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Predicting Large Deflections of Multiplate Fuel Elements Using a Monolithic FSI Approach

by Franklin G Curtis, James D Freels, Kivanc Ekici
Publication Type
Journal Name
Nuclear Science and Engineering
Publication Date
Page Numbers
82 to 92

As part of the Global Threat Reduction Initiative (GTRI)the High Flux Isotope Reactor (HFIR) is converting itsfuel from high-enriched uranium to low-enriched uranium.Currently, multi-physics simulations that model fluid-structureinteraction (FSI) phenomena are being performed to ensure thesafety of the reactor with the new fuel type. A monolithicsolver that fully couples fluid and structural dynamics is usedto model deflections in the new design. A classical experimentis chosen to validate the capabilities of the current solver andthe method. A single plate simulation with various boundaryconditions as well as a 5-plate simulation are presented. Useof the monolithic solver provides stable solutions for the largedeflections and the tight coupling of the fluid and structure and the maximum deflections are captured accurately.