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Tesi etd-01272015-153557


Thesis type
Tesi di laurea magistrale
Author
ARTINI, GIANLUCA
URN
etd-01272015-153557
Title
Numerical and Experimental Analysis of a FSI Model for a FBR Core: Edge Effects
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA NUCLEARE
Commissione
relatore Prof. Ambrosini, Walter
relatore Prof. Forgione, Nicola
relatore Dott. Magnaud, Jean-Paul
relatore Dott. Sargentini, Lucia
Parole chiave
  • vibrations
  • Cast3M
  • SFR
  • hexagonal
  • FSI
  • Phénix
  • Euler equations
Data inizio appello
02/03/2015;
Consultabilità
completa
Riassunto analitico
The work focuses on the fluid flow three-dimensional effects during bidimensional<br>oscillation in narrow gaps, as the Phénix core or a SFR core.<br>For investigating this particular behavior two different approaches are used:<br>an experimental approach and a numerical one.<br>The numerical approach used for evaluating the edge effects is an analysis<br>with the Cast3M &#34;upphi&#34; code. The &#34;upphi&#34; model utilizes the Euler linearized<br>equation coupled with the spring-mass dynamic equation. This model is<br>used for representing the experimental facility PISE-1a, in order to analyze<br>the three dimensional behavior and the effects on the oscillating structure.<br>The experimental approach lies on the exploitation of two experimental<br>facility developed and manufactured by the cea of Saclay: the test-rig<br>PISE-1a and the small test facility PISE-2c, a hexagonal mono-assembly facility<br>and a two crowns of hexagonal assemblies respectively. The aim of the<br>design of those experimental facility is to reproduce the inertial effects of<br>the Phénix core assemblies. The three dimensional fluid flow (called “jambages”)<br>establishes itself in the inter assemblage space. This fluid behavior<br>is confirmed by some piv visualitation on PISE-1a. The effects on the structure<br>is a lower frequency vibration respect to the frequency evaluated by the<br>analytical bi-dimensional models.<br>Another part of the work concerns the setup of the small scale test<br>facility PISE-2c with the calibration and the characterization of its elements<br>for starting the new experimental campaign.<br>The present thesis work has been carried out during an internship at the<br>CEA of Saclay (Paris, France).
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