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Experimental and Numerical Analysis for Fluid-Structure Interaction for an Enclosed Hexagonal Assembly

[+] Author Affiliations
Lucia Sargentini, Benjamin Cariteau

CEA Saclay, Gif-sur-Yvette, France

Morena Angelucci

University of Pisa, Pisa, Italy

Paper No. PVP2014-28053, pp. V005T11A002; 10 pages
doi:10.1115/PVP2014-28053
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4602-5
  • Copyright © 2014 by ASME

abstract

This paper is related to fluid-structure interaction analysis of sodium cooled fast reactors core (Na-FBR). Sudden liquid evacuation between assemblies could lead to overall core movements (flowering and compaction) causing variations of core reactivity. The comprehension of the structure behavior during the evacuation could improve the knowledge about some SCRAMs for negative reactivity occurred in PHÉNIX reactor and could contribute on the study of the dynamic behavior of a FBR core. An experimental facility (PISE-2c) is designed composed by a Poly-methyl methacrylate hexagonal rods (2D-plan similitude with PHÉNIX assembly) with a very thin gap between assemblies. Another experimental device (PISE-1a) is designed and composed by a single hexagonal rod for testing the dynamic characteristics. Different experiments are envisaged: free vibrations and oscillations during water injection.

A phenomenological analysis is reported showing the flow behavior in the gap and the structure response. Also computational simulations are presented in this paper. An efficient numerical method is used to solve Navier-Stokes equations coupled with structure dynamic equation. The numerical method is verified by the comparison of analytic models and experiments.

Copyright © 2014 by ASME

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