تاثير نانو ذرات بر رفتار ارتعاشي مجتمع سوخت در جريان محوري سيال

This study numerically investigates an‎d models the vibration of a fuel rod induced by fluid flow. The rod under consideration is a cylindrical fuel rod subjected to turbulent axial flow. To solve such problems, a two-way fluid–structure interaction (FSI) is examined using a partitioned method with strong external coupling. Iterations between the separate fluid an‎d structure solvers are continued until convergence is achieved. The exchange of force an‎d displacement between the fluid an‎d structural modules is enabled through the moving mesh condition at the fluid–structure interface. The results are validated an‎d show good agreement with both simulated an‎d experimental rod data under similar conditions, with the vibration frequency reproduced accurately. As an innovation in this thesis, the effect of nanofluids on fuel rod vibration is investigated. Furthermore, by considering the influence of the retaining lattice an‎d applying symmetrical boundary conditions for the rod in a fluid with a hexagonal cross-section, simulations were performed to extract displacement an‎d vibration frequency. According to the literature reviewed, no prior study has addressed the effect of nanofluids on fuel rod vibrations. In this thesis, titanium oxide nanoparticles with varying concentrations are added to the coolant to produce nanofluids. The vibration behavior of the fuel assembly in the presence of nanofluids is numerically simulated an‎d analyzed using ANSYS version 23 software.

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