a perfect fluid. The plane model, however, overestimates the coefficients by about 20%, which can be attributed to tridimensional effects in the tests. Experimental results indicate that the fluid damping cross terms are very small and that the damping ratio increases sharply as the gap decreases.

Subject Headings: Damping | Drag (fluid dynamics) | Fluid-structure interaction | Seismic tests | Seismic effects | Model tests | Geometrics | Finite element method

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